Author Topic: Fuse pops when headlight turned on (CB450)  (Read 304 times)

Offline redrover

  • Posts: 193
Fuse pops when headlight turned on (CB450)
« on: Jul 12, 2018, 19:08:33 »
1972 CB450

 I just installed a lithium battery and organized everything into a custom electronics tray... Now, the fuse pops as soon as I flip the headlight switch.

 Iíve checked for pinched wires. Even when the wires are all loose and not packed, still pops.

 Anything Iím missing?

 Are there any basic things I should check?

Offline irk miller

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Re: Fuse pops when headlight turned on (CB450)
« Reply #1 on: Jul 12, 2018, 20:34:40 »
If you're fuse is popping, you know you have a short somewhere. Time to break out the meter and check the circuits.  Hopefully, you've just figured out it's just the headlight circuit.

Offline redrover

  • Posts: 193
Re: Fuse pops when headlight turned on (CB450)
« Reply #2 on: Jul 12, 2018, 23:00:12 »
Thanks for chiming in; Good call... I did bust out the multimeter, and popped open the headlight bucket to get started, but before really digging into it, I realized that the terminals on the lithium battery are totally exposed! (Even seen in the photo I posted). Idk how I missed it, and the spark from the headlight wire must have jumped the wire when stuffed in right under the cafe seat.

I sealed up all of the exposed terminal area, as well as the exposed bolt wiring on the starter relay module... and viola, runs like a beast with no fuse popping. Problem solved!