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Old 09-10-2021, 10:45 AM   #1
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Rocker Switches

2005 Thomas with front and rear floor heaters removed. What does the "pump" rocker do? I've read the pump is for the heaters, but it was all speculation. Looking for facts only and not more guesses.


Also curious what the "noise" rocker does.


There are two rockers for mirrors. I'm assuming top, and bottom bubble mirrors. Any reason these can't be combined?



On the dash, there are two switches that spring back to their original position when pressed. "fast idle" and "ecm". I would also like to know what these do.


Thank you.

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Old 09-10-2021, 12:13 PM   #2
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You can raise the idle RPM and then hit the high idle and it will lock it in like cruise control in neutral. Low idle cause twice the wear and tear than normal running. You don't want to low idle the motor for long periods. Both mirrors on one switch is not good, what if only one needs adjusting? Are you sure they are top and bottom, and not left and right?


https://learndiesels.com/8-idle-facts/
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Old 09-10-2021, 12:16 PM   #3
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No, I'm not sure. I need to replace the mirrors as well but the wires don't plug in. They seem to run all the way to the panel. I suppose left and right make more sense.



Any info about pump and noise?


Thanks!
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Old 09-10-2021, 01:55 PM   #4
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No, I'm not sure. I need to replace the mirrors as well but the wires don't plug in. They seem to run all the way to the panel. I suppose left and right make more sense.



Any info about pump and noise?


Thanks!
The "pump" is turned on to boost coolant circulation to the cabin heaters.
The "noise" switch shuts off exit warning alarms.
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Old 09-10-2021, 01:57 PM   #5
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The pump rocker isn't needed for any overheating? I may just take the pump out if that's the case.
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Old 09-10-2021, 02:02 PM   #6
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The pump rocker isn't needed for any overheating? I may just take the pump out if that's the case.
Unless you are removing the heaters an old trick for over heating motors is to turn the heater on high. This give the hot coolant more paths for cooling. It's a band aide help at the time your overheating.
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Old 09-10-2021, 02:06 PM   #7
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I think I know what the "ECM" switch does, but it would be a guess.
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Old 09-10-2021, 06:06 PM   #8
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Unless you are removing the heaters an old trick for over heating motors is to turn the heater on high. This give the hot coolant more paths for cooling. It's a band aide help at the time your overheating.
That's not an OLD trick, it's fairly recent as I remember my father using it an I'm not OLD.......cough, choke....lol
It's a VERY effective band aid and has come in handy numerous times when climbing hills with a heavy load.
To the OP, if you're going to remove the switch you may as well remove the pump it activates as well. But be sure not to remove your defroster lines unless you've got a replacement system in mind.
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Old 09-11-2021, 07:28 AM   #9
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Thanks, I'll look into removing the heater pump.
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Old 09-11-2021, 09:31 AM   #10
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Noise switch

I think that kills power to the “stuff” that adds sound on the bus, like radio and all of those heater fans and air conditioning fans. The idea, I think, is make it easier for the driver to hear.


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Old 09-22-2021, 08:24 PM   #11
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Quote:
Originally Posted by o1marc View Post
You can raise the idle RPM and then hit the high idle and it will lock it in like cruise control in neutral. Low idle cause twice the wear and tear than normal running. You don't want to low idle the motor for long periods. Both mirrors on one switch is not good, what if only one needs adjusting? Are you sure they are top and bottom, and not left and right?


https://learndiesels.com/8-idle-facts/

thanks for the link, lots of good pages there for beginners like me.
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Old 09-22-2021, 08:29 PM   #12
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I think that kills power to the “stuff” that adds sound on the bus, like radio and all of those heater fans and air conditioning fans. The idea, I think, is make it easier for the driver to hear.


William
I think it's specifically for use when crossing railroad tracks, since you're supposed to stop and listen for oncoming trains in addition to looking both ways for them. I'm training to be a school bus driver and that one has been drilled into my brain.
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