Join Date: Sep 2004
Location: Spring Grove, Illinois
Bronco Info: 79 Bronco, 47 Binder
Put a test light in between the POS post on the battery and the POS cable going to the solenoid. Make sure the doors are closed and the hood light is off. If the test light light's up you have a short somewhere. Start pulling fuses till the test light goes out. More than likely it won't be the solenoid. A bad set of diodes in the alternator will drain a battery down.