Originally Posted by FriendlyFire
I appreciate the info. I think I understand the concept, but I'll admit, wiring is not my forte.
So is the function of cancelling the fog lights integrated into the switch?
Sorry to be dense, just trying to understand how the system works. Please forgive my ignorance
So the relay would send 12v to the fogs instead of an open circuit? (right?) Can that "switching" of voltage sources be avoided?
Ie: the fog lights are already receiving power, then the highs are activated and power is removed from the fogs, then the relay kicks the voltage back on. (with the modification you mentioned)
I guess what I'm asking is is it possible to just bypass that function altogether so that power to the fogs is never interrupted, or would overriding it via a relay as you mentioned be necessary?
Thanks! I appreciate the info, even if my grasp of it is tenuous.
As the power to the fogs is controlled electronically by the LCM ( Lighting Control Module ), you would have to rewire something in the dash, which would then invalidate the switch function, something you want to avoid.
When you switch to high, the power to the fogs is disrupted, you have to replace that power with another source of power, hence the relay. If you are a real electronics guru, or can find a solid state 12v SPDT replacement for a relay in Google ( kinda hard to find with enough amperage to do the joib ) - this would eliminate the approx 2-20 millisec delay
see this link for a relay primer :
Relays
NOTE: I used the bosch 30amp relay 10 years ago on my old 1990 Suburban to make the low beams stay on when you switched to high. Still working fine ...
ANOTHER NOTE : IF YOU USE THE RELAY AS DESCRIBED ABOVE, THE FOGS WILL BE ON WITH THE HIGH BEAMS REGARDLESS OF THE FOG SWITCH POSITION !!!