No spark and i can only get 5V at the coil.

there are some 45 year old mopars out here with good original wiring. like my 1970 vs29h0 Duster, I am the 3rd owner, bought it in 1981 for $1000. all original unmolested wiring, original alternator, no problems. then there are cars of all makes that have been owned by monkeys