Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×


Reply
 
Thread Tools Display Modes
 
Old 10-19-2023, 07:33 PM   #1
New Member
 
Join Date: Oct 2023
Posts: 6
Thomas C2 multiplex brake controller

Hello all. I have been unable to find any information that will guide me through setting up a brake controller on my C2.

I have a 2012 Thomas C2 with hydraulic brakes. So far none of my local dealers know how to setup the trailer wiring in the multiplex system. I want to town a double axle BigTex car hauler and my Jeep.

Etrailer and Fleet Pride said they had nothing that would work for me.

If anyone can guide me I would greatly appreciate it. If I can’t figure this out I will have to go another route and get another skoolie I suppose.

Thanks in advance.


2012 Thomas C2 Freightliner
Cummins

Vermonster is offline   Reply With Quote
Old 10-19-2023, 08:21 PM   #2
Bus Crazy
 
s2mikon's Avatar
 
Join Date: Nov 2014
Location: NM USA KD6WJG
Posts: 1,335
Year: 1991
Coachwork: Bluebird
Chassis: All American RE 40 FEET
Engine: Cummins 8.3
I can't see why this won't work. https://www.etrailer.com/Trailer-Bra...sha/90885.html
__________________
Why can't I get Ivermectin for my horses?
s2mikon is offline   Reply With Quote
Old 10-19-2023, 09:54 PM   #3
New Member
 
Join Date: Oct 2023
Posts: 6
I was told nothing would work with the multiplex. I spoke with two different people at Etrailer.
Vermonster is offline   Reply With Quote
Old 10-20-2023, 01:45 AM   #4
Bus Crazy
 
ewo1's Avatar
 
Join Date: May 2015
Location: Central Tx.
Posts: 2,035
Year: 1999
Chassis: Amtran / International
Engine: DT466E HT 250HP - Md3060
Not sure if this would work for you but the manufacturer states "Compatible with tow vehicles that have multiplex wiring systems".

Not sure if this means your bus is the tow vehicle?


TEKONSHA 902502 PRODIGY® RF PROPORTIONAL TRAILER BRAKE CONTROLLER 1-3 AXLES)

https://www.hannarv.com/P/24432/Teko...RFBrakeControl
ewo1 is offline   Reply With Quote
Old 10-20-2023, 05:59 AM   #5
New Member
 
Join Date: Oct 2023
Posts: 6
Thank you for the reply.

This brake controller setup is for a vehicle that already has the wiring installed. I have a multiplex system that has no brake wiring. I need to tie into the wiring system and run all the wires to the rear of the bus.
I might be able to find the wiring schematics somewhere, but I was told that even if I tie into the bus wiring directly, the multiplex computer may sense a different level of resistance and shutdown. The only tech that has been willing to help me just stated that he doesn’t know if it will shutdown or not.
I don’t want to fry my wiring or, of course, have the possibility of losing my brakes while towing. Maybe someone with multiplex experience can advice if this will happen and/or how to prevent it.
Vermonster is offline   Reply With Quote
Old 10-20-2023, 11:53 AM   #6
Bus Crazy
 
ewo1's Avatar
 
Join Date: May 2015
Location: Central Tx.
Posts: 2,035
Year: 1999
Chassis: Amtran / International
Engine: DT466E HT 250HP - Md3060
Quote:
Originally Posted by Vermonster View Post
Thank you for the reply.

This brake controller setup is for a vehicle that already has the wiring installed. I have a multiplex system that has no brake wiring. I need to tie into the wiring system and run all the wires to the rear of the bus.
I might be able to find the wiring schematics somewhere, but I was told that even if I tie into the bus wiring directly, the multiplex computer may sense a different level of resistance and shutdown. The only tech that has been willing to help me just stated that he doesn’t know if it will shutdown or not.
I don’t want to fry my wiring or, of course, have the possibility of losing my brakes while towing. Maybe someone with multiplex experience can advice if this will happen and/or how to prevent it.
Yes, be cautios!

I would give them a call though and get more details on how the wiring works.

