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I have a question.I have a 66 d100 with a 68 wiring harness. When I turn off the key switch, the gages and radio stay on. If I let the truck sit it drains the battery flat in a matter of a few days. I got stuck the other day and had to get a jump to get home from work. I have been trying to trace it down. I found a 10 Ga red wire from the starter relay to the amp gage. It seems like everything is fed from this. I am thinking of putting a cut off switch and see if it fixes it. Just thought I would post here first and see if someone has some wisdom/ guidance to share

Thanks Matt

Matt,
that would work, but I think it is a ingition switch problem.
Orange wire off the relay goes to the switch, at the switch plug
there is a splice, from the orange, were a anouther orange wire
splits off and supplies the buss bar on the back of the gauge set, that is what gives the gauges power.
What is happening here is the switch in not killing the orange wire when
off and that leaves the gauges on. Replacement switchs are
avalable from Napa and I would advise against cutting ether of
the red wires that come off the alt gauge as any bad connections
will give you charging problems.

I thought it might be the switch. I swapped it with one from my parts pile and it still has the same trouble. I will try NAPA and see if I can get a new one. I hate to go and start cutting wires.

Matt