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Antnee77
01-17-2006, 06:18 PM
After installing my MM2 on my 03' 2500HD, one of the low beam lights does not work on the truck assembly (the bulb is fine) and the high beams do not work on either the plow or the truck. Any ideas? It's strange, I know, but it's bothering me. Any help is appreciated!

ticki2
01-17-2006, 06:33 PM
Does your module have a green or yellow label?

Crash935
01-17-2006, 07:24 PM
Was this a new install or a swap? If a swap, what did it come off of?

Stark_Enterprises
01-17-2006, 08:34 PM
I think this was a popular problem...bring it to a dealer it just might be some type of jumper..

Antnee77
01-17-2006, 10:06 PM
I truly hope it isn't the isolation module. The entire setup, except for the module, is from a 2002 2500HD. The isolation module is from an 03- Dodge Ram 2500/3500. I was told that it doesn't matter which isolation module you use.

ticki2
01-18-2006, 03:10 AM
Pretty sure it's the module , you need the green label , pn#27781. You need to check with dealer , Dodge and Chevy are different.

Crash935
01-18-2006, 05:37 PM
Its a combination of the headlight harness' and the isolation module. A 02 GM used a 26361 (short harness) and a 26360 (long harness) with a 27781 iso mod while a 03 GM uses a 26351 (short) and a 26352 (long) with a 27781 iso mod. The dodge uses a 26400 iso mod.

The harness' can be saved by moving some wires around, and as i sit here staring at the chart, knowing what has to be done, it just doesnt make sense right now, was up all night salting, if i get a few ZZZZ's i'll be good to figure it out. You will have to change the iso module though.

so heres your options, spend a hour or so switching wires and still have to get the right iso mod, or get the complete kit with all the right stuff ready to plug in.

I can tell you that list for the whole kit is $273, if you buy it in pieces its $76 for the short harness, $86 for the long harness and $223 for the iso mod. If you buy the whole kit you also get the harness the plugs into port #2 on the iso mod (lighting harness).

Antnee77
01-18-2006, 09:17 PM
Well I was just driving the truck, and I came to realize (stupid me) that no matter what, when the light switch is either on Auto or on Low Beam, the highs AND lows come on. So now, I can either have my lights completely off, or both sets of high and low beams on all at once, except for that one low beam bulb that doesn't work. I guess I'll be getting a new Isolation Module from a friend and then I'll be screwing around with wiring for the headlights. :mad:

Antnee77
01-21-2006, 08:18 AM
Its a combination of the headlight harness' and the isolation module. A 02 GM used a 26361 (short harness) and a 26360 (long harness) with a 27781 iso mod while a 03 GM uses a 26351 (short) and a 26352 (long) with a 27781 iso mod. The dodge uses a 26400 iso mod.

The harness' can be saved by moving some wires around, and as i sit here staring at the chart, knowing what has to be done, it just doesnt make sense right now, was up all night salting, if i get a few ZZZZ's i'll be good to figure it out. You will have to change the iso module though.

so heres your options, spend a hour or so switching wires and still have to get the right iso mod, or get the complete kit with all the right stuff ready to plug in.

I can tell you that list for the whole kit is $273, if you buy it in pieces its $76 for the short harness, $86 for the long harness and $223 for the iso mod. If you buy the whole kit you also get the harness the plugs into port #2 on the iso mod (lighting harness).

Where can you even buy the short and long harnesses for ports 3 and 4 on the iso mod? Everyone I talked to said that you have to buy the whole kit with the isolation module.

Crash935
01-21-2006, 01:55 PM
Tell your dealer to just order them as individual items, They are listed in the master parts list as an orderable part.

There is a way to change the harness' you have around but the info isnt listed on westerns site and i dont think i would be able to explane it to you on the board. Let me take a look at it when i have a few minutes of sleep, got 4-8" last night of the we heavy stuff and spent 13 hours in the truck and have been up 30+ hours, can we say "nap time".

Antnee77
01-21-2006, 11:14 PM
Tell your dealer to just order them as individual items, They are listed in the master parts list as an orderable part.

