Posted by Gordon on Wednesday, February 25, 2004 at 8:58AM :
In Reply to: Dimmer switch wiring posted by Ron M. on Tuesday, February 24, 2004 at 11:37PM :
It's an either / or switch, one output to main beam , one to dipped.
On the earlier trucks, there were two outputs from the main lighting switch to the running lights, so that the rear running lights stayed on regardless hen the switch was out, but the running lights on the cowl went out when the headlights came on.
Gordon