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Old 08-17-2016, 08:03 PM   #1
New Member
Join Date: Aug 2016
Posts: 4
Wiring help!

Hi, I joined the forum earlier today, and I need help already. I have a 2003 Girardin 30 passenger school bus, and to be registerable, I removed the stop sign arm and the 8 way safety lights. Yes, I just cut the wires. Now when I turn the bus on, alarms go off, and the rear turn signals don't light.

Is there a place to get a wiring diagram, or does someone have a suggestion how to reconnect some of the wires to get back to operating?


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Old 02-23-2017, 08:25 PM   #2
Join Date: Feb 2017
Location: Northern Virginia
Posts: 54
Year: 2005
Coachwork: Thomas
Chassis: Frieghtliner
Engine: 300hp MBenz
Rated Cap: 71 person
I would contact the bus manufacturer and ask for schematics.
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Old 02-23-2017, 10:16 PM   #3
Join Date: Jul 2016
Location: Colorado
Posts: 49
Year: 1998
Coachwork: BlueBird
Chassis: TC2000FE
Engine: 5.9L Cummins ISB
Rated Cap: 71

I only know BB, but assume most wiring is similar.....

BB only uses HOT wires. The neutral (ground) is made with the body of the bus. Cap off all the open wires (so nothing is shorting to ground).
Usually the wiring is color coded and numbered. Check the wires you cut, find them in the wiring panel, and see what they go to...

You probably blew a fuse or the flasher in the turn signal circuit, or maybe the lights themselves. You may have cut one of the wires to an emergency door/window or stop arm sensor (making the bus think the door or window is open) sounding the alarm.

Follow the wires.......

My BB's have primitive diagrams on the inside of the panel door.
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Old 02-23-2017, 10:52 PM   #4
Bus Crazy
Join Date: Feb 2012
Location: Salt Lake City Utah
Posts: 1,605
Year: 2000
Chassis: Blue Bird
Engine: ISC 8.3
You could attach a piece of wire to a battery positive supply, fuse it at maybe 3 amps, and start touching cut wires until you at least figure out which wires go to the turn signals. The small-ish fuse will prevent anything catastrophic from happening if you should touch something wrong in the process.

I don't know whether that flasher module would have operated the red and amber lights only, or the turn signals also. Hopefully the former -- if so, you could turn the ignition key on, hit the turn signal, and probe with a test light or volt meter to find which wires come from the turn signal flasher part of the circuit.
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