Over night Battery Drain - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 05-20-2011
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Icon9 Over night Battery Drain

Any Ideas on what is causing this over night battery drain? I can drive around all day doing shopping chores and such and truck will start all day long, but, park it at night, and will not start in the morning.

Have done the test with the light to the battery ground and positive post with the ground cable disconnected and there is no indication of a draw.

What else should I check, where else should I look...

A curiosity occurred a while back when it was doing the same thing I am describing now...I was disconnecting the negative cable when parking the truck to save the battery, then when I was away the battery was stolen out of the truck, I won't go into the Homer Moment, that caused that to happen. Subsequently I had to purchase a new battery, and the overnite drain abated, now I know that some might say...well sure it was a new battery...but, it never drained away for over a year until I parked the truck this past winter.

I charged the battery with a trickle charger for about 36 hours until the charger indicated that it was full, then put it back into the truck, and my over night drain returned.

I am baffled to say the least, I should also mention that vehicle electricity has always been a challenge for me, so short of taking it to an auto electric shop for diagnosis, any information you provide for me here is most certainly appreciated, but, needs to be very specific.

Thank you all in advance for any information that will save me any time and money, and rid me of this extremely annoying problem.

Later...

A PS: to the above, this also started when I had the transmission rebuilt, and installed a new clutch, a removal and reinstall I did myself.
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Old 05-20-2011
bonez's Avatar
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this happened to me the other day...i accidentally left the high beams pushed forward...even though my lights were off...it drained my battery....just a thought..?
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Old 05-20-2011
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'didnt happen till this past winter'


You're battery died during winter and is now in effect, dead, won't hold a charge, hell I bet if you take a multimeter and watch the battery you can see the volts drop by the minute. Go have the bat tested but I bet its dead.
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Old 05-20-2011
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You need a multimeter that is capable of measuring amps to test for excessive key-off draw. Anything over 50mA is too much. You hook the leads of the multimeter in series with the battery positive terminal and the positive battery cable to perform this test.

To find where the draw is (after you have verified that you have a key-off draw), you must divide and conquer the electrical system of the truck. With the multimeter hooked up and showing the draw, start pulling fuses. When the draw goes away, you have found the culprit circuit. Divide and conquer again. Test each part of the circuit, see what is drawing power.
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Old 05-22-2011
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Quote:
Originally Posted by Murphy View Post
You need a multimeter that is capable of measuring amps to test for excessive key-off draw. Anything over 50mA is too much. You hook the leads of the multimeter in series with the battery positive terminal and the positive battery cable to perform this test.

To find where the draw is (after you have verified that you have a key-off draw), you must divide and conquer the electrical system of the truck. With the multimeter hooked up and showing the draw, start pulling fuses. When the draw goes away, you have found the culprit circuit. Divide and conquer again. Test each part of the circuit, see what is drawing power.
That post should be a sticky. I've seen this question way to many times.
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Old 03-22-2017
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Location: Moyock, NC
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This thread helped me solve my electrical issue with my ford ranger. Here's the scenario. I woke up one Friday morning with a bone dead battery. First issue I've ever had with it. I drove a different vehicle to work and that afternoon charged the battery. The next morning it was dead again. Went to Advance and bought a new battery and installed it. From Saturday to Monday morning the truck was not touched. I went to crank it Monday morning to drive to work and it was bone dead again. Bottom line, I had a significant drain and I narrowed it down to the relay that engaged my AC clutch. How I discovered this was I put my battery charger on the battery and I heard an audible "click". I disconnected the charger and touched the post again and "click". It was the AC clutch. I thought I had left the key on but no, everything was off. I replaced that ten dollar relay and all is well.
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