2003 RC51 New owner and Electrical issues - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 15 (permalink) Old 05-02-2018, 07:47 PM Thread Starter
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2003 RC51 New owner and Electrical issues

Hello everyone,
I am a new owner of an 03 RC51, got the bike last week. Bike ran few days ago. Washed it and waxed it. After 3 days, I tried to turn it on and it wouldn't start. I installed a new battery, made sure the kill switch was off, checked the kick stand safety switch, checked the fuse by the battery, and everything is good. I am stumped. When I turn the key, I hear the fuel pump turn on, the gauges turn on, N light and oil light turn on after the FI and gas light momentarily turn on. Any help would be appreciated. I am still learning to navigate the forum.
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post #2 of 15 (permalink) Old 05-02-2018, 08:49 PM Thread Starter
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Checked the starter relay 30amp fuse and that's good. I am just not hearing it click. I jumped it to make sure the starter work and it turned. Am I missing something? starter relay stuck?
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post #3 of 15 (permalink) Old 05-02-2018, 08:50 PM
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If I am remembering right the RC might have had a clutch switch requiring that the clutch be pulled in when hitting the starter. I might be thinking of another bike though. But if so that might be the culprit. Fuel pump would prime but nothing when you hit the starter. Does it turn over when you hit the starter at all?
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post #4 of 15 (permalink) Old 05-02-2018, 09:00 PM
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Starter spins motor over and you have 12.8 volts (13.4V for lithium)? If that's good I would check for spark next. Welcome to the forum. I'm sure you'll get it sorted. There are several very experienced people on here so follow trouble shoot path if you have a manual and then if still stumped post your results/ questions. Had a similar problem recently where bike was running fine a few months ago and then I did some mods including battery and solenoid relocate. After checking practically half the circuits found a bad crimp I had done to extend the Power Commander ground. Ya didn't power wash it did ya?
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post #5 of 15 (permalink) Old 05-02-2018, 09:21 PM Thread Starter
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BT, bike was starting fine with out I took off the front fairing as I was also fixing headlights, there was a covered sensor or relay 12v that was hanging on the left of the bike, when I took off the rubber cover it had a little bit of water. Not sure what that is. I have 12.9 volts. The bike doesn't turn, ignition on, fuel pump on, no FI flashing, when I click the starter button , nothing happens. I had my vfr750 do this but you could hear the relay. I don't hear it clicking or buzzing. Its like there is no power transferring from the relay. Could the relay be bad? Is there a fuse in the fuse box that controls it? I am about to take a video and post it.
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post #6 of 15 (permalink) Old 05-02-2018, 09:59 PM Thread Starter
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Fixed it! Checked the fuse box and 20 amp for lights was out, put the spare in and it worked. Didn't know a cut off switch was connected to that. Odd, but it worked! Thanks to everyone!!! Now I don't want to wake up my neighbors, will have to wait till this weekend! This sucks, but now I can rest!
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post #7 of 15 (permalink) Old 05-02-2018, 10:14 PM
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That's great! Always satisfying when ya fix it yourself.
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post #8 of 15 (permalink) Old 05-02-2018, 10:56 PM
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was going to tell you to check the headlight fuse, but looks like you got it.



the start button turns off the headlights when you press it, so honda simplified the wiring by using the headlight circuit to run the starter relay. if the fuse is blown your start button does nada.
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post #9 of 15 (permalink) Old 05-02-2018, 11:30 PM Thread Starter
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That is crazy! Now I need the wiring diagram from the headlights as I had clipped them to remove the front fairing when I towed the bike home. I did not label them or take a picture. PO did some rigging, so will have to go through them. Looks like he combined the left light with the right. I obviously connected them wrong. I have to figure out what he did, if not I will put them back the original. Bikes has lots of mods, I wonder what the wiring one is.
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post #10 of 15 (permalink) Old 05-02-2018, 11:54 PM
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There's a blue black, a blue white, and a green.


The blues are positive, the greens are negative.


You can't screw it up seriously.
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