No codes on Durametric, but I can't find anywhere in Durametric to scan electrical system, ..Help?

Could be the voltage regulator or a marginal charge rate.

My suggestion is a FREE charging system test including load test at Pep Boys or most any parts store that sells batteries.

Jim

Put a voltage meter on the battery and see if it's holding its charge with the engine running under a load, like with the lights and AC on. If not it's likely something wrong with the alternator. It's indicated by a steady lowering of voltage output.

Those test systems at auto parts stores won't always pick up on a faulty regulator. I took my bad alternator there and it passed the test. Yours could be a bad regulator but you don't really know and won't unless you replace it and reinstall the entire unit to see if it works. Kind of a PITA.

Good luck finding this Doc, at least you didn't have any CEL's after the recent upgrades.

Could be worse, dont' think this is from upgrades...knock on wood!