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Old 05-07-2022, 08:27 PM   #1
Mini-Skoolie
 
Join Date: May 2022
Location: Williamsburg
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Year: 2007
Coachwork: Thomas FS-65
Chassis: Freightliner
Engine: Mercedes MB900, Allison 2000
Rated Cap: 65
Thomas Wiring - Any Help Would Be Much Appreciated

Hi Everybody!

I fell into the old removing the back door now my bus won't start trap. I should have definitely visited this page first because I think I've messed up. It seems that everyone on Youtube and these posts have great advice, but nothing I found is applicable to Sandy (my skoolie). Any help on bypassing the interlock system would be much appreciated. Thank you in advance.

The first picture is a 2007 Thomas Freightliner FS65 fuse box label.

2. The outside electrical panel located outside the driver's side window.

3. The inside look to pic #2's electrical box.

4. The passenger side fuse box

5. This is the fuse that says interlock system which I think is my target.

6. These are the wires from the emergency door that I poorly prepared to be grounded. I also took out the hatch and window wires from the system all together. Unsure if this is a bad thing.

7. These are the wires that come from the key ignition.

8. This is a close up of the emergency door wires by the fuse box.

PS. Sorry some posted upside down... I'm still getting the hang of this site.
Attached Thumbnails
Skematics.jpg   Outside Electrical Box.jpg   Inside Wiring Main.jpg   Passanger Fuse Box.jpg   20 Amber Fuse #21 For Ignition Interlock.jpg  

Emergency Door Wiring Now Able Grounded.jpg   Skoolie Ignition Wires.jpg   Ignition Wiring From Inside.jpg  

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Old 05-07-2022, 08:37 PM   #2
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Was there a switch at the back door?

Did you remove it?

You need to determine if that wire needs to see ground or be open in order for the computer to think the door is closed.

Did you cut any wires?
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Old 05-07-2022, 08:46 PM   #3
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The wires from the back door are shown in picture number six. I cut a lot of wires but have them all. I also put grounding ends on the three that I thought mattered (connected directly to the back door). Unsure as to which ones I need to ground.
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Old 05-07-2022, 08:52 PM   #4
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Quote:
Originally Posted by Murphy's Law View Post
The wires from the back door are shown in picture number six. I cut a lot of wires but have them all. I also put grounding ends on the three that I thought mattered (connected directly to the back door). Unsure as to which ones I need to ground.
Cutting no bueno!

Try re_installing that circuit.
Can you match up the colors of the cut wire then one by one ground the others to see if it will start?

If that don’t work then I would call a Thomas bus dealer and ask them for the wiring diagram for the rear door interlock circuit.

Most Thomas dealers are real good in providing this info.
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Old 05-07-2022, 08:54 PM   #5
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Additional Photos

These are some photos throughout the process. The first one isn't great, but the next is a clear picture from the interlock system. The problem is I traced all these wires back to essentially three wires (pic #6 from OG post), stripping everything in between. The next one is from a youtube video that had a similar bus. This sort of explained the grounding non grounding solution, but I think I'm past that point. I'd like to try and solve this towards the front of the bus if possible. The last two are pictures of the bus before I removed a majority of the wiring.
Attached Thumbnails
20220429_173430.jpg   20220425_134626.jpg   20220506_101714.jpg   20220425_134633.jpg   20220502_131249.jpg  

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Old 05-07-2022, 08:59 PM   #6
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The search button can be very friendly….

I found this thread -> how to remove the Thomas Vandalock ignition interlock

https://www.skoolie.net/forums/f10/h...ock-10956.html
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Old 05-07-2022, 09:01 PM   #7
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Thank you for your help, but I've read that post too many times to count. None of the responses are applicable to my bus. I've tried to learn from their stories and match their parts with mine, but have come up short. Again, thank you for your responses.
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Old 05-07-2022, 09:48 PM   #8
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Wiring Diagram

http://s3.amazonaws.com/production-s...l_drawings.pdf
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Old 05-07-2022, 10:20 PM   #9
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Thomas Wiring - Any Help Would Be Much Appreciated

In the thread referenced by ewo 1, post #62 is your answer. Somewhere you have an interlock relay. I remember reading that there is a board hidden in the FS65 dash. Maybe someone with that model can help us out here.

[emoji3522]Dave
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Old 05-07-2022, 10:30 PM   #10
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Thomas Wiring - Any Help Would Be Much Appreciated

I have different Thomas model but mine is labeled “starter door interlock relay”. Click image for larger version

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Old 05-08-2022, 08:02 PM   #11
Mini-Skoolie
 
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Thanks Dave, you're the dude. I'll try and find it tomorrow with that method. I saw it but couldn't determine the exact fuse to link it to. His looks like a full-on switch, not a fuse. My bus says starter interlock on Board One LED #21 (from the first picture).
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Old 05-08-2022, 08:43 PM   #12
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Quote:
Originally Posted by Murphy's Law View Post
These are some photos throughout the process. The first one isn't great, but the next is a clear picture from the interlock system. The problem is I traced all these wires back to essentially three wires (pic #6 from OG post), stripping everything in between. The next one is from a youtube video that had a similar bus. This sort of explained the grounding non grounding solution, but I think I'm past that point. I'd like to try and solve this towards the front of the bus if possible. The last two are pictures of the bus before I removed a majority of the wiring.
My 98 Thomas has the cut-off switch on the back door in the form of a simple gate latch with a wire that rubs along the side of it. With the latch in the unlocked position, the engine will start. With the latch in the locked position, the bus will not start. A friend of mine was looking at it and said all I would need to do is open the box the latch runs out of, remove the two wires attached to the latch that completes the circuit when it's open and twist them together. Then wrap them with electrical tape and push them out of the way. This fools the bus in to thinking the latch is open and I can still use the latch as a door lock without having to worry about the bus not starting.

This might be a simple method you could use?

I'm leaving the interior of my bus intact and I kind of like that added bit of anti-theft security so I'm leaving it active.
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Old 05-08-2022, 10:39 PM   #13
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Quote:
Originally Posted by Murphy's Law View Post
Thanks Dave, you're the dude. I'll try and find it tomorrow with that method. I saw it but couldn't determine the exact fuse to link it to. His looks like a full-on switch, not a fuse. My bus says starter interlock on Board One LED #21 (from the first picture).

Yeah. You have got to find the right relay. His(post 62) is not a switch or a fuse. He pulled the relay and jumped it

https://youtu.be/aV-uAdftl7o

Good luck!
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Old 08-16-2023, 07:39 PM   #14
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Same issue

Hey murphyslawI have the same bus, and the EXACT same problem… all my attempts have just so far led me to failure, and I think I’ve narrowed down the answer to the circuit being somewhere in the passenger side circuitry? Did you ever end up solving the issue? If so.. that would be a MASSIVE help to me. Thanks for any insight
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