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Old 12-13-2019, 01:18 PM   #1
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Join Date: Dec 2019
Location: Southern California
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Year: 2007
Coachwork: Thomas Built Bus
Engine: Cat7
Won't start, throws an OPEN code

Hey guys,

my bus won't start. I figured out a code it displayed was saying there is an open short(I think), and I don't really understand how to find the short. Any tips or previous experience with the problem would be greatly appreciated.
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Old 12-13-2019, 02:43 PM   #2
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Join Date: Jul 2019
Location: Johnson City TN
Posts: 401
Year: 2004
Coachwork: IC/AMTRANS RE
Engine: T444E 7.3 w/ MD3060
Rated Cap: 36000lbs / 78pass / 39'
Hi and welcome to the forum.
So is the bus cranking at all?
If it is cranking is there any smoke at all coming out of the exhaust when cranking?
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Old 12-13-2019, 08:26 PM   #3
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Year: 2007
Coachwork: Thomas Built Bus
Engine: Cat7
I think you mean turning over by cranking? No, not at all. There is some quick clicking when I turn the key, but then silence.
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Old 12-14-2019, 10:32 AM   #4
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Join Date: Jul 2019
Location: Johnson City TN
Posts: 401
Year: 2004
Coachwork: IC/AMTRANS RE
Engine: T444E 7.3 w/ MD3060
Rated Cap: 36000lbs / 78pass / 39'
Yeah cranking/turning over same thing.
Do you know how to jumper the starter directly?
There is a solenoid mounted directly to the starter, one terminal (the large one) has a thick wire that feeds it power straight from the batteries, then there is a small terminal that prob has several wires connected to it. Using a piece of wire or screw driver, short those 2 out and see if it cranks, it prob will, if the key is turned on before doing this you can start it up like this.
You prob have a open in the starter interlock from a roof hatch or E-door that either isn't closed all the way, broken/cut wire, or bad switch.

I went through this myself and wired up a push button start straight to the starter trigger (small terminal) so I can always bypass the interlock junk.
IF you need I can make a video real quick to show you how to do it if you have no clue what I'm talking about.
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If you would like to check out my website that has all sort of information especially for the T444E/7.3PSD engines check out www.PatrickTheSalvageGuy.com I've got helpful downloads and articles as well as a link to my YT for other how to videos mainly on the F series trucks.
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Old 12-14-2019, 02:16 PM   #5
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Engine: DT466
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Are the batteries fully charged? I would check that first. Low batteries will often just result in some clicking noises followed by silence.
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