Question about 1986 Ford F 250
Check your voltage regulator. (Most likely built into the alternator). When the regulators go, they pull voltage even when the vehicle is not being used. Two ways to check the regulator: Pull the alternator and take it to an auto parts store (most test for free). The other way (if you don't want to pull it) is to use an ammeter and see if it's drawing current while the ignition switch is in the off position. If there is current showing, the regulator is on it's way south. If you have an actual volt gauge in the truck, you may see it jump around or drop way down when you crank the engine. If so, that's a symptom of the regulator as well.
Posted on May 13, 2010
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Posted on Jan 02, 2017
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