Gen/Fan light issues in LM

[aslondon]

This is a 65 Monza issue. The speedo didn't work (separate issue) so I got a used cluster and swapped the whole thing. All was well until the gen/fan light stayed on when the key was off. I could hear the voltage regulator de-energize when I disconnected the battery so I assumed that was the issue. I replaced the voltage regulator and solved the light staying on problem but now it won't come on at all when I turn the key on except if it is to the ACC position. I have tried putting the old cluster back in and it does the same thing. I have tried another new voltage regulator no change. The pressure/temp light works normally. Both wires to the Gen/Fan light show hot so it would seem that something has to go to ground that isn't. Thinking maybe a new ignition switch? a stuck relay? I really don't want to just throw money at it until I have changed everything. Any suggestions are greatly appreciated. Tearing my hair out (I don't have too much to spare!)

Al