Problem with wiring/fuse

International... · L Plate Warrior Joined: 13 Mar 2012 Karma :

Hi all,

Ive got a Honda CBR 125, a couple of weeks ago the fuse for the lights/horn blew, I replaced it thinking it was just a one off but it blew again... and again... 5 fuses later I decided that its probably something wrong with the bike. Stripped it down and I can see no bold / pinched wires, cleaned it and put a new fuse in (10amp) and it blew again, put a 20amp fuse in it just to see and that blew as well :s.

Any idea's what this could be?

Thanks,
-Ryan

wilcox.ian · Two Stroke Sniffer Joined: 14 Mar 2012 Karma :

take all the bulbs out and put the fuse in, switch on the ignition and lights, does it still blow?
turn off ignition, put in the side light, turn on ignition and lights, does it blow?
turn off ignition, put in dip side bulb, turn on ignition and lights, does it still blow?
repeat with the main beam bulb.

doing it this way will at least narrow it down to which (if any) bulb it is, if none, grab a wiring diagram and see what's wired into the same circuit Smile

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Vincent · Banned Joined: 16 Oct 2006 Karma :

You could also check the battery Pos + wire, make sure it's not chafing on the frame, and wires around the headstock, wires coming from the stator/generator, check inside the switches, reposition the loom to see if it helps. Use the correctly rated fuse wire rather than fuses while trying to find the problem, should save a bit on fuses Wink

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wilcox.ian · Two Stroke Sniffer Joined: 14 Mar 2012 Karma :

do you have a tester? would be a lot cheaper than blowing bulbs one by one Razz

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P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

Take alook at the headlight wires. They run close to the subframe.

Check the battery teminal/starter solenoid and the rear light.

Wires are really tight on the CBRs Neutral

International... · L Plate Warrior Joined: 13 Mar 2012 Karma :

Thanks for the tips guys, after looking at it I couldnt see anything wrong so I put it in the shop for them to look at... it turns out that the previous owned who fitted an aftermarket bracket accidently put a screw through some wiring Neutral

*muppet*

All fixed now Smile

WetSparks · Renault 5 Driver Joined: 05 May 2010 Karma :

Little tip here. If you have a situation where as above a fuse is constantly blowing, replace the fuse with a sidelight bulb. You can do this by soldering a couple of wires onto the bulb and then onto an old fuse so that you can plug it in.

If the bulb glows bright then you have a short circuit to find. If it only glows half dim when something else is switched on then all should be well. Using this method you can then track through your wiring looking for the fault. When you find it the bulb should go out. A lot cheaper than keep on replacing fuses and a lot safer.