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

there is a relay. go to autozone and buy a haynes manual.

Thanks for the reply. Is there a separate relay for high and low beam?

im not sure, but i think so. id go look but mines at the alignment shop.

read page 209--- then download the book

http://www.motorcraftservice.com/pub.../02f12og4e.pdf

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.

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.

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

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.

No power to ether fuse 26 or 28. I checked it with the head light switch on. I will open up the MFS next.

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