IH: Electrical System

SWITCHES

Keyswitch

Subdocuments


The Keyswitch is fed from the main Circuit Breaker. Typically, this feed wire is RED. The Keyswitch has two positions (besides OFF).

There is a RUN position & a LIGHTS position. This allows the lights to be off for starting (especially kick starting) but then can be turned on by moving the keyswitch to the second on position. But sometime in the late 70's, the MoCo began putting a shorting wire across both output connections of the Keyswitch. This meant that all the circuits are powered whenever the Keyswitch is ON, so that the lights are guaranteed to be on (basically making the keyswitch simply an ON/OFF switch). The Keyswitch labels were likely to be B - IG - L for Battery, Ignition & Lights.


Brake Switch

Front and Rear Brake Switches
Year ModelPositionSwitch Part#AdditionalYear ModelPositionSwitch Part#Additional
1959-1966Rear72004-52Complete1973-1981Front72001-69BSwitch only
1967-1972Rear72004-67Kit with wires1977-1978Rear
L1969-1972Front71900-70Includes terminal1979-1985Rear72023-51ASwitch only
1973-1974Rear72004-70Switch only1982-1985Front71574-82Includes terminal
and wiring
1975-1976Rear72004-75Switch only

The stock 77 rear brake light switch is a cheesy little thing that attaches to the pressed metal inner sprocket cover/brake cable mounting plate under the aluminum sprocket cover. 1) They are tiny and often get clogged up with chain gunk in there. The little flat plate sticking out from the end of the cable operates it. It mounts on a right angle metal bracket going to the quarter nut and stud above, allowing adjusment.

Rear Brake Switch (72001-69B) on 1977 XLCH.
2)

INSTRUMENTS

Sub Documents

Speedometers

All Ironhead Sportster speedos, whether tranny driven or front wheel driven, are 2:1 ratio.
1957-72 - Transmission Driven - 2:1 Ratio Speedometers
1973-83 - 19“ Wheel Driven Right Side - 2:1 Ratio Speedometers 3)
1984-85 - 19” Wheel Driven Left Side - 2:1 Ratio Speedometers
. Driven Unit = 67127-84A for use with 2:1 Speedometers - (CableRPM-2000=60mphOnSpeedo)

MPH Speedometers KPH Speedometers
Part#Year ModelNotesPart#Year ModelNotes
67007-521952-1954 K Models120 MPH67008-521952-1956 K Models
1957-1958 Sportsters
(except XLC/XLCH)
KPH
67007-54
6007-54A
1955-1956 KH
1957-1958 Sportster
(except XLC/XLCH)
120 MPH67008-521952-1956 K Models
1957-1958 Sportsters
(except XLC/XLCH)
KPH
67007-591959-1964 Sportsters120 MPH67008-591959-1967 Sportsters
(except XLCH initially)
KPH
67007-59A1965-E1967 Sportsters120 MPH67008-59A1959-1968 SportstersKPH.
New part# in 1968 retrofit
67007-59BL1967-E1969 Sportsters150 MPH67008-59B1959-1969 SportstersKPH
67007-59CL1969 Sportsters150 MPH67008-701970 SportstersKPH
67007-701970 Sportsters150 MPH67021-701970-1972 SportstersKPH
67020-701970-1972 Sportsters150 MPH67021-731973 SportstersKPH
67020-731973 Sportsters150 MPH67021-73A1973 SportstersKPH
update in 1976
67020-741974 Sportsters150 MPH67043-741974 SportstersKPH
67020-74A1975-1976 Sportsters150 MPH
update retros to 1974
67043-74A1975-1976 SportstersKPH
update retros to 1974
67020-74B1977-1979 Sportsters150 MPH
update retros to 1974
67043-74B1977-1979 SportstersKPH
update retros to 1974
67007-791979 XLSMPH67043-75B1980-1981 XL
1981 XLS
KPH
67007-79A1980 XLSMPH, w/ bracket
replaced 670079 in 1980
67043-75C1982-1983 XL
1982 XLS
KPH
supercedes 67043-75B
67020-75D1980-1983 XL
1981-1982 XLS
85 MPH67008-791979 XLSKPH, w/ bracket
67016-831983 XLS
1983-1984 XLX
85 MPH, complete67008-79A1980 XLSKPH
67037-83E1984 XLMPH, w/ wiring67010-831983 XLS
1983-1985 XLX
KPH, complete
67061-831984 XLSMPH, w/wiring67062-83L1983-1985 XLX
1984-1985 XLS
KPH, w/wiring
67100-831983-1984 XLSMPH, complete67101-831983-1985 XLSKPH, complete
67016-851985 XLXMPH, complete
67037-851985 XLMPH, w/ wiring
67061-851985 XLS/XLXMPH, w/wiring
67100-851985 XLSMPH, complete
67037-85AL1984-1985 XL
1985 XLS/XLX
120 MPH, w/ wiring

