Cranks but won't start. Unplug ground at field spade on Alternator and it starts?

Dana67Dart said

What car?
What year?
What modifications?

Post a photo of back side of alternator and of the voltage regulator



Everything worked as expected till you changed the alternator and voltage regulator.

Now starting is acting like you do not have voltage from IGN 2 while cranking.

Give us some more info and we can move forward

Click to expand...

1969 Barracuda
All wiring is factory specs

New alternator and voltage regulator worked for two weeks then developed a no start issue.

Coil gets 8 volts when cranking. If I disconnect ground on spade connector on two week old alternator car gets full voltage at coil and fires immediately. I had local parts store order stock replacement alternator. What showed up was a two spade field alternator and I ground one spade to alternator body which worked flawless for two weeks. NAPA '69 stock replacement voltage regulator.

I get some pics tomorrow. But its a stock wiring stock replacement parts setup. I do have Unilite distributor been on there for 14 years and it gets power for Ignition 1 side of ballast resistor. Unilite igntion module and MSD High Vibration coil mounted in stock bracket on manifold.

Like I said in orginal post, new alternator and voltage regulator were fine for two weeks. Stopped to get gas all the sudden no start issue occurred.