There is a way to change the harness' you have around but the info isnt listed on westerns site and i dont think i would be able to explane it to you on the board. Let me take a look at it when i have a few minutes of sleep, got 4-8" last night of the we heavy stuff and spent 13 hours in the truck and have been up 30+ hours, can we say "nap time".

Lucky you, getting all that snow. :p

Catch some :sleeping: and then see if you can figure out which wires will have to be switched. I appreciate all your help!

Crash935
01-22-2006, 11:20 AM
Okay, i've looked at the schematics again and i think we can get away with just switching 2 wires on the plow side headlight harness where it plugs into the factory headlight plugs. What they did was changed the common leg in the truck side harness, the bulbs dont care what side is common so i'm thinking as long as we send the right signal back to the iso mod we should be good. But i want to try seeing what happens when you change the iso mod to the correct one. Havent done that yet have you?

Other porblem is, i have to leave in a few hours to run a load down south, not sure if i will be back Mon night or Tues night, so it will be a few days before we can get this all straightend out.

Antnee77
01-22-2006, 08:52 PM
Not a problem, man, I really appreciate all your help. I am going to try and get the Iso Mod. tomorrow and we'll see how things go. Thanks again!

Crash935
01-23-2006, 09:51 PM
I'm back and i actually found the same info on westerns site that i'm looking at (now if i can just remember where it was). I will find that tomorrow eve (tues) and get it to you. Let me know what happens when you plug the other iso mod in.

Antnee77
01-25-2006, 03:46 PM
Sorry I haven't written back in a while.

So after actually getting a couple of inches the other day, I managed to finally get down to my buddy's shop to try and swap out that Isolation Module. Turns out the Isolation Module that came off the truck that my harness was on is actually either a 26400 or a 26401. I got the whole harness setup from him, and that came off a 2002 2500HD, but he didn't give me the Isolation. I used my 26400 Isolation and that is why I had the original problem. The only Isolations that he had in his shop were 26400's and a 26401 (yellow label). I tried the 26401, but I knew it wouldn't work. The number on the serial of the Chevy Isolation is 27781? Now I'm in a bit of a pickle.

Crash935
01-25-2006, 08:19 PM
Thats not good, you defiantley need the 27781 mod.

Heres the info i've been working from,

http://www.westernplows.com/pdf/22373.05_070105.pdf

Page 5 shows what parts make up what kits for what truck, pages 16 and 18 are the ones with the harness' that you have and that you need to get to, Tke a look and then let me know what you think.

Antnee77
01-25-2006, 09:25 PM
I'm trying to get the 27781 module now, but this whole schematics is confusing me. It seems that there are different headlight wiring setups in the 26351 and the 26361. Then, I get a different idea from how the headlight setup is acting now. Maybe this harness will actually be fine with the right module? I guess we won't know until I get one and connect it.

Crash935
01-28-2006, 03:12 PM
How are you coming with the new iso mod, any luck yet?

Antnee77
01-29-2006, 07:55 PM
Hey,
I haven't gotten around to it yet, but I have my friend on the lookout if he has one come into his shop. I will most likely go to my dealer and pick one up a day this week. I appreciate your help and your consistent interest in my problem, Crash. I'll definitely let you know when I pick this thing up and we'll see how it works. Thanks again!

Antnee77
01-31-2006, 02:54 PM
Well I traded in the extra set of Dodge push plates I had for the correct isolation module and headlight harnesses. All should be well when I pick them up tomorrow. Thanks again Crash for your help, I really appreciate it!

Crash935
01-31-2006, 07:04 PM
Good deal, you know where i am if you have problems (lets hope not)

Antnee77
02-05-2006, 11:07 AM
Thanks again Crash! :salute:

Crash935
02-05-2006, 12:57 PM
Take it everything is in and working well now?

Antnee77
02-06-2006, 07:34 PM
Oh yeah, I connected everything, cleaned up the wiring under the hood, and all is well here. Everything works as it should. Thanks again, Crash! :waving: