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Old 10-11-2015, 02:49 PM   #15
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No. This was happening before I replaced the batteries. We had some instances unrelated where we had low battery lights when plugged into shore power but just put it off on replacing.

I changed the batteries thinking that might be the cause.
My thoughts exactly on the chassis battery powering that.. All is working fine with the new batteries as it was but its still blowing the two fuses as before so that wasn't the source.
Aleckimball.
As demnis 45 said the "Allison shifter"... as well as the "Allison VIM", (vehicle interface module) and the "Allison TCM", (transmission control module), and the ECM (engine control module). are All powered by the chassis battery ..(NOT the house batteries).
IMO that is why replacing the house batteries did nothing to correct your problem.

That said, me thinks you initially had, (and still have), a "chassis" battery problem... (NOT a "house" battery problem).

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Old 10-11-2015, 02:57 PM   #16
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I'm wondering if you have a short in a wire someplace. If you can get to it. Check to see if the wires are getting hot after you shift. If so it would indicate a possible short.


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Old 10-12-2015, 08:17 AM   #17
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Great advice. Thanks all.. I'm gonna go ahead and replace the chassis batteries to rule that out. There is no obvious wire issue but that will be the next step.

One question... Is there a certain type of battery for the chassis? I really don't want to go to camping world and pay their crazy markup. Any advice appreciated.
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Old 10-12-2015, 01:18 PM   #18
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Originally Posted by Aleckimball View Post
Great advice. Thanks all.. I'm gonna go ahead and replace the chassis batteries to rule that out. There is no obvious wire issue but that will be the next step.



One question... Is there a certain type of battery for the chassis? I really don't want to go to camping world and pay their crazy markup. Any advice appreciated.

If the coach starts and idles fine, there is nothing wrong with the batteries. However if you still wish to replace them, there should be a tag on them saying what size they are. They will be a Commercial Battery meaning for trucks etc. and you can go to an Auto Parts store or the like to battery distributor.
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Old 10-12-2015, 01:45 PM   #19
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I believe the j1939 is where a mechanic would plug in his laptop for diagnostics. The diesel equivalent of OBD2.
Also, a loose ground wire will not blow a fuse. The suggestion to check the wires on the transmission sounds like a good place to start.
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Old 10-12-2015, 03:43 PM   #20
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If the coach starts and idles fine, there is nothing wrong with the batteries. However if you still wish to replace them, there should be a tag on them saying what size they are. They will be a Commercial Battery meaning for trucks etc. and you can go to an Auto Parts store or the like to battery distributor.
I would agree with you. Here's a thought. On some coaches, the Allison control module is fed by small wires connected to the chassis battery cables at the battery posts. The coach starts and idles fine, indicating the main cables are connecting fine to the battery posts. But, if those small transmission wire connections do exist, maybe they are corroded and need to be cleaned.

??

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Old 10-12-2015, 06:08 PM   #21
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I would agree with you. Here's a thought. On some coaches, the Allison control module is fed by small wires connected to the chassis battery cables at the battery posts. The coach starts and idles fine, indicating the main cables are connecting fine to the battery posts. But, if those small transmission wire connections do exist, maybe they are corroded and need to be cleaned.



??



Jim

Good point Jim, it is definitely not a battery problem
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Old 10-12-2015, 06:21 PM   #22
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Do you have a toad and connection between the toad and RV? Try it with the toad unplugged to eliminate the possibility of a short in the umbilical cable. Since it only happens when you shift into reverse, it sounds like perhaps the back up lights, rear view camera, or something else that is triggered by the reverse position is shorting out and blowing the fuse.

Weak batteries are not the issue and I wouldn't hold out any hope that changing batteries will correct it. You might start by pulling the fuse that protects the back up lights and camera. Also, if you have 'docking' lights that come on when in reverse, they should also be checked and pull the fuse to them.
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Old 10-13-2015, 08:09 PM   #23
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It is happening when shifting into drive. I haven't tried shifting into reverse yet. I am blowing the two 10 amp electronic transmission shift fuses. Just to clarify.
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Old 10-14-2015, 08:34 AM   #24
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We have been sitting here in our current spot (Santa Rosa Beach, FL)for 6 weeks and packed up yesterday to move. When I started the rig up and went to shift from NN to D (arens electronic shifter with Allison trans) the display went dead. Figured out I blew the two 10amp fuses for the shifter. Replaced them and tried again. Same thing.
Any ideas would be greatly appreciated!
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It is happening when shifting into drive. I haven't tried shifting into reverse yet. I am blowing the two 10 amp electronic transmission shift fuses. Just to clarify.
Aleckimball
There are 6 relays and 1, (or 2 fuses), in the Allison VIM (vehical interface module) which control the shifting operation:
https://www.google.com/url?sa=i&rct=...44916943843580

I had a similar "no shift out of neutral" problem with my Allison M3060 transmission shifter on 2 different occasions, (however in my case it did NOT "blow a fuse").

The first time the cause was a corroded/bad wire from the chassis battery to the Allison VIM (vehical interface module), which had to be replaced.

The 2nd time, (years later), the problem was caused by ONE bad relay in the VIM.

Good luck locating and fixing your shift problem...
(please post what you find).

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Old 10-14-2015, 10:49 AM   #25
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Great. I will check this ... But can you tell me where I would find the Allison VIM? I had read about similar wires running from the battery but I wasn't sure where to look... Really appreciate the help. My first motor home so I am still learning
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Old 10-14-2015, 11:56 AM   #26
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Also...this might be a stupid question.. How do you know if a relay is bad? Fuses are easy but is there an obvious way to know when a relay goes bad?
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Old 10-14-2015, 02:32 PM   #27
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Also...this might be a stupid question.. How do you know if a relay is bad? Fuses are easy but is there an obvious way to know when a relay goes bad?
Those relays can be pulled and bench tested:
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Old 10-14-2015, 02:45 PM   #28
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Great. I will check this ... But can you tell me where I would find the Allison VIM? I had read about similar wires running from the battery but I wasn't sure where to look... Really appreciate the help. My first motor home so I am still learning
Aleckimball
My VIM happens to be inside my coach up under the center of the dash on the front firewall.
However I am told they can be located most anywhere.
(In a friend's CountryCoach the VIM is behind the paneling in a bedroom closet... and I have seen them in the engine compartment...as well as below the windshield behind an outside hinged access door).
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