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Old 08-27-2021, 10:08 AM   #1
Skoolie
 
Join Date: Jun 2015
Location: Toledo OH
Posts: 224
Year: 2006
Coachwork: Thomas
Chassis: MVP-EF
Engine: Cat C7 + Allison MD3060
For download - Thomas MVP-EF wiring diagram!

Hi all, I reached out to the Thomas dealer that originally sold my bus, and they were kind enough to contact Thomas directly and get a generic wiring diagram for my bus. They said there aren't specific schematics available, but this is still VERY helpful to me. My bus is an 06 with a Cat C7, but the schematic mentions the Cat 3126, so I imagine this will work for older buses as well. Note that this applies to the MVP-EF model, I don't think it will apply to the Saf-T-Liner or an MVP-ER (rear engine). The biggest way to tell the two bus models is the Saf-T-Liner usually has round headlights, but I don't know if that's true for all model years.


Link: https://www.skoolie.net/forums/attac...1&d=1630076887
Attached Files
File Type: pdf Thomas MVP-EF Wiring Diagram.pdf (479.6 KB, 10 views)

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Old 09-24-2021, 08:52 AM   #2
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Join Date: Sep 2019
Location: Melbourne, FL
Posts: 89
Year: 2003
Coachwork: Thomas
Chassis: Saf-T-Liner MVP EF
Engine: Cat C7
Rated Cap: 29 (Perimeter Seating)
Right on time

Thanks for sharing this schematic. I'm replacing my instrument cluster&%#k with a NOS unit (ebay) and came across a suspected speedo wiring discrepancy which this document confirms. Black wire 12 is routed through the 8-way connector on my bus, instead of the 6-way, meaning if I just plug in the dash harnesses at best things are broke.

I have not examined all the harnesses for compliance to the diagram, but the new cluster does conform.

This is hard work with the drivers seat in place.
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Old 09-24-2021, 09:55 AM   #3
Skoolie
 
Join Date: Jun 2015
Location: Toledo OH
Posts: 224
Year: 2006
Coachwork: Thomas
Chassis: MVP-EF
Engine: Cat C7 + Allison MD3060
Quote:
Originally Posted by stlthe View Post
Thanks for sharing this schematic. I'm replacing my instrument cluster&%#k with a NOS unit (ebay) and came across a suspected speedo wiring discrepancy which this document confirms. Black wire 12 is routed through the 8-way connector on my bus, instead of the 6-way, meaning if I just plug in the dash harnesses at best things are broke.

I have not examined all the harnesses for compliance to the diagram, but the new cluster does conform.

This is hard work with the drivers seat in place.
I'm jealous you found a new cluster, mine just went out and I'm hunting parts yards to find one that hopefully works.
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Old 09-24-2021, 11:02 AM   #4
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Join Date: Sep 2019
Location: Melbourne, FL
Posts: 89
Year: 2003
Coachwork: Thomas
Chassis: Saf-T-Liner MVP EF
Engine: Cat C7
Rated Cap: 29 (Perimeter Seating)
I must consider myself lucky, I even found an oem replacement for my broken air pressure gauge. Now if i can fix the leaks, source a doghouse and air ride seat along with some underbus storage i'll be in great shape.

I have the old style dash, and the price was right. https://www.ebay.com/itm/124604721105.

My original was functioning, but was falling apart when i got it. i kid you not i had to use zipties and plastic 6-pack can holders to keep things in place. A true eyesore. Now the cluster will be the focal point of the whole project

I have been using the bluefire app as a digital dash, for me it works well so far.

What HP is your C7? I have the 210hp, lots of hours but only 120k on the odometer.

thanks again for the schematics. I cant decide if i should change the cluster wiring to match the bus, or change the bus to match the diagram.

Evan
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Old 09-24-2021, 11:11 AM   #5
Skoolie
 
Join Date: Jun 2015
Location: Toledo OH
Posts: 224
Year: 2006
Coachwork: Thomas
Chassis: MVP-EF
Engine: Cat C7 + Allison MD3060
Quote:
Originally Posted by stlthe View Post
I must consider myself lucky, I even found an oem replacement for my broken air pressure gauge. Now if i can fix the leaks, source a doghouse and air ride seat along with some underbus storage i'll be in great shape.

I have the old style dash, and the price was right. https://www.ebay.com/itm/124604721105.

My original was functioning, but was falling apart when i got it. i kid you not i had to use zipties and plastic 6-pack can holders to keep things in place. A true eyesore. Now the cluster will be the focal point of the whole project

I have been using the bluefire app as a digital dash, for me it works well so far.

What HP is your C7? I have the 210hp, lots of hours but only 120k on the odometer.

thanks again for the schematics. I cant decide if i should change the cluster wiring to match the bus, or change the bus to match the diagram.

Evan
Oh wow that is an old dash, I've never seen that style. Good to know I'm not alone though, I see LOTS of folks complaining about International dashes but no so many with Thomas issues.


I think my C7 is the 230hp - whatever the max was in 2005. I forget my hours but when I averaged out the odometer miles per engine hour I ended up with about 20 mph, so not too bad.
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