Having problems with your 1990 Ford F150 ?
1990 ford f150. Lost headlights, interior lights, dome light, elc radio control buttons, cigar lighter. Running fine otherwise. I notice the headlight switch feels a bit stiff or odd when I push back in on it, but no lights come on at all, also when the door opens no interior lights. the radio comes on, but that is all, no elc controls, and the cig lighter and horn also seem to have lost power. All fuses under the dash are good. I'm not sure where to start looking to find what has blown or short
There are fusible links (about 3) that come off the power side of the solenoid and run behind the battery. It you had a short or something these links burn out. You must replace the wire.
Check the fuseable links at the solenoid for power both ends,maybe replace the headlight switch
Repair Help & Product Troubleshooting for 1990 Ford F150
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