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Blowing ignition fuse...thoughts?

Posted: Sat Aug 28, 2010 1:46 pm
by crosstowntraffic
So I have posted on here before, my fzr600 was having some electrical problems that you guys helped me sort out. I got hit on that bike a couple weeks ago, and it was totaled. I bought a new bike, an fzr400 with a 98 fzr600 motor. Its a super fun bike, but wouldnt you know it, this one has electrical problems too. I had the bike for about a week and I was riding home from work and the bike just shut off. Popped off the seat, and checked my fuses. I had a blown one, had a couple extra fuses, and they blew as soon as I turned the key. Before I even hit the start button. I looked for any loose wires and such, nothing obvious. The ignition fuse goes up to the engine stop switch. Everything looked good there too. The bike has an r6 VR already, so I dont think it has anything to do with that. The wiring and everything looks pretty clean on the motor swap from what I can tell, and it looks like all the wiring matches up with the fzr600 wiring diagram I have.

Heres the weird thing. If I let the bike sit for a day, put in a new fuse it will start for about 5-10 seconds before it blows it. Once it blows it, it will blow all the other I put in as soon as I turn the key. Any clue what this could mean.

Also, I'm not great with electrical. I can usually track things down, but at the same time, I dont really know exactly how it works. If I use a test light on the blown fuse, one side doesnt light up obvoiusly, does that mean that is the side the problem is coming from? Is there a way to test how many amps are coming through without wasting a fuse everytime I try something new?

Out of the fuse box, all of the fuses connect to the same wire shortly after the fuse box. None of the other fuses are blowing. Do you think its safe to say the problem is coming from the other side of the fuse and I should start tracing that way?

Thanks.

Re: Blowing ignition fuse...thoughts?

Posted: Sat Aug 28, 2010 2:10 pm
by thatkid
It's defiantly shorting somewhere after the fusebox, otherwise the main fuse would blow. The Brown wire that connects to all fuses comes from the Ignition Switch.

The Red/White wire connects to the ignition coils, and the engine stop switch. From there Black/Red wire connects to the TCI (located under the riders seat, 2 connectors) and main relay.

I would disconnect the coils, TCI, and main relay. With the engine stop switch in the OFF position, connect an Omh meter to the main fuse (left side female spade) and ground, it should be infinite Ohms (open circuit) if so, reconnect the coils and retest (for open or short circuit), then put the engine stop switch in the ON position retest, reconnect the TCI retest, reconnect the main relay retest. Obviously you may not get that far, as soon as the short circuit appears, there lies the culprit.

Oh yes glad to here it was only the bike that got totalled, and not You.

Re: Blowing ignition fuse...thoughts?

Posted: Sat Aug 28, 2010 2:43 pm
by crosstowntraffic
Thanks! Thats a great help, but one stupid question, I've got the main relay and TCI disconnected, but how do I disconnect the coils?

Re: Blowing ignition fuse...thoughts?

Posted: Sat Aug 28, 2010 2:52 pm
by thatkid
Tank cover off, there's two connectors one Yellow one White, wire colours are Orange Red/White, Grey Red/White.

Re: Blowing ignition fuse...thoughts?

Posted: Sat Aug 28, 2010 11:15 pm
by thatkid
Yep I've dropped another bollock (too much on my mind) I should have said Ignition fuse, Right side Female spade (as sitting on the bike)

Flame away I deserve it. Can't even get my left/right, right :P