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Driver side low beam

Discussion in 'Ram Trucks' started by fabcraftinc, Nov 14, 2011.

  1. fabcraftinc

    fabcraftinc Member
    Messages: 69

    2005 Dodge 2500 diesel. Any idea of why a driver side low beam will not work? tried new bulb. read some other threads, just looking for additional advice.
     
  2. dm5.9

    dm5.9 Member
    Messages: 59


    Mine is at the dealer for this right now, Service rep said hes seen a lot of them coming in with this problem and thinks that the board can be reset. Im suppose to get it back today and ill let you know what they tell me
     
  3. dm5.9

    dm5.9 Member
    Messages: 59

    Dodge is telling me its my isolation module for my plow causing the problem, If they unplug the headlight from it, and plug it back up stock it works fine. Im hoping its one of the fuses in the wiring harness and not the actual iso. He also told me they have had a lot of trucks with plows have this problem, and its sometimes the board that controls the headlights gets overloaded and trips shutting off the bulb. The board can usually be reprogrammed and that fixes the problem :dizzy: What was wrong with fuses to control the headlights :laughing:

     
  4. fabcraftinc

    fabcraftinc Member
    Messages: 69

    I don't think you have any fuses that protect the lights in your plow system. I am assuming this is not a new install. Did you make sure you have the right iso module for your truck?
     
  5. dm5.9

    dm5.9 Member
    Messages: 59

    Yea its the right one it came off a dodge ram onto my ram, and work for a whole season, at the end of the season is when it started happening. I have the 4 port iso box, I wish I knew someone with an extra one so i could try it before i lay down 300 for a new one
     
  6. cubicinches

    cubicinches PlowSite.com Addict
    Messages: 1,412

    The plug in harness for that style lamp (HB5) go bad often. They get corroded where the wires go into the black female socket on the plug in harness. Often, they looks fine, but they're not. If there is any green around the area where the wires go into the socket, chances are good that the harness is bad. Seen it many times. Harness part number is 26349 for the driver's side.
     
    Last edited: Nov 22, 2011
  7. dm5.9

    dm5.9 Member
    Messages: 59

    So you think its the wire from the iso box to the headlight bulb and not the iso its self? I know the harness is much cheaper maybe ill give that a shot first. Would it be possible to check it with a multi-meter before replacing it?
     
  8. cubicinches

    cubicinches PlowSite.com Addict
    Messages: 1,412

    Yes. I've seen the harnesses for HB5 style lamps fail at least a half dozen times. Thats more than I've ever seen isolation modules failures on all applications combined. Do a simple continuity test on the harness itself.
     
  9. Ref ISO Module

    If the wiring issue doesnt fix your problem I have a 4 port ISO module I bought new because I thought I had an ISO module problem to. It turned out to be wiring for me as well. If you need one I will sell it to you for what I paid for it $150.00
     
  10. Kuzanut

    Kuzanut Senior Member
    Messages: 303

    Happened to the passenger side low beam o my truck. i checked the wiring and there was no voltage coming to the light so I ran a jumper from one headlight across the radiator support to the other headlight for now.
     
  11. dodgesprt00

    dodgesprt00 Member
    Messages: 46

    The newer dodges have a little thing with there headlights. Some engineer thought it would be smart to install a computer operated relay instead of fuses. The computer will detect a fault and if it occurs several times the system will shut down the relay. There is a flash that can be done by the dealership to fix the problem and lower the chances of it happening again. My 2006 went in last winter, the dealer tried to blame it on the plow but when I told them I read about this problem he said"oh" .... Still cost me $100. A dealer is the only one that can fix it, evan the best electrical shop in my town couldn't do it with there computer.
     
  12. R.J.S. SNOWPLOW

    R.J.S. SNOWPLOW Senior Member
    Messages: 892

    Wouldn't a code reader clear this
     
  13. dm5.9

    dm5.9 Member
    Messages: 59

    Hey I will take the iso module if you still have it, Replaced the wire still no headlight. So it must be the iso ports.
     
  14. DAFFMOBILEWASH

    DAFFMOBILEWASH PlowSite.com Addict
    Messages: 1,598

    Does your truck have a TIPM??? Look on the wheel well next to the battery for a box with a ton of fueses and an internal circut board. If you had issues with you front headlights on the plow the system will detect the issue and after 5 trips of the internal breaker shut the circut down for ever.....

    Don't patch this issue for it will creap into other circuts and eventually the truck will stop running. Mine did this last season after a plow connection got some green in it and a circut went to ground through the build up the salt bridge.

    If you have a new Dodge truck for plowing make sure you invest in lots of diaelectric grease and fill every external plug on the truck.
     
  15. dm5.9

    dm5.9 Member
    Messages: 59

    it does, but if i plug the headlight back up to the way it was stock, it works, so it was either the headlight wire from the plow or the iso box, replaced the headlight wire, so all thats left is the iso box
     
  16. cubicinches

    cubicinches PlowSite.com Addict
    Messages: 1,412

    Switch the plugs at the #3 and #4 positions on the isolation module and see if the opposite light stops working.
     
  17. dm5.9

    dm5.9 Member
    Messages: 59

    Got the iso box the other day, replaced it last night that fixed the problem so nice to have both headlights working and be able to see at night.

    thanks for the quick shipping and good price.