Speedometer Drive Gear (1952-1972)

The mechanical speedometer on K Models / XLH from 1952-1972 and XLCH from 1959-1972 is run by a (11T) gear unit attached to the transmission.
This was not used on 1958 XLC or XLCH.
4) 5)

The speedometer drive unit goes into the hole in the lower right side of the transmission beside the oil pump.
The pic on the right shows the drive unit as installed from the inside.
6) 7) 8)


Staring down a problem with the speedometer not working can be catastrophic when visualizing the possible causes and particularly the effects thereof.
Also, if you're not going to use the OEM speedo drive, then remove it and plug the hole. That freewheeling drive has been known to destroy the trans and engine case. 9)
Just unscrew it and screw in a plug. Colony makes a Speedometer Drive Block-Off Plug (2057-2) for K Models and XLs.

This..Yields that….This particular incident luckily didn't hurt any engine parts
Broken teeth on bent speedo drive unit 10)Metal pieces in case behind trap door 11)Busted teeth on tranny 12)

Speedometer Drive Gear (1973)

The speedometer drive unit was moved to the front wheel, right side, in 1973. 1970-1973 XLH, XLCH used Veglia (Italian made) instruments.
And the 73 drive unit (67127-73) was also from Veglia. In 1974, the MoCo started using Nippon Seiki (Japan) gauges and drive units.
The new drive unit didn't have the grease fitting as did the 73 unit but has the same part number as in 73, and retrofitting to 73 models for replacement.

13) 14) 15)

Speedometer Hole Plug (1958-1972 XLCH)

There is a 11/16“x20 hex head hole plug (24575-52) for 1958-1972 XLCH's not running a speedometer.
It gets installed in place of the speedometer drive gear unit in the lower rear of the right case.
16)

Tachometers

The first mention of a tach used on a Sportster is the L1962 XLCH per the -63 parts catalog.
Several tach kits were sold in 1965 for current and prior model XLH models per the -66 parts catalog supplement.

Year Model Tach Notes
L1962- XLCH92051-62Part of Tach Kit (92050-62) mounted on handlebars. (Smith)
1962-1964 XLCH92051-65Part of Tach Conversion Kit (92050-62A), replaces (92051-62)
1965-1966 XLCH92051-65Part of Tach Kit (92058-59) mounts speedometer and tach to forks on 1959-1965 XLCH
1967-1969 XLCH92051-65Part of Tach Kit (92057-67)
1957-1964 XLH92051-65Part of retro Tach Kit (92049-57) in 1963
E1965 XLH92051-62Part of Tach Kit (92049-65)
92051-62AReplaced 92051-62 with Tach Kit (92050-62A)
L1965-1966 XLH92051-65Part of Tach Kit (92049-65A)
1967-1969 XLH92051-65Part of Tach Kit (92048-67)
1970 XLH/XLCH92059-70Part of Tach Kit (92048-70). Made by Veglia (Italy)
1971-1973 XLH/XLCH92051-70Part of Tach Kit (92048-71) Made by Veglia (Italy)
1974 XLH/XLCH92051-74Made by Nippon Seiki (Japan)
1975-1976 XLH/XLCH92051-74ARetro to 1974. Made by Nippon Seiki (Japan)
1977-1979 XLH/XLCH92051-74BRetro to 1974. Replaced by 92051-75D. Made by Nippon Seiki (Japan)
1979 XLS92053-79With bracket. Replaced by 92053-79A. Made by Nippon Seiki (Japan)
1980 XL92051-75DWith bracket. Made by Nippon Seiki (Japan)
1980 XLS92053-79AWith bracket. Supersedes 92053-79. Made by Nippon Seiki (Japan)
1981-1982 XL/XLS92051-81Electronic. Replaced by 92051-81A. Made by Nippon Seiki (Japan)
1983 XL92051-81AElectronic. Replaced 92051-81. Made by Nippon Seiki (Japan)
1983-1984 XLS92060-83Electronic, complete w/ bracket
1983 XLS92059-83Electronic, w / bulb and socket
1983 XLS92060-83Electronic, complete
E1984 XL67111-83Speedometer and Elect Tach Kit (67099-84)
L1984-1985 XL67111-85Speedometer and Elect Tach Kit (67099-85)
1985 XLS92059-85Electronic, w / bulb and socket
1985 XLS92060-85Electronic, complete w/ bracket