Another thing that I myself would look at, is your multiplex signals driving relays that sends control (+12v) voltages to the lights and if so, can you tap into the relay output contact themselves to get the control voltages for your brake controller setup or just installation of a 7 way plug instead?

In other words, not directly tapping into the mutiplex side of the signal, but into the relay output side itself.
I wonder if that would work?
ewo1 is offline   Reply With Quote
Old 10-20-2023, 12:32 PM   #7
Bus Crazy
 
ewo1's Avatar
 
Join Date: May 2015
Location: Central Tx.
Posts: 2,035
Year: 1999
Chassis: Amtran / International
Engine: DT466E HT 250HP - Md3060
Quote:
Originally Posted by Vermonster View Post
Hello all. I have been unable to find any information that will guide me through setting up a brake controller on my C2.

I have a 2012 Thomas C2 with hydraulic brakes.

.......

If anyone can guide me I would greatly appreciate it. If I can’t figure this out I will have to go another route and get another skoolie I suppose.

Thanks in advance.


2012 Thomas C2 Freightliner
Cummins
I just found this site that has numerous docs/ppt on the Thomas c2.
It has service manual info and quite a few circuit diagrams.

Maybe you can find some useful info there!

https://myersequip.com/resources/product-downloads/
ewo1 is offline   Reply With Quote
Old 10-20-2023, 01:04 PM   #8
Bus Crazy
 
s2mikon's Avatar
 
Join Date: Nov 2014
Location: NM USA KD6WJG
Posts: 1,335
Year: 1991
Coachwork: Bluebird
Chassis: All American RE 40 FEET
Engine: Cummins 8.3
You could install a second brake light switch and a second set of brake lamps and you would be fine. If you were able to convert your bus then you have the skills already. Most of these universal controllers use an inertia sensor to apply the trailer brakes proportional to your tow vehicle slowing down. The also light up the brake lights when applied. You could just go around your present system and be safe.
__________________
Why can't I get Ivermectin for my horses?
s2mikon is offline   Reply With Quote
Old 10-20-2023, 01:38 PM   #9
New Member
 
Join Date: Oct 2023
Posts: 6
Thank you both for the feedback.

I am a little over my head when it comes to in-depth schematic reading and this type of system. I have hooked up a brake controller or two before, and I had a proportional controller on my previous skoolie, but I am not confident about this.

I will get in there there and look at the relays themselves and see if it’s possible to tap into them. The tech mentioned a relay box or something in the driver side fender, I will see what that looks like.
Vermonster is offline   Reply With Quote
Old 10-20-2023, 01:55 PM   #10
New Member
 
Join Date: Oct 2023
Posts: 6
I think I might try this setup.

Vermonster is offline   Reply With Quote
Old 10-27-2023, 10:11 AM   #11
New Member
 
Join Date: Dec 2020
Posts: 1
I've researched this pretty extensively for my own C2, I just started on the trailer wiring. Without swapping the Chassis module for one that has trailer outputs, the best and most complete option seems to be a DirecLink J1939 Brake Controller. https://tusonrvbrakes.com/products/direclink-dl-100
RoosterSocks is offline   Reply With Quote
Old 11-04-2023, 03:27 PM   #12
Mini-Skoolie
 
Join Date: May 2018
Location: Tennessee
Posts: 58
Year: 2007
Coachwork: Thomas
Chassis: Thomas
Engine: Cummins 5.9
Rated Cap: 8 seats, 5 wheelchairs
Surge brakes

I think you've gotten some good information so far and can probably make electric brakes work but my first thought was maybe go to a trailer with hydraulic surge brakes. No worries at all about screwing up your multiplex wiring then.
1dmpo is offline   Reply With Quote
Old 11-04-2023, 05:10 PM   #13
Bus Geek
 
Jolly Roger bus 223's Avatar
 
Join Date: Sep 2017
Location: Swansboro,NC
Posts: 2,998
Year: 86
Coachwork: Thomas
Chassis: Ford B700
Engine: 8.2
Rated Cap: 60 bodies
i have trailers with juice brakes and electric brakes and i prefer the electric brakes because you can set there intensity.
gain/loss/sensitivity.
Jolly Roger bus 223 is online now   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 02:52 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.