D/C ground connector at battery.
Open aux relay box, remove, tape/insulate tip of red with black tracer connector and secure to other wires (no flopping around inside).
Add wire as illustrated. Many choices....with/without fuse, if fused 1A is fine. Thick wire so it takes up all space inside slots and stiff enough so it won't wiggle off.
Even go up top with the added wire, after removing, insulating n securing connector.
Go with thin wire cram at Inverter Relay slot 1 then insert relay.
Wrap other end to free unbent prong of fog relay.
Insert back into place.
Fogs ON with switch anytime vehicle is ON. OFF at vehicle OFF if one forgets to switch off.