My 84 na wil not hold charge overnight. Its not the altenator because when i put a jump box on to get it running its fine for the rest of the day. Its only when it sits for long period of time whitout starting it. I bought a new battery, but that didn't seem to help, i have gone through the car countless times looking for anything that could be doing this, but so far nothing. Does anyone have any experience with this type of problem?

 

its called a short. i will let somebody else take it from there..

 

Door pin switch... interior lights... stereo / amp wired wrong, etc etc etc...

 

I'll put 5 bucks on it being the door pin switch. You're gonna have to explore your cars wiring with a multimeter.

 

not sure if the z`s have this problem but I know a bad voltage regulator can do what your describing. I would probably ignore me and listen to everyone else though.

 

if the voltage regulator when out then it would be either over charging and killing the battery or it wont charge/enough to fully charge the battery...

 

Not always, I have a thunder chicken the v-regulator went out. And it wouldn`t keep a charge overnight. Took me months to figure it out because it didn`t fit the profile. Just something else to check.

 

WTF is a thunder chicken? and is it internally or externally regulated?

 

Ha, 1987 ford Thunder Bird. And it was externally regulated.

 

Whats a door pin switch?

 

oh man....

The name should give it away... it's the switch for the doors. When you open a door, it pops out and turns on the interior lights.

 

ok, i know what your talking about. I know there is nothing wrong with that, the lights turn off when i close the doors.

 

Where would be the best place to start with a multimeter?

 

I'd try a test light on the hot wire of all the accessories. the ones that you can't tell that they are obviously on just by lookign at them of course...