1990 Ford F-150 2WD, 4.9 litre, and vin: Y
The Headlight switch has been replaced after a malfuntion of the old switch. No burnt wire bundles, but the connector at the switch shows heat damage. Here's the Kicker... The Black w/ Yellow and Pink w/ White have voltage as prescribed. I pull the switch out to turn on the headlights, I loose voltage at both wires. This has me baffeled as to why I am losing voltage, so if you have any suggestions i would love to hear them.
With a analog or digital volt meter have the bulb or bulbs disconnected at the socket.Confirm that you have input power supply voltage into the switch,then activate the switch now measure the switched output wires of the switch to the bulbs.If you have the correct voltage from the switch then you have either defective wiring to lamp socket or a bad socket.Notes leadlamps draw a lot of current.Sounds like to me that you have a lose connect either at switch or socket.
The common point for all three wires along with your lighter and door locks is a brown fusible link located near the starter relay. It should have a Black w/Orange wire attached to it and possibly a yellow wire attached to the other end of it. Pull on the fusible link and see if it stretches. You can also check for power on each end to see if it is any good with a testingt or voltmeter. If it is found to be faulty, replace it. If it is found to be good you will have to trace lack of power at the fusible link back to battery or if you have a good link and good power you will have to trace the circuit from the fusible link to the headlight switch and or the fuse box. The next likely place would be the firewall junction block.
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I hope I have the correct information for you. You have to get the rod to come out of the switch right? If so, reach under the dash and get your hand on the switch. On the bottom side (usually) there is a little pin, spring loaded, that you push in while pulling on the knob. This releases the rod from the switch and the rod can be pulled out. That pin is about the size of the head of a screw. It will be on the opposite side of where the electrical connector plugs into the headlight switch. Look at your new switch to see what I mean.
The headlight is easy to remove once you know the trick. That is that you first have to remove the grill in the middle. Look in the back and you will see how the grill is attached and you can remove that first. Then you will have easy access to the 4 screws around the outside of the headlight frame. Remove those screws and turn the bulb ring 1/4 turn counter-clockwise and pull to remove bulb unit. Now you can remove the lamp. To replace, reverse removal procedure. Do not touch the bulb or oils from your finger will cause to it not last long.
This is the curse of the old Ranger. I would use two flat tip screwdrivers to pry them apart and have a friend hold the grey terminal while you do this. If you spray WD-40 or PB blaster on it it may seperate but you run a chance of damaging the electrical connections on the inside of the terminal if you do this. I would just replace the whole headlight assembly it's only like fifteen dollars but don't quote me on that.
ithere are 4 bolts that hold it in...the top 2 are obvious..the others are behind the bumper. the bumper must be removed to acces them...here are the manuals instructions..
Headlamp assembly bolts (3 required)
Headlamp assembly nut
Electrical connectors Removal and Installation NOTE: Make sure the headlamp switch and the ignition switch are in the OFF position.
Remove the front bumper cover. For additional information, refer to Section 501-19.
Remove the 3 headlamp assembly bolts.
To install, tighten to 5 Nm (44 lb-in).
Remove the headlamp assembly nut and the headlamp assembly.
The vehicles affected by this recall are certain ‘92 & ‘93 model year Ford Thunderbirds and Mercury Cougars. The problem; the headlights turn off, then come back on after driving with the fog lights on. Ford is replacing the headlight switch and if necessary the electrical connector for the headlight switch. Repairs for a safety recall are to be performed at no cost to the vehicle owner, even if you are not the original owner. In addition, if the headlight switch was replaced before the recall, the owner is entitled to a refund for repairs. But the owner should still bring their vehicle in for inspection. Why? The replacement part may not have been of the new design.