battery drain on ford f150 1998

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bj17455

Member - Posts: 6

Joined: July 18, 2007

Location: United Kingdom

Posted: February 02, 2009 at 1:17 PM / IP Logged

can any one help please I have had a ford f150 1998 brought to me with the battery going flat over night i have found that the drain comes from fuse 15 in the fuse box but as we have not got any information with the vehicle we dont know what runs of this fuse I know the interior lights are but is there any thing else or as anyone any ideas please many thanks BJ

bjclarkeuk

KPierson

Platinum - Posts: 3,527

This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: February 02, 2009 at 3:01 PM / IP Logged

On a lot of vehicles the dome light circuit is also the constant power for the radio.

I would do this:

Remove fuse 15

Charge the battery up

Start the vehicle and try EVERY electronic function of the vehicle and note any that arn't working (for the radio make sure the presets and clock are being kept, if they arn't then the fuse you pulled is the memory for the radio).

Only after you identify everything that is on the fuse can you start eliminating items one by one to figure out where the problem is.

It would also be benficial to see how much current is being drawn by that circuit, as it may give a clue as to what the device is.

Kevin Pierson

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: February 04, 2009 at 4:46 PM / IP Logged

KP is right but I can't see a dome light unless there are about 5 bulbs pulling down a battery overnight. I'd look for something else or suspect battery/alternator or both. Done any testing? e.g. set a multimeter to 10 amps , pull the fuse, see which side is still hot, place pos meter lead ther and neg other side and close car and lock up. Check the current ratings, shouldn't be more that 40-60 milliamps.

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battery drain on ford f150 1998

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