Battery/Electrical Problem

[mustangII460]

Your alternator can run the car with good voltage and just a few amps. Flip your meter to amps, and check. Don't know what amp your alt is but it probably 60 amps or better.

Disconnect the negitive battery cable and put a test light between the cable and the battery. If the test light is on, there is a draw somewhere on the battery. That would drain your battery. If the lights on, go to the fuse box and remove one fuse at a time until the light goes out. Remember-your door open may cause the light to turn on. So shut the door each time. Maybe you'll find a simple switch bad.

Door switches, glove box switches etc can jam closed and cause a draw.

Do check all of the battery connections, remove sand/clean/replace and test.

Good luck.