3 wire gm alternator

[Jim.ME]

How can say a radio work when a switch is in run and also when in ACC if the two aren't tied when the key is in the run position?

My apologies to Janicholson, I misread/misinterpreted what he posted. Yes, the internal disc contact points on the rotary disc turned by the key (of at least some switches) connect just the battery and ACC terminals when turned left to ACC position. When turned to the right, ignition, there are contacts on the disc that connect with the battery, ignition, and ACC terminals. The contact that mates to the ACC terminal when turned to IGN is a different contact than the one that mates with the ACC terminal when in the ACC position.


This post was edited by Jim.ME on 03/24/2023 at 04:38 pm.

 

[Duner Wi]

It's done internally. Thats the magic of a
3 position switch. What you describe is a
2 position switch.

 

[JMOR]

(quoted from post at 10:13:43 03/24/23)

(quoted from post at 01:59:23 03/24/23) Please post diagram

I have diode

This post was edited by JMOR on 03/24/2023 at 11:54 am.

ever mind, the connection I added on right to alt warning lamp already exist in original drawing, as here.

 

[ford 2600 in maine]

Thanks for all the help.