I have a 68 mustang with a 351 windsor off of a 69 GT 350. I just swapped the alternators out going from a 3 wire 60 amp, to a 1 wire 150 amp. When I hooked everything up the starter wouldn't retract and kept spinning on the fly wheel. I bought a new solenoid for it wired everything back up to what I think is right, and the car would start automatically once the battery was hooked up no key in the ignition. I think the solenoid is bad, so I put the old one back in wired it up and now the car wont even start. Everything will get power: the radio, dome light headlights but it wont start. Has anyone had the same problem, or has a wiring diagram of what the solenoid should look like wired, and what the left over cabling from the old alternator should be done with?

 

my 95 hd the ssame prob. is the wire going from the solenoid to the ingntion hooked up cuz i forgot it and it would do the same thing.