Thread: Battery main fuse issue

Let me get this straight:

You suspect a short somewhere in the system that is draining the battery?
Why are you looking at the fuses?

you just put in a aftermarket radio?


your fuses have nothing to do with parasitic power loss.

something is being left on and drawing power when the car is off.

or your battery is on its way out.

more than likely they are just some buss fuses, they have nothing to do with your problem. if one was blown you would have a major electrical failure on your hands.

if your battery dies over night you have whats called parasitic power loss. aka something drawing power when the key is in the off position. this is why i asked if you had installed a aftermarket radio lately. but you keep talking about fuses.......

no idea where or what they go to, but id leave them alone.

id put a ohm meter on the battery and see what the draw is on it when the cars off. start pulling fuse till the meter goes back up.

so un hook the battery, test it hook it back up test it again. see if there's draw and how much. from years ago any thing more then .7 amps or something like that was to much. memory from a stereo draws up to 3, if its hooked up so you have to turn the radio off it will sometimes draw up to 10 and kill the battery over night.

you can also test to make sure the alt is charging properly. with the car off you want to see over 12 or more volts in the battery, with the car running test the battery, you want up to 14 tops or your over charging, 13.6 to 9 is preferred. anything under 13 and thats no good either.

60 AMP fuses?
At 12.5 volts thats over 1200 watts so it probably can't just be eliminated.
If they were 10 or 15 AMP I'd say maybe.

The best way to diagnose this is with a DC current clamp. Just find which wire at the fuse panel(s) is drawing a ton of current when the car is off.

I see what you're doing with the "spark test" but this may be misleading.

Unplug them and see what doesn't work.

have you at least tested the alt? lord knows if you jump it every morning and it makes it through the day, the alt could just be bad, and your chasing your tail.

you just keep saying this and thats not helping?

if you dont tell us what you have done already, how in the hell are we to know. we ask, you answer, thats how this whole thing works.

I'm saying ive narrowed it down to this. The alternator is disconnected for this. We found that the alternator is on its way out, but its okay for now.