The kit I used is Ford part # 1L2Z-15200-AA. The kit switch has 3 wires - 1) black - ground; 2) white - from headlight switch and; 3) blue - to post 85 on the "fog light relay". The original switch has 4 wires - 1) "fog light on" indicator; 2) switch illumination; 3) ground ; and 4) fog light relay.
Any ideas?