This is wildly off-topic for RAMJ+W and my abject apologies are offered. My address above is valid if you prefer to reply off-group. I'm only asking here because you guys know your stuff, I trust you and I don't do this very often.
I'm helping a friend with his motorhome, which was built on a 1990 GMC chassis with a big-ass V8. I know that it had a reverse-polarity episode with a completely dead battery and some poorly-designed jumper cables (black cable ends in red clips, yellow cable ends in black clips, a mistake just waiting to happen). A new battery later it cranks but does not start. I haven't seen it in person yet.
I'm guessing that the reverse voltage took out the ignition computer, would this be likely? I plan to meter the coil primary side and look for voltage and pulsing during cranking to be sure. Anything else likely to have let out a little Magic Smoke, like alternator diodes or voltage regulator? I'm hoping to prevent cascading failures once I get it started.
Thanks in advance,
Lee