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Problems with plow lights!?!?

Discussion in 'Commercial Snow Removal' started by Cutter1, Dec 8, 2000.

  1. Cutter1

    Cutter1 Senior Member
    Messages: 243

    We are having problems with our new truck. Its a 2000 Chevy 2500 silverado :) Somehow the lights are messed up and we can't figure it out. THis is confusing so, bare with me. When the plow lights are on the left head light is out. This only happens when it is on low beam. I know its the bulb, already checked that. When you put the high beems on, they work fine. This is the tricky part. When you put the left turn signal on, the head light along with the running lights blink, including the truck head light!! I checked the grounds and connections, so any thoughts would help. I would take it in to get looked at, but we are expecting more snow and don't have the time.
     
  2. John Allin

    John Allin PlowSite.com Addict
    Messages: 1,327

    Trade it in on a 2001.

    Just kidding.

    I can't help you, but if you email Chuck Smith (one of our moderators), he'll probably be able to help you. He knows all there is about plow stuff.
     
  3. finnegan

    finnegan Senior Member
    Messages: 313

    need to know what plow lights you have how many wires come out of them and if you have drl ,let me know this and i can help you.
     
  4. Alan

    Alan PlowSite.com Addict
    Messages: 1,393

    For what it's worth, our newest Sno-Way came with one of those automatic relays that switch over your plow lights when you connect the plow. Since we had an older plow that used the old, low tech, manueal switch and wanted both plows the same, we took otu the relay system and went back to the manual setup on the newer plow. Couple reasons for this, first and foremost, RELIABILITY! It's pretty cheap and easy to keep an extra DPDT switch on hand and you can swap it out in a few minutes. The old system, while low tech, works every time, and if I had to I could hot wire past the swtich and get lights working. Second is cost, the manual switch is well under $10. I didn't price a relay but I know it's gotta be more than that.

    Along the way I discovered that while it looks like a complicated wiring job, wiring plow lights through a manual switch is walk in the park.
     
  5. thelawnguy

    thelawnguy PlowSite.com Addict
    Messages: 1,011

    You have a ground problem. Double-check the connections. Could also be a defective lighting relay not giving a proper ground.
     
  6. diggerman

    diggerman Senior Member
    from Ames
    Messages: 700

    I'm with lawnguy,Do the lights flash together or alternate?If they alternate somehow your turn signals are using your headlights as a ground.One other thing do your headlights come on when your switch is in the running light position,if so your headlights are wired in to your running lights.
     
  7. Cutter1

    Cutter1 Senior Member
    Messages: 243

    They don't come on when they are in the running light position. I called the place where we got the plow. THey also said it was a bad ground. Still looking for it, I'm going to end up taking it in to get looked at. I give up!! THere are so many wires on the new plow set up, compared to the old ones!!
     
  8. John DiMartino

    John DiMartino PlowSite.com Veteran
    Messages: 2,154

    Definetely a ground problem,make sure the ground is good,no rust on connections or corrosion.I have had no troubel with the fisher MM relay system on 2 plows in 7 yrs.I keep everything in dielectric grease,its cheap insurance.
     
  9. CT18fireman

    CT18fireman Banned
    Messages: 2,133

    I noticed that the new meyer lights ground everything through one wire. The old lights used to ground turn signal and running light through plate that held mounting bolt. It might be possible that the lights are using the headlight as a ground or the opposite.
     
  10. John Allin

    John Allin PlowSite.com Addict
    Messages: 1,327

    After careful consideration, my professional opinion is that it must be that little munchkin dude under the hood that is pinching the wires together every time the dink-a-dink routine starts with the turning switch.

    I HATE when that happens and I have to chase him out from next to the battery......
     
  11. Cutter1

    Cutter1 Senior Member
    Messages: 243

    John yours sounds like the best answer. I checked the grounds, found the main ground. Its a white wire that goes right tot he battery. Thats the best there is. I found another one on the bumper, cleaned it, still nothing. The truck has about 5k miles on it, so corrosion isn't a possibility.
     
  12. John DiMartino

    John DiMartino PlowSite.com Veteran
    Messages: 2,154

    Did you pull the headlight assy,and check the connection at the light?The ground terminal might not be getting a good connection,and is grounding thru the high beam wire,or the turn signal wire.
     
  13. Cutter1

    Cutter1 Senior Member
    Messages: 243

    I'll check the connection, but we had the light assembly off.
     
  14. finnegan

    finnegan Senior Member
    Messages: 313

    time to start all over disconnect that side and test all the wires wth a good 12v source then label each wire once you know what it does, also make sure everything is clean and tight.

    good luck.....