I have a 1977 G20 that has a new battery, new alternator and new starter. The battery is going dead over night. The battery and alternator both test good. It is not showing a draw with a multimeter. I can see or hear nothing running when I turn it off. When charged, it starts easily and immediately. It all started a little time after when I installed a new starter and after I starting removing some of the wires from Aux items that were no longer operating or even existing in the van. Ie an after market AC unit and cruise control.


Any ideas as to where I should look first? Thanks!

 

Since the problem started when you removed the wires, I would start looking where the unneeded wires were. A wire could be touching something it shouldn't be touching.

 

I ran into a similar situation once, and fortunately I'm a pack rat.
I had an old analog Ampmeter, which had screw terminals. I twisted two wires on it, squeezed two blade type male connectors on them, and inserted it/them in the place of each fuse. It was a short in the Radio for me.