1991 Dodge Ram inconsistent starting

Do you have spark
I would suspect a bad coil at 1st

Welcome to the forum, there shouldn't be any voltage to coil with key off, that voltage comes from asd relay. When there is voltage on the positive side, there should be steady voltage on the negative side as well, without engine cranking. Take negative primary wire loose from coil, do you have voltage on both primary circuits, now? With testlite on negative side side of coil, engine cranking, the lite should pulse.

Are there any trouble codes? You should be able to get mil codes by cycling the ignition switch. You turn key till dash lites come on, no further. Cycle key, on--off, on--off, on, then the the check engine lite starts flashing, you count the flashes to get the codes. Your lookin for two digit codes.

Sorry BMRFIXIT, I didn't see your post before hand.

Quick observation: I'll bet he had the test light "grounded" on the battery positive post. I doubt there was voltage on the coil with the ignition switch off. If there was, he'd be discussing a battery drain. I've mistakenly grounded my meter or test light on the positive post before, ... And we all know what an expert I am! :)

caradiodoc

Hi caradiodoc, I seen you around, you give good information. I've hooked things up the wrong way, so many times, I lost count. Have a good day.