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Old 11-02-2023, 12:25 PM   #1
Join Date: Apr 2010
Posts: 16
Year: 1989
Coachwork: Bluebird
Chassis: TC2000
Engine: 5.9
Rated Cap: 45
1991 TC2000 Air Brake/Start issue

Hi Everyone,
1991 TC2000 5.9 Cummins,
Its been sitting for a few months in Utah, put a new battery in, now the Air brake buzzer will not sound, no engine warnings, and it will not start, but turns over strong.

Somehow, the buzzer has something to do with starting the engine.

Where is the buzzer, and where is the air brake low pressure warning switch?

Then I need to determine how this affects the engine running?

Last year, the buzzer was intermittent, a few cycles of the ignition switch, the buzzer worked , and it started and ran fine.

Any help apprciated. I am a long time aviation mechanic and electrical tech..

Apacheglen is offline   Reply With Quote
Old 11-02-2023, 02:13 PM   #2
Bus Nut
Join Date: Oct 2018
Location: Central Alabama
Posts: 559
Year: 1998
Coachwork: Blue Bird
Chassis: TC/2000
Engine: 5.9 Cummins 12-valve
Rated Cap: 1
I have a '92 and '98 with the 12valve 5.9 and if it is cranking and not starting then I have a fuel supply issue. I would loosen an injector line to check for fuel. The 92 has a buzzer under the arm rest, left of the driver. The switch is between the compressor and the engine block.
BamaBus is offline   Reply With Quote
Old 11-02-2023, 11:57 PM   #3
Bus Crazy
Join Date: May 2018
Location: topeka kansas
Posts: 1,798
Year: 1954
Coachwork: wayne
Chassis: old f500- new 2005 f-450
Engine: cummins 12 valve
Rated Cap: 20? five rows of 4?
1994 tc2000

Uh, mine beeps with low air pressure. My buzzer noise is linked to the rear door. My bus was never a school bus, I believe was used like a parking lot shuttle bus, us government purchase in Houston as far as I can tell. Painted Air Force blue.

Any ways, the only time I have a no crank issue, low battery voltage, and the shifter NOT in neutral.

What about the fuel shut off solenoid, weak, sticky, or flat out busted?

magnakansas is offline   Reply With Quote
Old 11-03-2023, 10:05 AM   #4
Bus Geek
Join Date: May 2014
Location: West Ohio
Posts: 3,778
Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
What you're likely seeing is an ignition switch or solenoid issue.

The buzzer is a symptom of it, not a cause. No need to find the buzzer or switch. The engine shut off solenoid, dash gauges/lights, and that air buzzer is likely fed power from the same source. None of them working shows that power isn't getting where it's supposed to be.

Might be related, might not be, but since you recently replaced the battery, I'd inspect that it was done correctly and you didn't miss a wire, or install a wire wrong. Following that, trace wires to see where you have and don't have power.
My build: The Silver Bullet
Booyah45828 is offline   Reply With Quote
Old 11-10-2023, 05:21 PM   #5
Join Date: Oct 2020
Location: Wasilla Alaska
Posts: 52
Year: 1991
Coachwork: Blue Bird
Chassis: TC2000
Engine: Mechanical 5.9
Rated Cap: 35 Feet
I also have a 1991 TC2000 with the 5.9. My bus did not come with a fuel solenoid but instead has a manual lever to turn on and off the fuel. If the engine spins and is above about 30 degrees F it starts. The 5.9 has no grid heater in the 1991 TC2000 so there is nothing electrical to prevent a start.

If the gauges and buzzers don't come on then it is the key switch or one of the wires to or from it.
mhaisten is offline   Reply With Quote

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