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Old 12-23-2020, 08:18 AM   #21
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Sorry these are the photos in case itís had to see the ones in the links above

Thanks again so much guys!
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Old 12-23-2020, 03:13 PM   #22
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Join Date: Oct 2005
Location: Clearlake, Northern California
Posts: 2,404
Year: 1992
Coachwork: Blue Bird
Chassis: TC-2000 Frt Eng, Tranny:MT643
Engine: 5,9 Cummins
Rated Cap: 84
Let's see....
1999 Blue Bird forward control with Cummins 5.9 ISB, bought at auction in Pennsylvania for $975 in 2015.



If I understand you right, the engine will not start, and you suspect the Broken Mysterious Gadget is keeping it from starting.

ISB means electronic engine. So, we need someone who knows the electronics, in order to delete the Gadget -- on the theory that a vital circuit was routed thru the Gadget.
Or an installation manual for the Gadget -- manual No. 817401001.
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Millicent The Bus - roof raised two feet, toy-hauler tailgate.
https://www.skoolie.net/forums/f11/th...gate-1564.html
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Old 12-23-2020, 09:09 PM   #23
Skoolie
 
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Join Date: Dec 2013
Location: SoCal
Posts: 242
Year: 1989
Coachwork: Crown Coach
Chassis: 40ft 3-axle 10spd O/D, Factory A/C
Engine: 300hp Cummins 855
Rated Cap: 91
As above it appears that something critical to engine start and probably running operation is being routed through the widget. Once that DB15 (that's what it's called by the way) plug is unplugged from the widget you have effectively removed the widget from the vehicle. That would be your permanent fix, except for the fact that the engine computer is requiring a path through the widget to be intact for it to function. What you'll need to do is find someone familiar enough with the engine computer and it's wiring so as to place jumpers around the widget and restore the ORIGINAL wiring BEFORE this thing was installed as an aftermarket modification.

If you can find an actual manual for the widget where it shows how to install, and what wires to modify to insert the thing, you should be able to undo and restore the original wiring before the widget was inserted. This would be the best hope.

Remember this widget is not a stock factory item but installed later where they had to make changes in the original wiring to insert this thing in the circuits. Not impossible to remove and undo it, but it does require someone familiar with the engine, it's computers, and it's accessory sensors and such in order to CLEANLY remove this widget without leaving any further nasty problems if they do it wrong......be afraid, be very afraid, of that scenario.

They may remove it but leave you other problems. Good luck and find the best qualified to do this job, it's worth whatever it costs to get it right. And verify all systems work properly afterwords, Like Tach, Speedo, fuel gauges, Engine operates OK, etc. I see indications that this thing was reading all kinds of sensors probably used by other systems. They must be restored. It's only necessary to remove it electrically, not physically, from the bus. So you can leave it in place if you wanted to, as a decoration I guess, but the wires must be restored to the stock configuration.
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Old 12-24-2020, 05:31 AM   #24
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Join Date: Sep 2015
Posts: 3,823
Year: 2002
Coachwork: Thomas Built Bus
Chassis: Freightliner FS65
Engine: Caterpillar 3126E Diesel
Rated Cap: 71 Passenger- 30,000 lbs.
it is indeed a DB15 connector. Replace both the socket in the device and the end of the cable with new DB15 components. This will get it all back to "normal". From there, you can determine how best to eliminate it.
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