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Re: 93 LS Wiper Issue/ Possible Electrical Problem...
The light problem sounds like (obviously) a ground issue.
AWG4 for a 220A alternator is too small.
Make sure the HO alternator is not outputting more than 0.2VAC on the system. DC electronics don't like much AC contingent in their power source, and HO or altered alternators can impart a lot more AC than that. The capacitance of even two batteries may not be enough to filter the AC.
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