Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
I see you haven't been attended to as yet.
You will need to add an additional switch in a convenient location on the dash in place of one of the switch blank plates. It will then need to be wired to the foglamp relay.
Depends on how you want them to function as to which way it will be wired.
Are you using the foglamp relay in the underhood fusebox?
Or another separate relay?
I will see if the GM website will give me the circuit diagram later.
It would not allow it about 1/2 hour ago.
I think GM and Isuzu are near the same electricals.
Not the same car, but you can see how the fog lamp relay is grounded by the BCM.
Until we can locate a correct diagram, it would be best to do all of your installation, lamps etc, and get a Isuzu tech to wire the inside part.
Might be safer that way, and you won't blow up the BCM.
Hope this helps.