Tach Drive Gear (1971-1980)

The tach drive gear unit (92097-71) for 71-80 models screws into the cam cover between #3 and #4 cams.
A worm type gear is pressed onto #4 cam that drives the tach drive gear unit. Both gears on the cam and tach drive have 11 teeth.
So there is a 1:1 ratio between these two gears.
However, the cam turns 1 revolution per every 2 TDC revolutions of the front piston leaving a 2:1 ratio at the tachometer head.
The drive unit gets a washer gasket (67142-52) on top for the threaded coupler on the cable connecting the drive unit to the tach head.

17) 18)

19) 20) 21)

Tach Hole Plug

If you are not using the tach, you can remove the drive unit and plug the hole.

L1962-1969 XLCH tach plug (92077-62) is used to plug the hole at the magneto.
The plug is pushed into the hole and it has an O-ring (11110) on the end.


1971-E1984 Sportsters can use the Colony plug below to plug the hole in the cam cover.
Just unscrew the drive and screw in the plug (with seal washer).
22) 23)

24) 25)

Misc Gauges

HD Head Temperature Gauges

Head Temp Gauge (75002-69) became available through the -70 Sportster parts catalog (among other models) as part of Kit# (75000-69) and also sold by itself.
Made for +12V systems from 1965-1976.
The gauge signal comes from a sending unit (75005-69) attached to the front head with a thin nut (7692) and wired with a cable assembly (75003-69).
The gauge sits inside a handlebar mounted bullet style housing (74479-68) with a bezel (74472-68).
The assembly mounts to the handlebar with mounting bracket (74484-68) and handlebar clamp (45030-65A).

Head Temp Gauge (75002-77) was for use on 1977-1981 Sportsters. It has an illuminated face and measures temps 200-500F (95-260C).
Per IronMick, to install the sending unit for the gauge, you drill a hole in the top fin of the front cylinder head (left side). 26)
Then insert the threaded part of the sender into the hole. The special nut is thin enough to fit between the two fins.

27) 28)

Volt Meter

1977-1978 XLH, XLCH got a volt meter (74432-77). The part number was updated in the -78B parts catalog to (74432-77A).
It has a black face, is app. 2” in diameter, 2.3“ wide bezel, 2” long and reads +10 to +16 volts.

29) 30) 31)


LIGHTS


Headlight

In Late 1977, Shorter Headlight Bracket Mounting Bolts Used

  • In late 1977, shorter bolts were used to mount the headlight bracket to allow it to be installed or removed with the handlebars clamped in place. The shorter bolt also allows for the mounting of the headlight bracket after mounting the speedometer / tachometer bracket underneath the handlebar upper clamp which provides easy access to the wiring connections at the headlight terminal block.
  • The shorter bolts 5/16“x18 1-1/8” (43868-72) replaced the longer 5/16“x18 1-1/4” bolts (2871W). The longer bolts can also be shortened for this application. 32)

Tail Light - License Light


Turn Signals

(1973-85 Simple Turn Signal Function)
These model years HD implemented a basic turn signal circuit using a bi-metallic, current/heat-controlled, Turn Signal Flasher Unit similar to those in automobiles. The 12v power wire feeds thru the Flasher and then goes to the handlebar switches. The Left or Right handlebar turn signal switch could be pressed to feed the power to the bulbs on that side of the bike. When connected to the bulbs, thus completing the circuit, the Flasher unit would supply power until the current flowing through it would heat the bi-metallic elements sufficiently to cause a break (like a circuit breaker) in the circuit. Once the flasher cooled down, the bi-metallic elements would again conduct power to the turn signal bulbs, thus causing an on-off cycle that repeated until the handlebar switch was released.

