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Re: electrical problem?
Have you checked the voltage at the battery with the truck running? At about 1200-1500 engine RPM you should have a minimum of 13.7 yolts to around 14.5 at the battery. The older style w/external regulator will charge a bit lower than the later internally regultaed type.
A normal operating system should charge a battery and maintain it's charge.
it is also possible that your battery could be weak or have a shorted cell. If possible, have the batery fully charged and have it load tested. A battery cannot be tested without being fully charged.
Hope that is helpful
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