electiric choke

[Tawny Demon]

what is a good key on 12v source for an electric choke holley. I've been told that the alternator; would this work? if so how (which wire)

 

[cudajim]

Don't use the alternator output unless it's fused. It's much better to use the hot side of the ballast resistor which comes from the ignition switch.

 

[lou3500]

Don't use the alternator output unless it's fused. It's much better to use the hot side of the ballast resistor which comes from the ignition switch.

That's what i used too.

 

[RedFish]

The blue wire on the alternator and the blue wire on ignion ballast both come from the same source.
Factory added a small electric heat element to their thermal coil choke in 1973. That factory wiring diagram should help.