Inoperative Yellow Light/Ignition On & Red Light Off
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1988 Ford Pickup, 1988 Ford Cab & Chassis, 1988 Ford Bronco II, 1988 Ford Bronco, and 1987 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
- Check computer module connector to ensure it is plugged in. Check 20-amp fuse. Unplug computer module connector. Check resistance between terminal No. 4 and ground. See Fig 1 . If resistance is one ohm or more, check terminals. If terminals are okay, repair open module ground wire. If resistance is less than one ohm, check voltage between terminal No. 7 and ground, with ignition on.
- If there is no voltage, check 15-amp anti-lock fuse. If fuse is good or voltage is between 11-13 volts, check bulb. Replace bulb if defective. If bulb is good, check voltage at bulb socket. If there is voltage, replace bulb. If there is no voltage, check for bad bulb socket, bad connections or defective wiring.