How do the voltmeters work in these trucks?
I'm holding two instrument clusters.
An '87 cluster has three pins on the back of the voltmeter.
A '91 cluster has an ignition hot and a ground going into the voltmeter, and a separate wire going to the battery light. It looks like the battery light needs to be grounded through that wire in order to work. I may have misread the printed circuit, though.
How does that three-pin voltmeter work? How does the battery light work?
I'm working on a LS swap, and am trying to literally merge the old and new harnesses, including the new underhood fusebox.
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