SOURCE: 1st time install of OEM fog lights into a 1999 Mercury Cougar?
Look under the dash near where the headlamp switch mounts and if yours is equipped you should see I think it is a blue 4 pin connector with the following wire colors OG,OG/WH,OG/GN,BK.
This is for the fog lamp relay.If yours has this connector then you will need to purchase a relay ford part number F6RZ-14N089-AA should list for about $10.
SOURCE: Wiring for Bosch Hologen Fog Lights? Wiring
Look on the relay for the terminal numbers.
Terminal 30 goes to the battery positive.Red Wire
The two terminal 87 go to the fog lights.Black Wires
Match the color wire with what you have on the relay connection for the rest of the wires.
Terminal 86 should connect to your low beam headlight.
Terminal 85 should go to the fog light switch.
The fog light switch should connect to the terminal 85 and the other terminal on the switch will connect to ground.
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