93 Ramcharger suddenly died

The coil is new, anout 3 weeks old now. the old, original one was arcing all over the place. No codes at all. no 55, no check engine light. nothing. Speedometer quite at the same time the engine shut down. Can I just swap relays to see if it is the ASD? I think it's the second one closest to the battery from what I have read.
It is a 93 Magnum 318, not sure what EFI it has, but it is injected. I looked and did not see a fuseable link along the fender, but will look again when it stops raining.
I had it towed home, so I do not have to figure this thing out a parking lot.
Thanks!