Crikey???? what brand setup are you using????
Mine is a Narva setup. It has a stand alone wiring harness, I do not touch any of my original headlight wiring loom. The relay has simple setup. Main power - from battery, Earth - to body/battery earth, left and right power supply to each spotlight ( each spotlight is individually eathed to my bullbar) and the Activator - via the isolator switch. The only wire to come thru the firewall is that relay activator.
That RED wire you see in my pics goes from Fuse box to isolator in - isolator out, thru the firewall and to the relay actiator. I take it maybe your isolator switch has a light in it as that could account for a third wire.??
It's a stand alone system that does not reley on the original wiring at all, it draws no amps any from your existing lighting and in the event of a "short" won't burn out you headlight wiring. A fairbit safer and than piggy backing off the original lighting harness.
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