Need help with odd electrical problem... - Wrist Twisters
 
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post #1 of 16 Old 06-20-2007, 09:47 PM Thread Starter
 
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Need help with odd electrical problem...

I'm having a strange problem with the lights on my 2002 919. Headlight, taillight, and the 2 front orange driving (turn signal) lights all come on fine. My brakelight and rear turn signal lights do NOT come on. Also, if I hit the turn signal switch the side I indicate goes off (and no blinking) in the front.

I checked the fuse and it's fine. What gives? Did I blow some kind of relay?

Any and all help is MUCH appreciated!

Thanks, Tom

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post #2 of 16 Old 06-20-2007, 09:52 PM
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Quote:
Originally Posted by tm530 View Post
I'm having a strange problem with the lights on my 2002 919. Headlight, taillight, and the 2 front orange driving (turn signal) lights all come on fine. My brakelight and rear turn signal lights do NOT come on. Also, if I hit the turn signal switch the side I indicate goes off (and no blinking) in the front.

I checked the fuse and it's fine. What gives? Did I blow some kind of relay?

Any and all help is MUCH appreciated!

Thanks, Tom

[email protected]

Did you check the whole length of wire for a short?

'02 RC-51
'10 Unicycle

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post #3 of 16 Old 06-20-2007, 09:53 PM
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the rear sigs only light when you switch on the turn sig by design. So you're saying they work when you have the turn sig switch on? If so i'd say that the relay is fine. if you've done any mods i'd check all the connections around the areas you were working. Could also be bad light bulbs if they are stock.

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post #4 of 16 Old 06-21-2007, 06:18 AM Thread Starter
 
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No, they DO NOT work at all. None of the turn signals blink at all. The front ones light up, but if I hit the turn signal switch then the side I've indicated with the switch goes dead until I cancel the switch, then it lights back up. The rears are completely dead (no light or blinking at all), as well as the brake light, but not the taillight (odd). I haven't been doing any work to the bike at all. There is no part of the electrical system that I've been modifying in any way. The only thing I had done recently was remove the battery and put it on a charger and then put it back in the bike the next day. I noticed this problem when I went to go for a ride yesterday. The only thing I can think of is the flasher, but why would that kill the brake light??

Thanks again for any input...
Tom

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post #5 of 16 Old 06-21-2007, 06:35 AM
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I was thinking that maybe since it's 5 years old a wire could have rubbed against the subframe or something and it wore through and shorted, maybe.

That's all I have.

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post #6 of 16 Old 06-21-2007, 06:36 AM
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* Why did you replace the flasher?
* Did your problem begin after the flasher was replaced?
* Is the new flasher OEM Honda?

The reason I ask; electrical gremlins seem to crop up after a replacement or mod. was done.

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post #7 of 16 Old 06-21-2007, 06:44 AM Thread Starter
 
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Ummm....I never replaced the flasher. I've never touched it.

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post #8 of 16 Old 06-21-2007, 07:12 AM
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Quote:
Originally Posted by tm530 View Post
Ummm....I never replaced the flasher. I've never touched it.
Misinterpreted your post. Take a look at the wiring diagram, it will help.

Wiring diagram

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post #9 of 16 Old 06-21-2007, 10:50 AM
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Yeah sounds like you've got a bad wire in the area of the sig\brake light circut. It could also be 2 diff problems. Check your connections at the switches for both... i.e. the brake lever and the turn sig. good luck.

i've been trying to figure out an electrical issue with my track bike for a couple of weeks now... they can be a pain in the rear for sure.

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post #10 of 16 Old 06-21-2007, 11:22 AM
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The front signals are dual-filament and there's a circuit to turn off the running light on the side signaling, so that's normal.

As for no flashy, I'd check the relay and it's connections.

Brake lights; I had mine go out and it turned out to be bad connections at the bulb(s). Clean these connections and apply di-electric grease (discussed elsewhere on this board) and see if this clears things up.

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post #11 of 16 Old 06-21-2007, 11:36 AM
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reconnect the 3 slip-loc connectors for the taillight & turn signals in the rear cowl... Somebody took off the rear cowl & forgot to reconnect them

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post #12 of 16 Old 06-21-2007, 08:32 PM
 
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Electricity is NOT Magic

Honda has a nasty habit of tying multiple grounds together in strange ways. The one thing all the lights you mentioned share is the ground circuit.

Check the continuity from one of the tail light plugs green wire to the chassis of the bike. If there is more than a small amount resistance then you have an open in the ground circuit.

DMM's are cheap and a "must have" item anyway. If you have a long enough length of wire you can simply strip the ends and connect it to the battery ground and touch the other end to one of the ground wires on the taillight or turn signal plugs and see if they work.

There is a possibility of failure in the factory wiring.

Shorts are easy to find because the mfg.'s put fuses in the circuit to create and open so if a short occurs the wiring does not overheat and cause a fire.

The biggest mistake I see in regards to electrical systems is that most folks do not check for open circuits.

Troubleshooting an electrical system is analogous to troubleshooting a hydraulic or pneumatic system except that if there is an "leak" in the system you don't see or hear the electrons "leaking".

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post #13 of 16 Old 06-21-2007, 08:48 PM
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Quote:
Originally Posted by tm530 View Post
I'm having a strange problem with the lights on my 2002 919. Headlight, taillight, and the 2 front orange driving (turn signal) lights all come on fine. My brakelight and rear turn signal lights do NOT come on. Also, if I hit the turn signal switch the side I indicate goes off (and no blinking) in the front.

I checked the fuse and it's fine. What gives? Did I blow some kind of relay?

Any and all help is MUCH appreciated!

Thanks, Tom

[email protected]
If you ruled out the simple things like fuse & blown bulbs.
Checked to make sure the loom plug didn't become disconnected under the rear cowling.
Then check for a broken wire in the handlebar switch.

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post #14 of 16 Old 06-21-2007, 09:32 PM
 
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Tail light/brake light may not be related to blinkers at all. The tail light uses dual filament bulbs and I guess it's possible for one of the filaments to burn-out and not the other, leaving you with a tail light but no brake light (or visa versa).

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post #15 of 16 Old 06-21-2007, 09:59 PM
 
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Reading Comprehsion IS Magic

I screwed the pooch with my earlier assessment.

I missed the part about the taillights working. My Bad.

Check the bulbs. Quick and easy. While the rear cowl is off check the power plugs too.

I use an electronic relay because my bike has LED signals. It's rated at 10 amps and is cheaper then the Honda unit. If your relay is shot you might consider that alternative.

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post #16 of 16 Old 06-22-2007, 07:30 AM
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I was going to suggest looking for a hunk of sheet metal under the drivers seat that may be cutting wires in half?

'02 RC-51
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