Question about 1990 Ford F150

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Headlight switch Electrical..

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.

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  • myaircraft Jan 24, 2009

    My mistake on the colors of the wires, looking at the wrong sheet of paper, The ones coming into the switch with voltage are Black/ Orange, Tan/ white, light green/ yellow. All three have voltage until the the switch is turned to the ON position.

  • myaircraft Jan 27, 2009

    AT the fusible link by the starter solinoid, someone had directly wired the Blk/ Orange wire to the battery terminal, which was very corroded, and the switch was not getting enough amperage through the wire. Placed the wire back on the solenoid, and installed a new fusible link, OPS Checked good, all lights work. Thanks fr the helpful hints, and your time..

  • steven_e55 May 11, 2010

    Which lights are not working? The wires described have nothing to do with headlights or park lights


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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.

Posted on Jan 24, 2009

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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.

Posted on Jan 24, 2009

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