what is causing battery to drain?

Asked by May 18, 2015 at 03:42 PM about the 1994 Ford F-150 XLT LB

Question type: Maintenance & Repair

Truck would not start
..jumped it w/my car…started fine…the battery in my truck is new.I let it charge off of
the car 20 min. Every thing seemed fine..no warning lights..idled great..tranny went into
all gears..breaks worked…guages all registered. BUT….when i take the jumper cable
from the car off the truck will not stay running and the battery is dead shortly there
after.First thing i notice is the ABS warning light comes on…then airbag warning light!
What ever the cause it
drains power from battery  and the
the engine dies. What is causing this? Truck sat most of the winter and when i drove it
this spring the brakes were some what noisey but quieted down after awhile! I figured
they had to be a little rusty nothing to abnormal! Problem truck is having seems to have
something to do with the brakes! They have fluid and the foot petal pressure seems
normal but thinking the ABS sensor is the culprit! Forgot to mention all fuses seem to
ok.. did not find any that had burned out or broken!
awhile!

3 Answers

217,545

ABS has nothing to do with the car turning off after you disconnect the battery. Sounds like the battery has a shorted cell or your battery cables/grounds are the issue.

16,120

If the engine kills as soon as you remove the jumper cables check the alternator. If it is not working it will not charge the batter and without voltage the engine gets no spark. Also, check the main ground cable coming off the battery to the frame or where ever it is connected for corrosion.

217,545

If the battery and cables are good, you need to check for a parasitic draw. youtube has a good video on finding the culprit.

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