[Mark C]

Happy New Year, I have a 1970 cst 10 I'v changed the turn switch, headlight switch, and about to change the wiring for my head light, I have a short some where in that system,any Ideas ?

 

[406Rich]

Give us a little better idea of what it is doing or not doing.!

 

[c10]

Okay put a 12 volt lighted tester between the battery ground and the battery

If you have a short the light will stay on when the truck is turned off.

Try pulling fuses one at a time until the light goes out that way you know wher to start.

Otis

 

[1971BB427]

Okay put a 12 volt lighted tester between the battery ground and the battery

If you have a short the light will stay on when the truck is turned off.

Try pulling fuses one at a time until the light goes out that way you know wher to start.

Otis

Might not work with things like a stereo, optional alarm, etc. that will pull current when the key is off. Best thing is to pull all the fuses and then install the test lamp between the battery terminal and the cable end. Then with the key off you can simply install one fuse at a time until the light comes on. If it comes on with the radio fuse, then you can remove it and leave it out until all the others are installed and checked.
More than likely if the short is affected by both headlights and turn signals it will be in the park lamp system, and not headlights. I would isolate the wiring to the rear tailights, and see if the short disappears. If it doesn't then isolate the front park lamp wiring and see if that does the trick. Once you've figured if it's front or rear you can follow the harness and check for bare wiring.