You should generally wire terminal 85 to ground or switching to ground and positive control voltage to terminal How to Wire a Relay Here's a very simple sample. Picture on the left is a Diode relay, these are generally better at stopping electrical noise from the relay coil. If it helps, think of the wires a bit like plumbing pipe. How this all happens is as follows - The voltage can't get to the fog lights since the relay circuit is open.
If wired in parallel, one relay can fail and the other can continue to operate.
To submit your questions or ideas, or to simply learn more about It Still Runs, contact us. A warning light could easily be added in parallel to, or used instead of, the buzzer.