Join Date: Nov 1999
Location: Palm Beach Gardens, FL
You have to replace more than the headlamp switch. If it's not melted, it's probably okay.
Ford TSB 89-17-11 says this is caused by overheating in the headlamp circuit. You'll need to replace the headlamp and dimmer switches, several connectors, and then bypass the wiring in the circuit with new 12ga wire run alongside the original harness.
If you don't use the fog lights, you will likely never experience the problem.
1988 GT, 57k mi, Orig Owner
ProCharger P600B, FRPP Headers, Flowmaster F2, 3G Alt, Mk8 Fan/DCC, 3.55's, Prog Springs, ST Brace, G/Trac Bar, Subfrms, UCA, LCA, FCA, Tokico 5-ways, C/C Plates, CSA 16x8, Bridgestone RE760 Sport 225/50R16, Megasquirt DIYPNPF60, LC2 WBO2, C&L76mm MAF w/LU47's