Brake light help please!!! - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 12 (permalink) Old 09-22-2014, 04:49 PM Thread Starter
bpw
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Brake light help please!!!

2002 rvt1000r new to me YAY!!! But the brake light doesnt work when either the foot pedal or the hand lever is depressed. The tail lights both work fine. I replaced the bulbs checked the fuses underneath the left fairing all is good there. I tested the wire at the bulb and Im getting juice for the tail light (both of them) but none for the brake light (either of them). So no current for the brake light at the bulb side of the harness. I tried disconnecting the front and back brake switch just to see if the brake light was stuck on and it was not. Any help is great Im stumped. It does have an aftermarket undertail but the OEM wiring does not appear hacked in any way.

-Brian
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post #2 of 12 (permalink) Old 09-22-2014, 05:06 PM
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Did you check the fuses visually or by using a ohmmeter?
I've had fuses blow near the base, where the middle part looks fine, but still to current flow.

Does your turn signals and horn work? If not, then it's a blown 10A Fuse D.
If they do work, and only the brakes, then further inspection is needed.
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post #3 of 12 (permalink) Old 09-22-2014, 07:27 PM Thread Starter
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thanks, horn and signals work and Im out of ideas.
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post #4 of 12 (permalink) Old 09-22-2014, 07:34 PM
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I'd check the switches (f and r brake) to make sure they are working (ohm meter). Then if working I'd engage one switch, holding as such (front brake is easy to do so) and start checking and working the wiring (twisting and flexing) from the rear brake lights slowly through to the front of harness (where the brake wiring runs). That would hopefully find the area of the short.
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post #5 of 12 (permalink) Old 09-23-2014, 07:10 AM Thread Starter
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Thanks checked the switches all good there twisted the wiring nothing.
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post #6 of 12 (permalink) Old 09-23-2014, 03:12 PM
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After looking at the wiring diagram, and based on the info that the horn and turn signals work, but the front and rear brake switches do activate the either brake lights, it sounds like a wiring harness issue.

Does this bike have an aftermarket undertail/lighting system?
The problem could be originating at that point.

If it's OEM light assembly, then I'd check if you have voltage at the brake light sockets between the G/Y and G wiring. Then start back-tracking.

Last edited by SubSailor; 09-25-2014 at 03:37 PM.
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post #7 of 12 (permalink) Old 09-23-2014, 10:20 PM Thread Starter
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There is no voltage for brake lights at the plug, there is voltage for the tail light. It does have a after market under tail but the original harness looks to be intact.
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post #8 of 12 (permalink) Old 09-24-2014, 01:04 AM
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Nobody can wave a magic wand for you bpw, you will have to systematically trace the fault
there are no shortcuts

Last edited by dansp1; 09-24-2014 at 08:12 AM.
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post #9 of 12 (permalink) Old 09-24-2014, 07:08 AM Thread Starter
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Lol not looking for a wand, also no idea how to trace down an electrical problem aside from cutting the harness and just following the wire until it gets power.
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post #10 of 12 (permalink) Old 09-25-2014, 12:59 AM
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Quote:
Originally Posted by bpw View Post
Lol not looking for a wand, also no idea how to trace down an electrical problem aside from cutting the harness and just following the wire until it gets power.
on a multimeter use the "diode" function, will act like a continuity test, then grab the end of the wire your testing and put a probe on that, then find the other end at the fusebox find the wire that's the same color and bang the probe on that end, if the meter then zero's out you have a good wire, if nothing then there is a break in it somewhere, then you have the lovely job of slicing the loom open to find where the break is

also when your at the fusebox end realise that there is a going to be a dead and a live side on the continuity test when you take the fuse out to probe the wire, so you might need to probe both contacts on the fuse holder to find out which connector is attached to the wire your testing

Last edited by weegaz22; 09-25-2014 at 01:04 AM.
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