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Check impedance across alternator switches and master
While the resistance across the contact may show fine with a DVM, under load they aren't.
While these only have an amp or so running through them, anything less than perfect and they act like resistors, which allows voltages to jump around all over the place!
If you pop the switches out from behind, you may find a volt or more across the CLOSED contacts. No kidding.
You can pop switches out, then just blast like crazy with cleaner (brake, contact, corrosion X), while cycling them a few bazillion times.
Re test until voltage drop os at or near zero.
From personal experience, I am making a $1 bet this will solve your issues.
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David Wartofsky
Potomac Airfield
10300 Glen Way
Fort Washington, MD 20744
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