WEIRD electrical problem: Left Turn signal & Radiator Fan - Honda Motorcycles - FireBlades.org
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post #1 of 5 Old 07-21-2012, 2:50 AM Thread Starter
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WEIRD electrical problem: Left Turn signal & Radiator Fan

Okay, so this is a really weird issue with my 02 CBR954RR.

First off, I tried to search the forum and came up with nothing, so if the solution to this is in another thread and I missed it, I apologize for wasting your time.

There seems to be some sort of connection between the power for my left turn signal and the radiator fan. I'm not sure where they could possibly be connected, because the only common wire to them seems to be one of the ground connections. Except that the ground is common to a lot of different items, and it's only the left turn signal that causes this issue.

Running lights work fine. Dash indicator light works fine. I hit the left turn signal, it flashes slower than it should be, and I can hear the radiator fan spinning up and slowing down in time to the turn signal.

Bike warms up to it's normal temp when the fan should kick on (about 212 Fahrenheit) and the fan turns on like normal, and the left turn signal starts flashing. Bike cools down, fan turns off, signal stops flashing.

The ONLY change made to the bike in the last year, other than oil changes, has been swapping the 8-year-old YTZ10S for a Ballistic Performance 12-cell LiPO battery.

I already swapped the batteries back, and the issue is still present.

I have stared at the wiring diagram until I can see lines and wiring symbols even when my eyes are closed, and I can't figure this out.

If anyone has any ideas that don't involve tearing apart the entire wiring harness, I'd love to hear them. I'll do it if I have to, but I'd like to avoid it if I could.

Thanks again guys.
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post #2 of 5 Old 07-21-2012, 4:01 PM
 
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Re: WEIRD electrical problem: Left Turn signal & Radiator Fan

That's a real head-scratcher.

You cleaned the shared ground terminals and the frame real good right? I wish I was better with electrical diagnostics.

I live in Sac too, Roseville...
What areas do you like to ride?
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post #3 of 5 Old 07-22-2012, 5:45 PM Thread Starter
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Re: WEIRD electrical problem: Left Turn signal & Radiator Fan

Yeah it's weird. I am going to start checking all the wiring tonight.

I usually roll solo when I ride. I work at CycleGear in Sac and since I work every weekend I am usually free only when everyone else is working. Mostly just cruising around in the foothills. Oh, and you'll probably never see me on Salmon Falls...
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post #4 of 5 Old 07-22-2012, 5:51 PM
 
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Re: WEIRD electrical problem: Left Turn signal & Radiator Fan

The fan circuit gets a constant 12 volts when the bike's on. So when this circuit is grounded by the fan switch, it's providing power to the signal circuit as well by the sound of it.

If you remove the fuse for the signals, does the fan still come on? If you remove the fuse for the fan, do the signals flash when the bike's up to temperature?

It might be worth going through the connectors for each circuit and checking for any corrosion, crossed wires etc.

If the bike isn't braking properly, you don't start by rebuilding the engine.
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post #5 of 5 Old 07-22-2012, 6:05 PM
 
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Re: WEIRD electrical problem: Left Turn signal & Radiator Fan

Quote:
Originally Posted by -Z- View Post
Yeah it's weird. I am going to start checking all the wiring tonight.

I usually roll solo when I ride. I work at CycleGear in Sac and since I work every weekend I am usually free only when everyone else is working. Mostly just cruising around in the foothills. Oh, and you'll probably never see me on Salmon Falls...
Is your 954 titanium/black?
90% of the time I ride alone too.
Don't like Salmon Falls? To many riders? Cops?
I don't like 49 from Auburn to Placerville. Great road, WAY to much traffic.

Good luck with your electrical issue.
Sky's suggestion makes sense to me.
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