Rear brake light switch FAIL - cause engine "misses"? - 1130cc.com: The #1 Harley Davidson V-Rod Forum
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Old 11-13-2012, 07:53 PM   #1
eric_gt500
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Rear brake light switch FAIL - cause engine "misses"?

Riding the bike one last time this past weekend and, sure enough, about 100 miles from home bike started "missing". Felt like it could have been bad gas or something. Pulled over and got some fuel injector cleaner and put in fresh gas. Went to start the bike and noticed smoke coming from the bottom of the bike and saw the rear brake switch basically melting. At that point, i turned off the ignition, called the tow truck and its now at the dealer.

Question - could the failed brake switch be a cause or symptom. Could a shorting sensor mess with the electronics such that the bike would misfire? For background, I've got an 07 VRSCAW with SE heads and cams with a Daytona Twin Tec ECU. My exhaust is a BUB 7 2-1. as a side note, the switch has been dead for a while, I noticed it a couple months ago but just hadn't fixed it (I use my front brake always so didn't worry about it too much)

Any input would be appreciated as I wait for the dealer's diagnosis.
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Old 11-14-2012, 04:04 AM   #2
stever975
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Quote:
Originally Posted by eric_gt500 View Post
....could the failed brake switch be a cause or symptom. Could a shorting sensor mess with the electronics such that the bike would misfire? For background, I've got an 07 VRSCAW with SE heads and cams with a Daytona Twin Tec ECU. My exhaust is a BUB 7 2-1. as a side note, the switch has been dead for a while, I noticed it a couple months ago but just hadn't fixed it (I use my front brake always so didn't worry about it too much) ....
Don't know any details about the Daytona electronics but the HD ECM doesn't use the circuit that powers the brake light.

The rear brake light gets power from the O/W wire fed by the ACCY (accessory) fuse. If this fuse blows you lose the brake light and certain IM functions will fail (no fuel gauge or turn signals as well as a dead IM with ignition switch in ACCY position) but you'll still have IM diagnostics and the ECM will function normally.

You might want to ask here.
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Old 11-16-2012, 08:50 AM   #3
nightroddersp
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if the voltage regulator is on its way out, theoretically a drain/ground from a shorting switch could push the regulator over the edge. or even cause the alternator to screw up. the odd are slim but any time you introduce a ground into an electrical system relay and regulator can srew up. just mt opinion.
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