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Battery Drain Problem

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Old 02-21-2012 | 08:56 PM
bilkyb's Avatar
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Default Battery Drain Problem

I will try not to make this too long but include as much info as possible.

Stock 2002 Explorer V8 XLT, no aftermarket accessories, just over 100K miles.

I have a battery drain that is severe enough that the vehicle won't start after two days. The battery was replaced in the last 60 days and is holding a charge when disconnected from the vehicle for a couple of days.

When connected the voltage drops about 0.5 volts in 24 hours. (12.81 @ 0630 and then 12.28 @ 0540 the next day.)

Drain is 300-320mA after all the normal things shut off after 15 or 20 minutes, it starts at .450 to .440 amps (haven't really timed that out to see how long it actually takes).

I have pulled all the fuses in the engine compartment with the following results:

#15 - Memory (KAPWR) - dropped from .310 amps to .200 (110 mA)

#18 - 4x4(v-batt 1) - dropped from .310 amps to .230 (80 mA)

#29 - PJB - dropped from .430 amps to .200 (230 mA). I did this one before the drop from the battery saver stuff.

Under the dash had the following results:

#3 - Radio, Amplifier, Power Antenna, DVD - dropped from .320 amps to .300 (20 mA)

#20 - PATS, Driver Seat SW, Memory SW, Driver Seat Module, BSM, Sunload Sensor - dropped from .310 amps to .200 (110 mA)

Also pulled the relays on top of the interior fuse block. Did not remove the block so I couldn't get the one for the Flashers out but:

#5 - Battery saver - dropped from .440 amps to .310 amps 9 (130 mA), this seems to correspond to #29 from the engine compartment.

I did not pull any of the relays for the trailering stuff in the rear relay box, didn't want to pull the trim panel until I have to.

Alone none of these seem too crazy but not sure.

The one for the 4x4 does bother me because my 4x4 indications on the instrument cluster flash randomly. I pulled the shift motor out to see if the stop post gromet was gone and all seemed fine. It also seems to shift in and out of 4x4. Verified it will go to "high" by lifting entire rear axle off ground and engaging and the front wheels pull the vehicle.

I also am concerned that I have some of the chaffing of the wire harness that goes behind the oil filter drip tray. I am wondering if this is part of my battery drain. Next step is to get vehicle up on stands and try to move that bundle to check for fluctuations in the draw.

One other question, could an alternator cause this drain? It seems to charge fine. As long as I run the vehicle every day it is okay and the voltage at the battery when it is running is about 14.5 volts.

I seem to find that the general concensus to a "normal" drain should be no more than 50 mA. Your thoughts. Does anyone have a vehicle they could check?

Any help would be greatly appreciated, thanks in advance!!
 
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