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Re: Escort Fog Lights
If your fog lights use 50 watt bulbs, that would be about 10 amperes of current for the pair of them. The wires you use would need to be heavy enough to carry the that current without getting warm, such as #12 wire. This would be for the ground wires as well as the wires supplying the 12 volts to the units.
Though it may be some extra trouble, I would get a relay to handle the actual current to the lights, with a lightweight control wire (like #18 or even smaller) for you to switch them on. One of the hard parts of adding such wiring to a car, is finding a good place to bring wires through the firewall. On my 94 Escort there is a hole beside the brake booster & a little above it, toward the center of the firewall. Using a relay located under the hood would eliminate the need to bring the heavy wires through the firewall, and eliminate the possibility of it shorting out on a sharp metal edge someday.
I have bought such relays on ebay; 30 amp 12 volt relays. Such as item # 400001186805. I like to wire the relays up so one side of its internal coil is connected to the wires going to the headlights. Then the other wire from the internal coil just has to be grounded; using whatever switch you install on the dashboard. The advantage to this is that the fog lights will go off when you turn the headlights off, even if you leave the fog lamp switch in the -on- position.
Good Luck
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