Cranks but won't start. Unplug ground at field spade on Alternator and it starts?
This suggests that IGN 2 is not able to provide the bypass it is designed to do.
99% of grounded field (round back) alternators are coming from the rebuilders as a isolated field (square back) with one terminal internally grounded. They clip off the spade terminal but leave enough of a terminal there that many have put field terminal on it and fried their voltage regulator.
Arrow points to trimmed terminal on the GROUNDED field terminal.
This suggests that IGN 2 is not able to provide the bypass it is designed to do.
Can't say for sure but...
99% of grounded field (round back) alternators are coming from the rebuilders as a isolated field (square back) with one terminal internally grounded. They clip off the spade terminal but leave enough of a terminal there that many have put field terminal on it and fried their voltage regulator.
Arrow points to trimmed terminal on the GROUNDED field terminal.