Josh:
This is one of those mechanical problems that's difficult to diagnose from a distance so all I can offer are some guesses.
Obviously it's electrical in nature.
I would check out the usual culprits in these situations which are the battery connections; Remove and clean the terminals(with a post cleaner - available in any auto parts store for $3.00) and reconnect tightly, using some dielectric grease on the terminals for protection. Follow and check the battery cable to the ground connection and clean and tighten that, too as it could be the problem. There is an engine ground strap on the firewall (woven brass) that should be taken off, scapped clean and reconnected tightly.
Check the connections on the alternator, especially the harness plug which should be cleaned. Reconnect tightly.
All these are free, fairly simple to accomplish and may solve the problem.
If not, you may need a professional mechanic
to investigate further and try to find the cause of the problem; but the more items you've checked and cleaned or tightened, the less they will have to do and the less you should pay, should it come to that.
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