Recent Posts

61

Technical Support / Re: Dimmer switch for PacBrake?

« Last post by Eric Maclean Co-Admin on September 21, 2026, 09:54:53 PM »

Brian
I can't see any reason why you can't use an old style foot dimmer switch in place of the rocker switch up on me console.
Just be aware that that switch controls the exhaust for pack brake through the engine ECM and transmission TCM.
the ECM commands the pack brakes solenoid operation using criteria to control down shifts and maintain an optimal RPM for exhaust breaking.
ECM also controls the RPM and road speed at which the pack break drops out to avoid stalling the engine it stops.


Eric

62

Technical Support / Re: 2001 Beaver Marquis. Transmission selector not working

« Last post by Eric Maclean Co-Admin on September 21, 2026, 04:50:32 PM »

The fuses are usually in in line fuse holders attached to the bundle of battery cables headed out the rear of the battery compartment.

Eric

63

Technical Support / Re: Dimmer switch for PacBrake?

« Last post by Brian Fahlgren on September 21, 2026, 02:13:02 PM »

That's a pretty good idea too. Thanks!

64

Technical Support / Re: Dimmer switch for PacBrake?

« Last post by David Ciotti on September 21, 2026, 01:21:31 PM »

I put a little runner bumper on my jake brake switch so i can easily find it without looking too hard.

65

Technical Support / Re: 2001 Beaver Marquis. Transmission selector not working

« Last post by Vernon Boen on September 21, 2026, 05:11:15 AM »

I have searched all over the battery bay for the fuses but I still haven't located them. Any suggestions where I might find them?

66

Technical Support / Re: 2001 Beaver Marquis. Transmission selector not working

« Last post by John Bagwell on September 21, 2026, 03:05:02 AM »

I had the same problem with my 2001 Monterey.   We figured the keypad was the issue.  I send it to Transmission Instruments, and they tested and rebuilt the unit, and it now works great.  It was tested and rebuilt for $348, and comes with a 2 year warranty.  I also send them the ECU unit so the could test it.   My keypad just lite up with the “mode light” on, engine would not start or turn over. 

67

General Discussion / Re: Profile

« Last post by Brian Fahlgren on September 21, 2026, 01:37:47 AM »

Thank you for the info and advice!!

Brian

68

Technical Support / Re: 2001 Beaver Marquis. Transmission selector not working

« Last post by Eric Maclean Co-Admin on September 21, 2026, 12:34:21 AM »

Vernon
In the coach assist library there is the Allison automatic troubleshooting manual which includes logic and wiring diagrams which can help you understand and diagnose your issues.

I know you probably already have but I'll suggest it anyway.
In the battery bay there should be two or three 10 amp ATO fuses ( the red ones ) one is for the engine ECM (engine control module) power the other is for the TCM ( transmission control module).
Its not uncommon to find the transmission control module fuse blown which will cause the transmission control module to not function and result in no readings on the shift pad.

Next there are fuses in the transmission relay box the black box with the screw on cover mounted in the electrical Bay one of those fuses may be blown as well.

Again the transmission troubleshooting manual will be of great assistance in any of this.

Hope this helps
Eric

69

General Discussion / Profile

« Last post by Steve Huber on September 20, 2026, 11:49:23 PM »

All (Especially New Forum Members),
Please enter your coach Model, Year, and Engine in the Signature block of your profile. It will then show up on all of your posts and will help other members in diagnosing your current issue, etc. in addition to saving you from supplying it each time you have a question.
To add the information;
   _Log in to the Forum
   -Select Profile from top ribbon
   -Select Modify Profile from left side of display
   -Select Forum Profile
   - Enter your Coach info in the Signature box
   -Select Change Profile at bottom of screen
Steve

70

Technical Support / Re: 2001 Beaver Marquis. Transmission selector not working

« Last post by Vernon Boen on September 20, 2026, 10:30:07 PM »

Thank you for the reply. I have already located this box and checked both fuses. They weren't blown but I changed them anyway with no luck.