1966 c10 chevy truck
Engine or electricals?
Either way I would check the battery electrical connections, battery and alternator voltage and the ground strap.
A/c Factory. Or somewhere else
Sounds like you need a larger alternator, no enough amps for the load
I would look for a battery cable issue such as corrosion or hidden corrosion. Also the grounds need to be checked and cleaned. I have had battery connections that looked perfect, but caused issues.
Looking for a Used C/K 10 in your area?
CarGurus has 1 nationwide C/K 10 listings and the tools to find you a great deal.
Search Chevrolet C/K 10 Questions
Chevrolet C/K 10 Experts
Related Models For Sale
Used Cars For Sale