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Old 10-15-2012, 10:42 AM   #1
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J1939 or J1708 data port location

I would like to know the location of the J1939 or J1708 data port for a 2001 national marlin 39ft. with 300hp isb cummins engine with 6 speed allison trans on spartan chassis. I looked under dash, but can not find it.
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Old 10-15-2012, 05:15 PM   #2
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I have found it. It is a J1939 connection. It is on passenger side at rear beside transmission. It is fastened on outside of frame. Also I noticed my idle was high all the time. Inside a panel held on by screws, beside the driver is a toggle switch that is spring loaded. It can be jogged to change idle up or down in small increments. It can be changed from 700 to 875 rpmI think I will move it to out side of panel so I can adjust when ever I wish.
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Old 10-15-2012, 09:25 PM   #3
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I used to have an 01 Marlin and found it behind the dash. I seem to recall it was in the bundle above the steering column.
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Old 10-17-2012, 05:48 PM   #4
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Yes Ken I found it above the steering wheel inside dash. The only problem is its not accessable. I pulled on the wires but they are to short. Its burried deep can hardly get my hand in there. I have to drill a 3" hole into steel plate that the steering wheel is anchored to. I am a tool and die maker so that will not be a problem. I guess they do not want you to touch it. The alternative to getting at it is to take the dash apart and that is worse.
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Old 10-17-2012, 08:27 PM   #5
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I don't recall if it was taped or Zip-tied in the bundle of wires. The wires should be long enough to extend the 1939away from the steering support. I pulled the dash face back so I could get to it from above. A few screws and Velcro accross the top and I believe 4 screws from below - one on each side and one on each side of the steering column. I used the connection for VMSPC connected to a laptop.
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