AAW 67-68 Classic Update warning lights didn't work properly

[rhstewart]

Hi,

New here. I have my father-in-laws '67 C20 I've been fixing up. I put in a new American Auto Wire Classic Update wire harness for the warning lights only dash. I noticed that the warning lights weren't working properly and finally dove into why. They wouldn't light up when starting the truck.

I proved the water temp and oil pressure sensors worked by grounding them out and fixing connections.

Tracing the problem I noticed that the ground wires through the ignition switch were missing. They didn't seem to be part of the wire harness at all which seemed awfully strange. Possibly a mistake?

I was a pack rat and kept the old harness wiring. I pulled the ignition switch wiring and spliced it onto the end of the gauge harness wire the into the ignition switch and the gauge harness. I'll post a couple of photos below.

Works like a champ. Hopefully this is helpful.

I'm curious if anyone else found the classic update harness without the ignition switch ground wires.

Cheers,
Rich

['68OrangeSunshine]

Originally Posted by rhstewart

Hi,

New here. I have my father-in-laws '67 C20 I've been fixing up. I put in a new American Auto Wire Classic Update wire harness for the warning lights only dash. I noticed that the warning lights weren't working properly and finally dove into why. They wouldn't light up when starting the truck.

I proved the water temp and oil pressure sensors worked by grounding them out and fixing connections.

Tracing the problem I noticed that the ground wires through the ignition switch were missing. They didn't seem to be part of the wire harness at all which seemed awfully strange. Possibly a mistake?

I was a pack rat and kept the old harness wiring. I pulled the ignition switch wiring and spliced it onto the end of the gauge harness wire the into the ignition switch and the gauge harness. I'll post a couple of photos below.

Works like a champ. Hopefully this is helpful.

I'm curious if anyone else found the classic update harness without the ignition switch ground wires.

Cheers,
Rich

That's great.
Here in Arizona we have real Pack Rats and they love to nest in engine bays and chew up the wiring.