Nothing happens on start - Page 2 - Honda RC51 Forum : RC51 Motorcycle Forums
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post #11 of 27 (permalink) Old 07-25-2019, 02:52 AM Thread Starter
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Yes that was my next step, ill do similar for the indicator switch as i feel it may also be dirty/faulty

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Originally Posted by Joe XR View Post
Take the starter button apart and see if the contacts are clean.
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post #12 of 27 (permalink) Old 07-25-2019, 09:46 AM
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If it worked before you messed with it it's not dirty contacts.

Your indicators share a circuit with the brake light and the horn.

Do either of those work?
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post #13 of 27 (permalink) Old 07-25-2019, 09:53 AM Thread Starter
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Yes they both work. And i did not mess with anything. Like ive said, when i went to fetch the bike nothing came on when i turned the ignition switch. The previous owner then opened the battery panel and re tightened the positive/negative bolts. Then it would come on. This is when i left and noticed the indicators did not work. Then at home i opened the battery panel to get to teh battery. I saw the shoddy wiring and as i tried to take out the battery it gave a short... After then fixing the wiring some it did not want to start and indicators still not working...

So yes i doubt dirty contacts but ive had this on my rebuilt Kawasaki ZXR where the indicator lights would stop working... after a clean it would work again... I am at a loss as to why only these two things are giving me problems now.

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Originally Posted by Wibbly View Post
If it worked before you messed with it it's not dirty contacts.

Your indicators share a circuit with the brake light and the horn.

Do either of those work?

Last edited by Wurnman; 07-25-2019 at 10:09 AM.
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post #14 of 27 (permalink) Old 07-25-2019, 10:11 AM
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Well I told you what to try.

If the brake light (the one that comes on when you pull the lever. Not the run light) and horn work then the turn signals should. Maybe they're just shitty and don't work. You can check for voltage very easily.
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post #15 of 27 (permalink) Old 07-25-2019, 10:51 AM Thread Starter
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I agree.. the indicator lights are shit or naff as i have also said previously. Those aftermarket flush mounted crap. Looks like rewiring was done on teh bike... Im stripping the bike this weekend to see what else in the loom/wiring was ripped apart. At least i know the bike wants to start but not from pressing the starter button. The lights ill replace with original spec aftermarket lights and redo the wiring.

FYI... both run lights and brake lights work

Thx for your help so far.

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Originally Posted by Wibbly View Post
Well I told you what to try.

If the brake light (the one that comes on when you pull the lever. Not the run light) and horn work then the turn signals should. Maybe they're just shitty and don't work. You can check for voltage very easily.
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post #16 of 27 (permalink) Old 07-25-2019, 10:53 AM
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if it IS a us model bike, there should be black/red in the kill switch connector (9 pin red connector), if you jumper the black/red to the yellow/red the starter should run. if it does you have a bad start button.

simple as that.
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post #17 of 27 (permalink) Old 07-25-2019, 11:24 AM
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Mine is a UK bike and the lights dim on starting. This seems logical, it drops the light load while the starter needs the juice to get it running, then they come on again.

It's not falling off, it's an upgrade opportunity
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post #18 of 27 (permalink) Old 07-25-2019, 11:26 AM
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Originally Posted by Tony.mon View Post
Mine is a UK bike and the lights dim on starting. This seems logical, it drops the light load while the starter needs the juice to get it running, then they come on again.
on US bikes, the start button actually shuts the headlights off completely. i believe this is the case on the later model Euro bikes as well, but not on the ones that had the slider switch that controlled headlights on the left side. there are way too many iterations of this bike with small differences. it's a pain in the ass.

on the bike in question, if the starter relay isn't pulling (which it isn't by the op's admission), then there is no reason for the headlights to dim due to battery load.

Last edited by Wibbly; 07-25-2019 at 11:30 AM.
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post #19 of 27 (permalink) Old 07-25-2019, 04:46 PM
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The headlights don't dim due to load when you're starting the bike , the starter button basically breaks ground to the headlight , while closing the circuit to the starter relay. Push the starter button with the engine running and the lights still go out , with no load on the starter.
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post #20 of 27 (permalink) Old 07-25-2019, 05:34 PM
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It opens the positive. But yes.


The common to the start button is from the headlight fuse

The normally closed contact feeds the headlights (both the low beam directly and the high beam relay)

The normally open feeds the positive to the starter relay
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