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Old 06-15-2020, 12:57 AM   #1
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Allison transmission wire harness

So talked to a couple different Allison technicians and figured out my transmission is throwing a diagnostic code 4412 and 2212 , I think. Too exhausted to remember at the moment. But basically there’s a bad wire and the throttle sensor. Stan, from Valley Power Systems in Irwindale, ca (thank you Stan!) suggested I test all the wires in the harnesses going into the transmission. I found a harness on the side that has a short little black wire coming out of the harness but is not connected to a wire going into the bundle. I don’t know anything about electrical but doesn’t that have to be connected to a wire? It can’t just be connected to nothing right? Doesn’t that make it an open circuit? How do I fix that? How do I test continuity in a harness without having to follow it to the Other end of the Harness? Is that even possible? I’d really appreciate anyone’s help and thoughts on this. We got our first $60 ticket this morning because we chose to break down in city that Doesn’t allow Rv except only has resident required Rv passes. God bless
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Old 06-16-2020, 04:45 PM   #2
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To check "continuity" you need an ohm meter (has it's own power supply - a battery) and you need to "ohm" it out end to end. Another way is to use a test light that senses voltage or ground depending on how you wire it, but you must know what to expect on each wire, a + or -. Having a wire hanging out that is not connected is not unusual. Is it stripped back exposing the wire or just cut off on the end?
Do you know the model of Allison you have? You can crawl under the coach and there is a plate on the side of the tranny.
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Old 06-18-2020, 03:33 PM   #3
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No the wire isn’t showing, I found out like you said that they didn’t always use all wires coming out of a harness. Which in my opinion is dumber that a box of rocks! It’s too dang short to actually be of use in case one of the other wires went. Only purpose is to confuse the garage mechanic and inflate cost if you ask me. Anyhow, I have a MD 3060 with a push button keypad. Can you please explain further what it means to “ohm it out”? I’ve heard that several times and watched too many YouTube videos and it’s too big a job to completely yank out the whole thing, especially on the side of the road. I’m pretty good with mechanics but it’s my first diesel and this thing is exhausting me . So if you could explain it like I were an idiot I would truly appreciate it. Thanks
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Old 06-18-2020, 04:09 PM   #4
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Valley Power can be a good vendor. I have used them in Sacramento.

Perhaps they can provide or suggest a mobile service to get your rig moving to a repair shop?

Or, use your roadside assistance plan to get towed or repaired.

Note : Some wire harness setups can be used in several models of rigs. So the extra wires can be a normal byproduct of using standard wiring harness to save production cost if your rig does not need those wires.

Testing to see if the wire has continuity (an unbroken path) between two attachment points is done with a multimeter set to the Ohms function. One lead on the meter to each end of the wire.

(Using a cheater wire to one lead is common for runs longer than your meter leads.)

The meter then shows whether the wire path is complete or broken. A perfect run is shown as 0.00 ohms on my meter.

I suspect the loose wire does not need to be attached unless you see that it is damaged or a dangling wire close by.
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Old 06-18-2020, 05:31 PM   #5
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You could try to reboot the transmission memory by shutting off the chassis battery for a couple of minutes or disconnecting the negative side of the battery.
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Old 06-23-2020, 04:07 PM   #6
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Just a quick thought.....On my older HD4060 Allison, there was a bulletin regarding removing a ground wire from the harness to the ECU. There had been some issues with having a dedicated ground wire to the ECO and went so far as to isolate the ECU from the chassis itself. it's been a few years but my trouble shooting is documented here in this section of this forum.
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