V8what?!

My car was losing power overnight. If I jumped her, she would run, but after I parked overnight the battery would drain out. A check with the multimeter revealed pulling the 30 amp HEAD fuse as the culprit. So, now how should I go about testing for the actual faulty wire?

HAILERS2

HEAD fuse feeds the positive side of the Headlight Relay located in front of the radiator area. It can't bleed batt power unless that relay has a gnd put on it by the headlight switch in the interior. I'd rule that out if the headlights are off. I figure you'da seen that if they were on.

But it also feeds a relay inside the headlight switch that controls the retraction of the light assy's. See attached jpg. It's the red wire going into the headlight switch. Seems that red wire goes to a coil and also to a set of switches that are labled UP and DOWN and those two leve the headlight switch and go to the left and right headlight retract motors. So. You go to the headlight switch and select them ON. Doing that you put a ground on the aforementioned coil (which already has pwr 24/7 on it from the Red wire mentioned). The coil pulls in and makes the red wire now feed the UP wire going to the left and right headlight retractor motors.

Selecting ON with the headlight sw also puts a Ground on the RW wire going to the headlight relay up front of the radiator. Not your problem there since the headlights are not on when you have your problem.

The long and short of it is.........make sure one or both headlight assy's are not in a bind causing the power to be going to them all the time. If that's the case, and you have time on your hands, first remove the headlight retract plug from one side and let the car sit overnight and see what happens and if it still drains the batt, then pull the retractor plug off the other side and let it sit overnight to see what happens.

The headlight retract plugs SEEM to be round in shape if you look at the second jpg. So just pull one off at a time and see if that solves something. I doubt the headlight switch is the bad actor.

Or if you had a meter you that measures amps, you could just pull the plug off one retract motor at a time and watch the meter. Like the third jpg shows how to do. In you case you just leave the key out etc and turn nothing on/off. Just connect your meter as shown and observe the amperage. Then pull one retract plug off at a time and figure out which caused the amperage to go down.

Fourth jpg shows the location of the Headlight Relay on a 1987 car. Other years have it in the same area.