Okay I have a CBR600F4 it’s a 99 model. Every time I start the bike the main fuse blows(30) I was told it was a bad wire or improperly grounded wire and to check the grounds. Instead of doing so I completely bought a brand new harness for the whole bike and reinstalled it with the new grounds in proper place. Before changing the harness the bike would blow the fuse when the key was turned to the on position. You could turn off the kill switch and the lights on the dash would show and you could hear the fuel pump running for some odd reason while the key wasn’t even activated yet. With this being said now with the new harness it blows the (30w) fuse just as soon as the positive terminal is connected even if the key isn’t in the ignition. The only two wires that go from the starter relay are a negative battery wire and a negative starter wire I believe. Could I need a new starter or starter relay? Or could it be the rectifier? Please help this is getting really pricey and I don’t wanna keep ordering new parts for the bike just to troubleshoot
Motorcycles
Answers & Comments
There is a short circuit that wasn't caused by the wiring harness but is caused by either something wrongly connected or by a faulty component.
The advice above is good but I suggest you begin by obtaining a wiring diagram and ensure every wire is going to where it is meant to go as a first and very important measure.
The bike probably has a negative ground system so the negative battery post would go to the frame, etc. and a battery positive would go to the starter relay or solenoid.
Thanks for the details, they do help. Is there a way you can disconnect different electrical circuits from the battery? Like Disconnect the lights, horn, or other components then start adding them back until you find the circuit or group of wires that causes the short. Because it seems you have a short somewhere, or something really putting a load on that 30 Amp fuse. So I'd break the circuits down to smaller pieces so that when you reconnect the lights, or starter, or whatever....that the fuse pops and you know the circuit causing the issue. You may have to open engine components like a magneto to isolate the circuits. But it shouldn't cost you anything except time.
Lights are disconnected