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Headlights only work on high beam

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Old 07-16-2010, 12:19 AM
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Headlights only work on high beam

I bought a 97 f150 stepside. I have been working on a few problems on the truck. One problem I can't figure out is the headlights. There is no power going to them on low beam. Is there a fuse or relay that could be out. I don't have an owners manual. Thanks
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Old 07-16-2010, 07:21 AM
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there is a relay. go to autozone and buy a haynes manual.
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Old 07-16-2010, 07:24 AM
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Thanks for the reply. Is there a separate relay for high and low beam?
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Old 07-16-2010, 07:28 AM
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im not sure, but i think so. id go look but mines at the alignment shop.
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Old 07-16-2010, 10:36 AM
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read page 209--- then download the book

http://www.motorcraftservice.com/pub.../02f12og4e.pdf
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Old 07-16-2010, 04:47 PM
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Originally Posted by 93 mix 'n match View Post
there is a relay. go to autozone and buy a haynes manual.
Uh, NO!. There is no relay in the low-beam (or high-beam) circuit on a 97.

The output of the MFS (Rd/Bk wire) splits to two separate fuses (under-dash F28 and F26) that individually protect the left and right low-beam headlamp circuit. There is nothing else in the circuit.

Check the output of the MFS at the two fuses.
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Old 07-17-2010, 12:12 AM
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Thanks for the replies. I checked the fuses and they are ok. Tomorrow I will check the voltage at the fuses. If nothing there I will disassemble the MFS.
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Old 07-17-2010, 01:17 AM
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there is a chance that both headlight bulb filaments have gone on high beam, maybe one went a wile ago and you didnt notice, or it is your actaul switch
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Old 07-17-2010, 09:46 AM
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Yep, there is a chance that both bulbs have gone. The voltage check at the two fuses will give him guidance on which half of the circuit has the fault.
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Old 07-17-2010, 12:08 PM
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No power to ether fuse 26 or 28. I checked it with the head light switch on. I will open up the MFS next.
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Old 07-17-2010, 01:14 PM
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Fixed !! I disassembled the MFS and cleaned all the contacts with a scotch brite pad and electronic cleaner. Then I put a thin coat of dielectric grease and resembled it. It is working great. Thanks everyone for the help.
Budman
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