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One Low Beam Headlight Not Working

Discussion in 'Fisher Engineering Discussion' started by fordtruck661, Mar 7, 2015.

  1. fordtruck661

    fordtruck661 Senior Member
    from CT
    Messages: 404

    I got back from plowing the other day and noticed that the passenger side headlight on my Fisher MM1 was out. I thought no problem Ill get a new headlight, went and put it in today and still nothing.

    So now I have both high and low working on the truck. When I plug in the plow Both work on high beam but only the driver side works on low beam. I have checked the connections and everything seems to be good.

    I have had this plow on my truck and working for 3+ years.
     
  2. radsrt8

    radsrt8 Junior Member
    Messages: 25

    I also have the same problem. Good bulb but no low beam pass side. Truck says lamp out. Bulb is good. Waiting on where to look next.
     
  3. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,924

    Is this the Iso setup or relay kind?
     
  4. radsrt8

    radsrt8 Junior Member
    Messages: 25

    I don't like jumping a thread. But mines the ISO
     
  5. NHresident

    NHresident Senior Member
    Messages: 285

    i'd say something broke in the 11 hole (#26357) plug on the trk side cable which is most likely BUT if not there id say plow light harness plug IF you have another trk or maybe a buddies Id make sure his setup is working just as it should and if it is id have him drive in just close enough to connect the plugs if ur plow lights do what they should its the trk side cable or u drive into his plow if they don't work again its ur trk side cable etc......
     
  6. plowguy43

    plowguy43 PlowSite Fanatic
    Messages: 5,269

    Had this happen this season. Was the truck side 11 pin harness. Storks had it the cheapest I could find at $130 shipped.
     
  7. fordtruck661

    fordtruck661 Senior Member
    from CT
    Messages: 404

    Its all good I also have a 4 Port ISO
     
  8. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,924

    Ck power out from the Iso....you cked the fuses right?
     
  9. radsrt8

    radsrt8 Junior Member
    Messages: 25

    Well all my power is good. Seems its a or some bad wires at the plug, Its where it goes in the plug, I'll have to get another harness. I was able to move it around a lot and get both the lights to come on or off.
     
  10. fordtruck661

    fordtruck661 Senior Member
    from CT
    Messages: 404

    I also did some testing today and found that I do have power going to the ISO from both headlights. I also have power going out the both headlight. So when I get some more time Im going to do a continuity test on the 11 pin harness.
     
  11. Too Stroked

    Too Stroked Senior Member
    Messages: 555

    You might want to try the simple "wiggle test" on the harness. Turn the lights on and wiggle the harness and the connectors. I'm almost sure you'll find that this will lead to the light blinking on and off - which will lead to purchasing a new harness.
     
  12. radsrt8

    radsrt8 Junior Member
    Messages: 25

    I just bought a brand new one off ebay for 76.00 6.00 shipping.
     
  13. fordtruck661

    fordtruck661 Senior Member
    from CT
    Messages: 404

    I will give this a try.
     
  14. fordtruck661

    fordtruck661 Senior Member
    from CT
    Messages: 404

    Thats a great deal let me know if it fixes your problem. Also if you find another that cheap.
     
  15. fordtruck661

    fordtruck661 Senior Member
    from CT
    Messages: 404

    Just an update. When I did my continuity test I found that the wire for the passenger headlight was bad on the truck side 11 pin wire. So I ended up ordering a new one. Put it on today and am now back up and running. Thanks guys for the help.
     
    Last edited: Mar 15, 2015
  16. On a Call

    On a Call Senior Member
    Messages: 755

    10-4 good to know