Stop in for a cup of coffee

Mattax said

With the engine off, only two possible reasons the ammeter doesn't move when blower motor and wipers are going.
1. Internally the measuring part is broken but the internal shunt is still good.
2. Electricity is bypassing it - shorting to other wires in this case.


Why all?
There's some legit reasons to do that, but if its just under the dash that's messed up, that may be all you need to fully replace.

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well, the wires going to the tailights are chewed up, guessing from mice. and the engine harness has been hacked up to put in that electronic ignition conversion plus some of the wires such as to the voltage regulator and the alternator, the insulation has dry rotted and is cracked. it actually flakes off in some areas. I'd just feel more comfortable replacing all that. Especially given the melted harness under the dash. Not worth the entire car to save a few hours and dollars.