Posted by Zane on 3/7/2005, 7:23 pm, in reply to "1980 528 problems electrical" The E12 alternator is kind of weak on the output side of things. There is available an adjustable voltage regulator for these alternators. You can adjust the voltage upward to 16v. The Volvo crowd sells these units--works great.
12.78.0.19
I would say that a good flush of your fuel system is in order, new filters---fluids, in fact, for the whole car. There is a known issue with the ignition switch killing the battery. I would suggest loosing the toggle switch, put everything back to a factory spec and then take off the Neg cable, jump a test light between it and the body and then pull fuses until you determine what is pulling a charge. At least you will have an idea as to what is doing what, narrowing it down, so to speak. Sometimes it can be as simple as a stuck trunk light or a clove box light :o)
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