From 1973-1981, the handlebar TS switches were small pushbuttons. They were momentary contact. The turn signal only stayed flashing while the button was depressed.
From 1982-1985, the handlebar TS housings were changed, creating a larger TS button. The switches were still momentary contact, working only while the button was depressed.

  • (Converting to LEDs) - Because of the way these bikes were wired, you can replace the single current/heat-activated flasher with a new electronic flasher that is capable of properly flashing LEDs or Incandescent bulbs. However, the indicator light may need to be modified by grounding one side and feeding power from the right and left circuits thru diodes to the power side of the indicator.

Signal-STAT Flashers (6v)

From a service bulletin in 1961:
Different flasher modules have different characteristics. It is important to use the appropriate one when replacing them. For instance:

  • Flasher (68543-61) was originally used for directional signals with 21 candlepower to the front and rear lamps (6872-50) and 1 candlepower pilot lamps (71090-47). If any of the signal bulbs burn out, the pilot lamp in the same circuit will remain on.33) Flasher (68543-61A) was the replacement for directional signals. 34)
  • Flasher (68542-61) is used for pursuit lamps or other flashing lamps which use either one or two 32 candlepower lamps (68715-49).35)
Year modelPart #Used ForMarkingsApplication
Voltage
Notes
1957-E196368543-61Directional signalsN 221-6V63-prongs: X (hot), L (switched), P (not used)
1957-196568543-61ADirectional signals143-12V6Replaced 68543-61 in L1963.
Disregard the 12V markings per HD.
2 prongs: X (hot), L (switched)
68542-61Pursuit lampsF 421-6V6

Hazard Warning Flashers

1968 and 1969 XLH got a Flasher Kit (68541-68). 1970-1972 XLH/XLCH got Flasher Kit (68540-70). 1973-1975 XLH/XLCH got Flasher Kit (68540-73).

Hazard Flasher Kit (68540-70)……… Click Here to download the instruction sheet.
36) 37) 38)

Factory Horns

Subdocuments

1952-1964 K model, Sportster 6V Horns

1952-1964 K model, Sportster “Jubilee” 6V Trumpet Horn and Parts
Year ModelHorn
Part#
Horn TypeHorn Mtg.
Bracket
Horn
Power Pack
Power Pack
Mtg. Bracket
Support
Bracket
Horn
Cover
Horn
Screen
1952-1954
K Models (all)
69003-52 69142-52(included
w/ horn)
69013-54
laminated
rubber
- 69140-52
69140-52A (59)
69016-52
69019-52 69142-5269015-52
1957-1964
XL/XLH
69019-57Delco Remy69029-5769014-5469013-5469031-5769140-5469016-52
1959-1961
XLCH
69002-47B
69002-47C (62)
69002-62 (63)
Delco Remy
Model 16
Type M
Included
w/ horn.

Parts order
(69052-62)
x (4)
laminated).

69122-61P (67)
- - 69031-57 - -
1962 XLCH69002-47C
69002-62 (63)
69002-62A (66)
Delco Remy
Model 16
Type S
- - 69031-57 - -
1963-1964
XLCH
69002-62
69002-62A (66)
Delco Remy
Model 16
Type S
- - 69031-57 - -
Horn capacitor (32727-63) added on XLCH engines #63XL-3015-up

1965-1985 Sportster 12V Horns

1965-E1973 Sportster 12V Horn and Parts
Year ModelHorn
Part#
Horn Mtg.
Bracket
Rubber
Isolator
Mount
Inner
Support
Bracket
Horn
Cover
Horn
Cover
Spacer
Horn
Ground
Strap
Horn
Capacitor
1965-1966
XLH/XLCH
69000-65
(low F note)
69000-76 (76)
69052-65
69052-65A (66)
69117-65 (67)
69125-65
5/16“-18 threads
69129-6569138-6569144-6570016-65
(“U” shaped
metal)
70016-65A
(braided wire)
32727-63
on 63-69
XLCH
(only)
1967-1972
XLH/XLCH
Standard seat
69000-65
69000-76 (76)
69117-6569125-6569129-6769138-6569144-6570016-65
70016-65A (68)
1970-E1976
XLH/XLCH
69001-70
(high A note)
69016-76 (76)
69141-70 -
L1970-E1971
XLH/XLCH
w/ Accessory
Low Seat
69000-65
69000-76 (76)
69117-65
69117-71 (L71)
69117-71A (72)
62563-65
1/4”-20 threads
69125-65 (L71)
5/16“-18 threads
62563-65 (72)
1/4”-20 threads
69129-67
69129-71 (L71)
69129-72 (72)
69129-72A (75)
69129-72B (78)
69138-6569144-6570016-65A -
L1971
XLH/XLCH
OEM Low seat
69000-65
69000-76 (76)
69117-71 (L71)
uses 5/16“ iso
69117-71A (72)
uses 1/4” iso
69125-65
5/16“-18 threads
62563-65 (72)
1/4”-20 threads
69129-71
69129-72 (72)
69129-72A (75)
69129-72B (78)
69138-6569144-6570016-65A -
1972-E1973
XLH/XLCH
Low seat
69000-65
69000-76 (76)
69117-71A62563-6569129-72
69129-72A (75)
69129-72B (78)
69138-6569144-6570016-65A -
L1973-1985 Sportster 12V Horn and Parts
Year ModelHorn
Part#
Horn Mtg.
Bracket
Rubber
Isolator
Mount
Inner
Support
Bracket
Horn
Cover
Horn
Cover
Spacer
Horn
Ground
Strap
Horn
Bumper
Bracket
L1973-E1976
XLH/XLCH
69000-65
(low F note)
69000-76 (76)
69117-71A62563-6569129-72
69129-72A (75)
69129-72B (78)
69138-6569144-6570016-65Abracket
69041-73

bumper
(L76-E81)
(69042-73)
bumper
(81- )
(11428)
L1976-1985
XLH/XLCH
XLS/XLX
69000-76
(low F note)
69117-71A62563-6569129-72A
69129-72B (78)
XLH/XLCH/XLX
XLS (83-85)
69140-76 (chrome assembly)
XLS (80-82)
69011-76 (black assembly)
70016-65A
Horn assembly 69009-76 includes the cover. Replaced by 69003-76 (78)
L1976-1978
XLH/XLCH
69016-76
(high A note)
69017-76
(assembly)
70016-65A
1979-later, this horn was only sold in the twin horn kit (69003-76 )
1977 XLCR
1978 XLCR
69000-7669117-71A62563-6569129-72A
69129-72B
69011-76 (black assembly)70016-65A


Twin Horn Kits

The twin horn kits consist of the factory (low note) horn used together with the (high note) horn.

Sportster 12V Twin Horn Kits and Parts
Year ModelHorn
Part#
Horn Mtg.
Bracket
Rubber
Mount
Bracket
Inner
Support
Bracket
Horn
Cover
Horn
Cover
Spacer
Horn
Ground
Strap
Horn
Bumper
Bracket
69003-70
(70-E76)
XLH/XLCH
69001-70
(high A note)
69117-65 (2)69125-65 (2)10026 (2)69138-65
and
69141-70
69114-6570016-65A (2)
69003-76
(L76-
XL/XLCH
69016-76
(high A note)
69117-65 (2)69125-65 (2)10026 (2)69140-76
and
69017-76
69114-6570016-65A (2)



4) , 5)
photo courtesy of Ebay seller, American Vintage Cycles. Link to Ebay Store
13) , 14) , 15)
photo courtesy of Ebay seller, Evil Genius M/C Parts. Link to Ebay Store
16)
photo courtesy of Ebay seller, 57harleyrider. Link to Ebay Store
17) , 18)
photo courtesy of Boneyard Cycles in Melbourne, FL, Link to Ebay Store
27) , 28)
photo courtesy of Hyatt's Recycled Cycles. Link to Ebay Store
29) , 30) , 31)
photo courtesy of Boneyard Cycles in Melbourne, FL. Link to Ebay Store
32)
HD Service Latter ML-38 dated March 4, 1977
33) , 35)
HD Service Bulletin #438 dated March 28, 1961 pg OC-59
34)
HD Service Bulletin #473 dated February 28, 1963 pg OC-97
36) , 37) , 38)
photo courtesy of Ebay seller, jrs vintage harley parts. Link to Ebay Store
This website uses cookies for visitor traffic analysis. By using the website, you agree with storing the cookies on your computer.More information