Another Mopar Off My Bucket List - Barracuda Fastback

Ooh, that would hurt, killing your car on the side of the road getting a jump from a passer-by.

My guess is that some chargers may have an output voltage that is too high before t is connected to the battery. Once it's charging everything's fine but that first initial transient is enough to fry the voltage regulator in the MSD.

You could probably save the MSD by adding an external TVS diode from plus to minus. I'm on my phone right how so it's a little difficult for me to look one up and make a drawing but I'll try to remember when I get home.

Do you know what the MSD spec says for input voltage range?

I'm not sure if Radio Shack went out of business but they would probably have the part for less than a dollar.