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Old 08-13-2020, 11:03 AM   #1
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Two mysterious controls

Hello everyone,

New member here, but have been lurking for a while. Finally we purchased a GM cutaway Thomas Built short bus and found two controls that we have no ideas on what they are. Does anyone know what they are for? Thank you in advance and it's great to join the community!

robust1976
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Old 08-13-2020, 11:09 AM   #2
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ahhh

the mysterious high beam switch!

the cable is probably a throttle lock/ high idle.... gosh even maybe choke if its a 70;s
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Old 08-13-2020, 11:21 AM   #3
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ahhh

the mysterious high beam switch!

the cable is probably a throttle lock/ high idle.... gosh even maybe choke if its a 70;s
Thanks for the lead. It's a 2002 GM 3500, so it can't be choke, can it? I'll test out if the left foot switch is high beam switch or not. Assuming it is, it brought another question: why they want to do that? Isn't a conventional hand lever more convenient?
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Old 08-13-2020, 11:34 AM   #4
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hmm,2002,.... well it looks aftermarket so i assume the cable is with the door, or stopsign, something added to the shell. still maybe a high idle.

maybe the foot switch too. flashers?
back in the day, that was high beams.
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Old 08-13-2020, 11:35 AM   #5
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Old 08-13-2020, 11:36 AM   #6
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Does the bus have rear heat? If so it look similar to mine that has a coolant shutoff valve that the driver can operate to block heat to the rear system.
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Old 08-13-2020, 01:11 PM   #7
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That control on the right appears to go through the firewall. I'd be willing to bet if you look under the hood and find where it goes, it would be linked to the throttle somehow. I drove an old ford b6000 I think it was that had something similar, you would untwist it, pull it to where you wanted to hold the throttle, twist it, and it would hold it there. On that particular bus, the spring for the accelerator pedal was super strong, and you really needed that to not wear out your leg.

And my first guess for the button is high beam switch.

Good luck,
jim
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Old 08-13-2020, 01:45 PM   #8
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Does the bus have rear heat? If so it look similar to mine that has a coolant shutoff valve that the driver can operate to block heat to the rear system.
I don't know if it has rear heat or not, but thanks for the clue and I'll open the hood and follow the cable to find exact what that is.
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Old 08-13-2020, 01:47 PM   #9
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That control on the right appears to go through the firewall. I'd be willing to bet if you look under the hood and find where it goes, it would be linked to the throttle somehow. I drove an old ford b6000 I think it was that had something similar, you would untwist it, pull it to where you wanted to hold the throttle, twist it, and it would hold it there. On that particular bus, the spring for the accelerator pedal was super strong, and you really needed that to not wear out your leg.

And my first guess for the button is high beam switch.

Good luck,
jim
Thanks for the info. I'll find out and report back later.
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