2003 Cadillac Seville Electrical

CADILLAC SEVILLE

MEMBER
2003 CADILLAC SEVILLE
V8
2WD
AUTOMATIC
148 MILES

Trying to find why the battery gets drained? So far I had the Alternator checked and it stated it was OK Then We charge the battery and the battery was OK Then we check with a little light on the fuses on both boxes in the back and in the motor area The fuses did not turn off the light, then kept the battery off to make sure it didn't get drain and the next day we notice that car was taking 4 amps which I believe still would've drain the battery if it was still on Where else can this power be coming from? This is Cadillac and has massive electrical system as everything is powered by electrical.
Any ideas?

1 Reply

WRENCHTECH

MECHANIC
20,758 POSTS

There is a procedure for finding a battery draw like that.

You will need a digital ammeter and a jumper wire with clips on the ends to do this.
First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least 10 minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated.