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Old 04-24-2017, 08:25 PM   #21
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Back to your original question, mine is a '97 but would likely be similar.


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Old 04-24-2017, 09:16 PM   #22
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Thank you for pic. The #11 fuse is good on mine.

I have the Allison AT545 transmission could I get more info on the transmission pressure switch
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Old 04-27-2017, 04:49 PM   #23
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I'm not sure which one is the switch.

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Old 04-27-2017, 05:45 PM   #24
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A is the reverse switch, B is your electronic Transmission Modulator. it looks like an AT545 transmission.
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Old 04-27-2017, 06:09 PM   #25
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On A, the wires appeared to be okay. What would I find if I unscrewed the switch? Any surprising components inside, that I might not be able to put back together?

Thanks so much in advance!
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Old 04-27-2017, 06:15 PM   #26
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is there not a connector a few inches up on that? if you unscrew that switch you'll have transmission fluid coming out.. and DONT START the truck with it out and press or reverse or you would SPRAY fluid everywhere..

if you pulled it out, and key on but not running.. and are able to measure 12 volts across the 2 wires of that switch (at its plugin) then you have a short to ground downstream of the switch.

I believe that switch is on the positive side.. I dont have the diagrams handy for that but if I remember right its on the + side..

-Christopher
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Old 04-30-2017, 08:10 PM   #27
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Thanks Christopher.

I didn't see a connector. I'll crawl back underneath in the morning to check further up (pretty hhard with a broken rib!)
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Old 05-11-2021, 11:44 AM   #28
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Quote:
Originally Posted by Jolly Roger View Post
Mine was the pressure switch in the tranny(545) that was bad. I was able to verify that it was the problem with the bus parked and in neutral by pulling the wires at the switch and jumper them together to make the connection.
When the pressure switch stopped working, did the trans not engage in gear? My trans won't shift in reverse or drive. And the back up lights and alarm stopped working too.
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Old 05-11-2021, 03:32 PM   #29
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no everything still functioned normal except for the light.
have you checked your shift linkage?
can disconnect the linkage and manually shift it into reverse?
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Old 05-11-2021, 05:28 PM   #30
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When the pressure switch stopped working, did the trans not engage in gear? My trans won't shift in reverse or drive. And the back up lights and alarm stopped working too.
Tell us the details on what bus you have, and what transmission you have. Do you have an automatic with a T-handle shifter, or a press-button shift-controller; or maybe you have a bus with a manual tranny?


If you can't shift into reverse, the backup lights won't come on. The pressure switch won't affect the ability of the tranny to shift.
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