Wtf??

[willett]

Hey again,

Did a cab swap on my '78 k20. I re-used my old harness.
Now when I pull the headlight switch out my gas gauge drops to below empty and none of the cluster backlights illuminate.

I'm guessing I'm having some sort of ground issue here but I could use some direction on where to start.

Is there a master cluster ground wire?

My other interior lights are working, I still need to pick up a new cab ground strap. To be honest I'm not really sure how the cab is getting negiyie feed but since my other interior lights are working I don't think the the root of the problem.

Ps. Same cluster and same wiring harness that was in my old cab.

Thanks
Spencer
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