90 Legacy 2.2 - Starts OK, then dies when electrical is demanded, especially when warm

I would start by having the battery voltage output tested. Looking for 14 volts.

-- Message posted using

I'd get a load test done on the battery (how old is it?) and have the alternator checked out.

Symptoms seem consistent with like something is shorting to ground under higher current draw/heat conditions. Could be a cell shorting in the battery, insulation on windings of the alternator failing under higher heat, or the voltage regulator's p/n junctions saying "17 years is just too damned long."

-- Todd H.