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 headlights are not fused, you likely have a switch problem. Pull the headlight switch out and check for burnt wires at the connector hard shell. If problems are found replace the headlight switch and the connector. The repair connector is available from local suppliers the headlight switch is also, both are fairly cheap parts to buy.
FIRST CHECK FOR BURNT FUSES...IF OK CHECK HEADLIGHT BULBS OR SEALED BEAM....MAKE SURE THE CONNECTORS ARE NOT CONTAMINATED...(SOME HAVE GREEN LOOKING SUBSTANCE IF THEY ARE CONTAMINATED....IF THIS IS PRESENT REPLACE.....
IF FUSE'S/RELAYS/AND WIRING ARE GOOD PROBLEM LIES AT HEADLIGHT SWITCH.
Open the hood of the truck and locate the two screws on the top of the trim bezel. Remove them with a Phillips screwdriver then move to the front of the bezel and locate the four screws in the face of it. Remove them with your Phillips screwdriver and set them aside.
Pull the trim bezel off the front of the truck and set it aside. There are three clips along the bottom edge of the bezel; they may require you to pull harder than you think you should but they will let go if you pull hard enough.
Locate the four screws at the corners of the headlight assembly. Remove the screws with a Phillips screwdriver then pull the headlight assembly toward you until you can reach the headlight bulb connection on the rear off the assembly.
Release the locking tab on the headlight bulb and pull the wiring harness connector off the bulb. Set the harness aside and remove the headlight assembly off the truck.
The 'blower motor resistor' burnt out. Located up under the dash on the passengers side. Wire bundle with 4 or 5 wires goes into it, and 2 1/4" screws hold it in. You will be able to see that the resistor is burnt, rusted, or just broke off. May be the coil-spring type, nevertheless, you will be able to tell if it's burnt. Replacement is about $25 - $35 at your local parts store.