Drain on battery

NCIRINO

MEMBER
1998 FORD EXPEDITION
5.4L
V8
4WD
AUTOMATIC
207,000 MILES

Car will not start. Have replaced starter, battery, and alternator all within the last year. Something keeps draining on the battery to make for not enough voltage to start. Car will start when jumped.

Monday, August 27th, 2018 AT 8:01 PM

3 Replies

DANNY L

MECHANIC
5,648 POSTS

Hello, I am Danny.

That best I can advise is if you know someone with automotive/electrical knowledge and a 12 volts test light to do the following. Using the test light with engine not running disconnect the negative battery terminal and install the test light in between the battery terminal and the battery. Start to disconnect the fuses in the under hood junction box one at a time. When the light dims/goes off on the tester you will the know what circuit is drawing power/draining your battery. With me so far? We can go from there. Hope this helps and thanks for using 2CarPros.
Danny-

https://www.2carpros.com/articles/how-to-check-wiring

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Monday, August 27th, 2018 AT 8:13 PM

NCIRINO

MEMBER
2 POSTS

Pulled all the fuses while using the test light as instructed. No fuse caused the light to dim or turn off. Could it have anything to do with the ignition? Where is a good place to start looking for answers?

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Wednesday, August 29th, 2018 AT 9:09 AM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Lets look at the seat and mirror switches to see if any are stuck this will cause the battery to drain down. Here is a guide that mentions other obvious problems:

https://www.2carpros.com/articles/car-battery-dead-overnight

Please run down this guide and report back.

Cheers, Ken

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Friday, August 31st, 2018 AT 2:43 PM