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techtalk:ref:elec30 [2020/02/08 23:33] hippysmack [The Doctor71'S 1974 xlh] |
techtalk:ref:elec30 [2020/02/09 18:28] hippysmack [The Doctor71'S 1974 xlh] |
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====== Ironhead Wiring Mishaps and Meltdowns ====== | ====== Ironhead Wiring Mishaps and Meltdowns ====== | ||
\\ | \\ | ||
+ | See also illustrated [[techtalk:ref:elec07|1959-1985 Sportster Main Wiring Diagrams (created with reference to the OEM manual)]] in the REF section of the Sportsterpedia. \\ | ||
- | It's important to have some sort of fail safe mechanism whether a fuse wire, fuse or circuit breaker inline between the battery and the voltage regulator. \\ | + | It's important to have some sort of fail safe mechanism whether a fuse wire, fuse or circuit breaker inline between the battery and the voltage regulator. ((The Doctor71 of the XLFORUM http://xlforum.net/forums/showthread.php?p=5805036#post5805036)) \\ |
- | Else you can unsuspectingly experience a experience a dead short, melted wiring or even watching your bike go up in flames (literally). \\ | + | Else you can unsuspectingly experience a dead short, melted wiring or even watching your bike go up in flames (literally). \\ |
It appears that HD's quick fix in 1974 to the meltdown was Service Bulletin #659 adding a fusable wire inline from the battery. \\ | It appears that HD's quick fix in 1974 to the meltdown was Service Bulletin #659 adding a fusable wire inline from the battery. \\ | ||
[[techtalk:ih:elec02#fuse_wire|Clich here to see more on the fuse wire]] in the Sportsterpedia. \\ | [[techtalk:ih:elec02#fuse_wire|Clich here to see more on the fuse wire]] in the Sportsterpedia. \\ | ||
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It's important to have some sort of protection on the main circuit. \\ | It's important to have some sort of protection on the main circuit. \\ | ||
If it applies to your ride, you can ward off a potential meltdown in multiple ways. Do whatever works for you: | If it applies to your ride, you can ward off a potential meltdown in multiple ways. Do whatever works for you: | ||
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====== Broken Horn Bracket ====== | ====== Broken Horn Bracket ====== | ||
- | \\ | + | |
- | ===== The Doctor71'S 1974 xlh ===== | + | The horn bracket that is mounted along with the key switch between the cylinders has been known to cause meltdowns. \\ |
+ | The fact of the bracket breaking (due to being loose, vibration, age etc,) isn't the problem (electrically speaking). \\ | ||
+ | The key switch terminals are bare ended (no insulation). \\ | ||
+ | Should the horn bracket break, the horn will (most likely) swing down & rest on the back of the ignition switch for awhile, shorting the terminals. \\ | ||
+ | The subsequent dead short heats up the wires, melting them and triggers the carnage shown below. \\ | ||
+ | At this point, the motor is dead, no lights, no nothing. You're stranded on the side of the road, wondering just what happened. \\ | ||
+ | ===== The Doctor71's 1974 xlh ===== | ||
This happened to my 74 XLH and all initially started by a broken horn bracket: \\ | This happened to my 74 XLH and all initially started by a broken horn bracket: \\ | ||
- | This particular bike did not come with a fuse wire installed from the factory. So the main circuit was unprotected. \\\\ | + | This particular bike did not come with a fuse wire installed from the factory. So the main circuit was unprotected. \\ |
See the 'before' pic of the horn / switch brackets below (taken ≈ 8 months prior to my catastrophic event). \\ | See the 'before' pic of the horn / switch brackets below (taken ≈ 8 months prior to my catastrophic event). \\ | ||
The ends of the ignition switch wires were heat-shrink'd immediately after this pic was taken. \\ | The ends of the ignition switch wires were heat-shrink'd immediately after this pic was taken. \\ |