Join Date: Oct 2016
Location: Lake Erie
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Re: Starting Circuit Mystery (why won't my engine crank?)
Have you actually removed lugs from bolts, mechanically cleaned all surfaces, washers and lugs' ? (Unless the alt is energized ,,by the key,, start/stop the engine by independent curcuit should not cause a diode blowing surge. Having a button in the engine area can be handy for bleeding and other testing)
I haven't done any cleaning so far, as (until this discussion) I didn't seriously consider corroded contacts to be a possible cause. Because (a) they don't _look_ that corroded and (b) I was assuming the amperage required to trigger the solenoid was low enough that a bit of corrosion wasn't going to make much difference.
If that's not the case, then cleaning the contacts is probably a good thing to try.
A little internet searching suggests using vinegar+salt to remove the corrosion, then neutralize the acid with baking soda. This sounds like a better idea than trying to sand everything. Thoughts?