Community Forums

gemini5362 · 09-13-2014, 06:19 AM

I probably would not concentrate on engine issues and I would not worry about a parking awl in the transmission. Allison controls the transmission electronically and the lights in the panel should come on no matter what. As one other poster mentioned your unit has air parking brakes. I would concentrate on the advice mentioned concerning power to the panel such as bad grounds. If the Neutral lockout relay does what I think it does then it is going to stop the starter from turning over when you are not in park. It is not going to have any control over the power getting to the panel. If you have a chassis wiring diagram or can call Newmar and call one. I do not know what chassis Newmar uses although for some reason I want to think they make their own. If it is not a Newmar chassis for instance if it is a Freightliner call their tech support and find out where to look for the circuitry that powers the Allison.

IF you decide you have to have it towed to a repair shop. First I would have a mobile mechanic out there to fix it if possible. Second before towing your vehicle make sure the tow company knows how to do that. Pulling the axles Using the proper equipment on the front if it has independent front suspension etc.

TeJay · 09-13-2014, 07:32 AM

I did not realize that it was a DP with air brakes. So there is no parking pawl as such. Hey what can I say. I don't have much of a background with diesel chassis.

TeJay

Seabird1926 · 09-13-2014, 05:57 PM

Quote:

Originally Posted by TeJay

seabird,
You said that you suspected that you needed to get the transmission into park or neutral. Is there a reason why you can't get it into one of those gears??? Why did you make that statement??? So if you can't get the gear selector into park or neutral it's because the weight of the vehicle on a slope is keeping the parking pawl locked so you can't easily move it. It will move but it will take some effort.

Let us know what your response is to that question before trying others things. No vehicle will start if it's not in park or neutral.

TeJay

There are pushbuttons for forward, neutral, reverse and mode. With the switch on there is no LED on the screen and no response to the pushbuttons. The batteries are new and charged, the other gages are alive. The relays on the ecu board tested good as did the two 10 amp fuses. Are you saying I will have to tow the MH to a level spot in order for the transmission to work?

HHIDan · 09-13-2014, 06:45 PM

Get a large truck mechanic under the coach. Within about 5 minutes he will have found a loose connection near starter. On my coach all my ignition power dropped to 3.3 volts, no lights in the dash or on my shifter. If you have an engine kill switch at the engine, measure your voltages on each side of the switch then turn the switch off and measure again, if the voltage goes to 12 volts on one side of the switch the problem is to the other side and I am betting it's towards engine.

dennis45 · 09-14-2014, 10:33 PM

Quote:

Originally Posted by HHIDan

Get a large truck mechanic under the coach. Within about 5 minutes he will have found a loose connection near starter. On my coach all my ignition power dropped to 3.3 volts, no lights in the dash or on my shifter. If you have an engine kill switch at the engine, measure your voltages on each side of the switch then turn the switch off and measure again, if the voltage goes to 12 volts on one side of the switch the problem is to the other side and I am betting it's towards engine.

I agree with your diagnosis but not sure why the mechanic has to be large. A little truck mechanic might be able to reach the hard to get at spots. LOL.. The Devil made me say it....

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gemini5362 · 09-15-2014, 09:19 AM

Seabird

I think you are getting good advice but maybe some of them are misreading your post. I understand you to say you have all your gauges working everything has power except the Allison control panel. When you turn your key on there are no lights on the Allison. That is very specific information. There is probably no power going to the Allison control panel. I do not know where the power feeds into that at. I advised earlier to find out what type of chassis you have and call the chassis manufacturer and ask them where the power is for that. The other thing you need to do is check for the ground wire going to that panel and make sure it is ground. I am sure you are going to find that you either have a bad ground, blown fuse to the Allison control panel, or a bad connection where the power goes to the control panel somewhere between it and the battery that feeds it. In my opinion until you fix the above you are wasting your time looking at anything else.

You know you have power to your dash, You know the batteries are up since you have power. The engine is not going to turn over unless the control panel tells it that the transmission is in neutral. That is not going to happen until you get power to that panel. Fix the power to the panel first then see what happens.