I'm tearing the wiring apart in my 81 Brat to find the source of one or two electrical gremlins. The one I'm tracking down now is lighting related. That is, they don't come on. I test a ground wire near the head lights, and when they're off, it's grounded, but when I turn them on, the ground wire goes to 12V. I pull out the bulb, but leave the light switch on, and it goes grounded again. Plug in the bulb, the ground wire goes to 12V. I tried a couple different bulbs with the same results. Any ideas what might be causing that?

 

Lachlan

 

Edit: SAt to think a while, and realized the cause was science. No ground = no current = no voltage drop. On to my next mysterious problem!

Edited January 16, 201214 yr by Lachlan

the bottom or second to the bottom fuse in the fuse box will be melted on the end. replace with a circut breaker fuse.