Electrical Problems
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5th Wheeling
Joined: Aug 2005
Posts: 46
Likes: 1
From: IL
Electrical Problems
Hello,
I have an '88 F-250 2wd 5-speed. My problem is that the truck drains the battery in less than twelve hours. I put a new battery in it yesterday, and it is almost dead this afternoon. There are no obvious things on such as a light, radio, ...etc, but something is draining the battery. This is something that has just occurred, as the truck sat all winter then started with full cranking power this spring.
I am fairly electrical savvy, but before I go through the trouble of tracing every wire to find the one that is drawing the juice and then tracing that circuit to the device drawing the power, I was thinking maybe someone has had this problem before and could make some suggestions that I could check into first.
Thanks,
Matthias
I have an '88 F-250 2wd 5-speed. My problem is that the truck drains the battery in less than twelve hours. I put a new battery in it yesterday, and it is almost dead this afternoon. There are no obvious things on such as a light, radio, ...etc, but something is draining the battery. This is something that has just occurred, as the truck sat all winter then started with full cranking power this spring.
I am fairly electrical savvy, but before I go through the trouble of tracing every wire to find the one that is drawing the juice and then tracing that circuit to the device drawing the power, I was thinking maybe someone has had this problem before and could make some suggestions that I could check into first.
Thanks,
Matthias
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5th Wheeling
Joined: Aug 2005
Posts: 46
Likes: 1
From: IL
I had given that some thought, but with truck running I had 14.4vdc. But, the truck does not charge enough to keep truck running with the lights on. So if it is the alternator, it would make some sense.
I report back tomorrow.
I report back tomorrow.
Fleet Owner
Joined: Oct 2005
Posts: 20,783
Likes: 1,750
From: Kentucky
One of the bridge diodes can short causing a a constant drain on the battery without the engine running. A shorted diode in the bridge will result in low charging output (half-wave). A view on an oscilloscope of the output will show if that is the cause in a few seconds. A quick check with a DVM will typically show a large AC component of what should be a DC output. Pull the alternator and have it tested if you do not have access to those kinds of tools.
Senior User
Joined: Mar 2012
Posts: 153
Likes: 0
From: Bermuda Dunes, CA
If you take it somewhere to be tested, test it on the truck. When they bench test, they don't test for amperage output, just voltage, whereas on the truck, they will also test for amperage. But given what you've said, probably the alternator diode pack has gone bad.
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