Help needed 08 GMC 1500 mm2 wiring - Snow Plow Forum - Let's Talk Snow Discussion Forums

 
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post #1 of 7 Old 01-27-2019, 02:42 PM Thread Starter
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Help needed 08 GMC 1500 mm2 wiring

I have a 08 hmc 1500, just bought a nice condition 7'6" sd 3 plug setup and the 3 port isolation module and all wiring.

I have run all wiring, mounted the module, connected all wires, so on.

I have no power to the joystick, and my passenger side high beam headlight on the truck will not function.

I've put the keyed power wire in 4 different spots, all of which have power with key on. Checked all grounds, checked and rechecked tapped connections to running lights and turn signals, still nothing.

There is a black wire off one of the 2 relays in the harness, I had no idea where it went but assumed it needed ground, grounded to battery and still nothing.

Does anyone out there have any photos of their setup, I need to look at another one or have someone tell me what I am missing here. Going crazy. Thanks in advance.
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post #2 of 7 Old 01-27-2019, 02:57 PM
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Originally Posted by Damesrus View Post
I have a 08 hmc 1500, just bought a nice condition 7'6" sd 3 plug setup and the 3 port isolation module and all wiring.

I have run all wiring, mounted the module, connected all wires, so on.

I have no power to the joystick, and my passenger side high beam headlight on the truck will not function.

I've put the keyed power wire in 4 different spots, all of which have power with key on. Checked all grounds, checked and rechecked tapped connections to running lights and turn signals, still nothing.

There is a black wire off one of the 2 relays in the harness, I had no idea where it went but assumed it needed ground, grounded to battery and still nothing.

Does anyone out there have any photos of their setup, I need to look at another one or have someone tell me what I am missing here. Going crazy. Thanks in advance.
http://library.fisherplows.com/fishe....00_021516.pdf
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post #3 of 7 Old 01-27-2019, 02:59 PM
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post #4 of 7 Old 01-27-2019, 03:14 PM
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post #5 of 7 Old 01-27-2019, 03:19 PM
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What did the plow come off of? You know the plow has to be connected for anything to work, it completes a power and ground circuits. Do not just connect wires to ground if you do not no where they are supposed to go. Do you have ignition power to the module from they keyed source, and do you have power to the fuses?
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post #6 of 7 Old 02-01-2019, 02:43 PM Thread Starter
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Sorry I didnt reply to you guys and I appreciate the help, went through everything and the A port harness was bad, alot of trial and error to figure it out with a multi meter but got it going and plowing like crazy since.
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post #7 of 7 Old 02-01-2019, 03:12 PM
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Originally Posted by Damesrus View Post
Sorry I didnt reply to you guys and I appreciate the help, went through everything and the A port harness was bad, alot of trial and error to figure it out with a multi meter but got it going and plowing like crazy since.
Glad to hear that you are up and running.
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