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Old 12-10-2017, 11:21 AM   #1
Mini-Skoolie
 
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Join Date: Feb 2017
Location: Bremerton Wa.
Posts: 19
Year: 2002
Chassis: Thomas
Engine: Dreaded 3126 - 545
Angry 2002 Thomas FE 3126 wont start after unplugging emergency door switch


First off introductions.
I am a long time lurker of this forum and have already done and sold a Skoolie in the Mid 90's. 76 GMC Carpenter 366 gasser converted for the bullet proof camping/hunting rig.

Currently I have a 2002 Thomas FE 30 foot handi bus with the dreaded 3126 and 545 combo.

Situation: Unplugged the back emergency door switch and removed the connection #5 on the yellow box inside the compartment outside the drivers window for the stop sign.

I was in the process of removing the "School Bus" related items and now I have a dead bus..

I completely re-attached the two wires that I previously unplugged and now still dead.

When I turn the key to on position all 12 volt accessories work however there is no indication of the pre-startup diagnostics/glow plug warm up.

The bus does turn over but will not start. I have searched exhaustively on this and many other resources and come up blank.

There are no Vandal locks everything is back to where it should be but still no avail.

I do need to put some juice back in the batteries as I have been trying to figure this out on my own. (Pride Thing)

- Every door has been opened and shut multiple times to make sure that is not it.
- Emergency hatches are completely shut and latched.
- Tried cycling the shifter to ensure it was not the neutral safety switch.
- Pointed left butt cheek towards north star while standing on one foot
- Checked every fuse with meter and no magic smoke has been removed.
- Connections to Battery look great as this bus was in service up to the date I bought. Tacoma Washington School District.
- Up to the aforementioned dilemma bus has performed flawlessly.
- Has one of those Child push button thingamagiger on the back door and I have pushed it in all possible combinations possible.

Every post I have read have been totally opposite of the condition I am experiencing. Mine turns over just no start and no cycling of gages.
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Old 12-10-2017, 12:21 PM   #2
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Perhaps your interlock system is tied in with your electrical fuel shutoff valve.

If you're sure things are rewired correctly, perhaps disconnect the battery for a while, then reconnect so your computer resets.
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Old 12-10-2017, 02:22 PM   #3
Mini-Skoolie
 
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Location: Bremerton Wa.
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Year: 2002
Chassis: Thomas
Engine: Dreaded 3126 - 545
Robin,
Didn't work. Disconnected batteries for an hour and still same issues. Went over all connections previously screwed with just to make sure and no avail.

I know I need to put some juice in my batteries currently at 12.2 volts measured with Fluke on batteries. Would that low of voltage prevent the startup diagnostic when the key is put in the on position.

Motor still turns over just with not with the gusto previously.
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Old 12-10-2017, 02:32 PM   #4
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Join Date: Jun 2013
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Year: 1997
Coachwork: Bluebird
Chassis: GMC
Engine: Cat 3116
Rated Cap: 72
I agree with you. Charge those batteries up but top them up first with distilled water. Are those cable connections good at the batteries, starter and ground?
The speed of the starter adds to the heat needed for combustion so a slow starter isn't helping you.

John
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Old 12-10-2017, 02:57 PM   #5
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Thanks for the reminder to top off the cells, John. I'd cleaned my terminals and such as part of fall maintenance previously, but just recently bought another jug of distilled water. No plates were showing but it took nearly three quarts total.
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Old 12-10-2017, 03:11 PM   #6
Mini-Skoolie
 
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Location: Bremerton Wa.
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Year: 2002
Chassis: Thomas
Engine: Dreaded 3126 - 545
Robin and John,

Thanks for the replies I will do just that. The only thing that still has me confused is when the key is put in the on (not start) position there is no indications of the glow plug preheat and the gages do not cycle.

That is where I am perplexed.

Is there something in the ECM that controls that if there is not enough juice?
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Old 12-10-2017, 03:19 PM   #7
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Sorry, I chose an all mechanical system so I didn't have to get headaches from electronics problems.

John, your up.
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Old 12-10-2017, 03:21 PM   #8
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Year: 1997
Coachwork: Bluebird
Chassis: GMC
Engine: Cat 3116
Rated Cap: 72
[QUOTE=ShagNasty;238349]Robin and John,

Thanks for the replies I will do just that. The only thing that still has me confused is when the key is put in the on (not start) position there is no indications of the glow plug preheat and the gages do not cycle.

That is where I am perplexed.

Is there something in the ECM that controls that if there is not enough juice?[/QUOT

There must be a sensor on battery voltage but don't ask me where that is.
You need a long slow charge , possibly 24 hours to get back to normal capacities. One or tow batteries? Charge each individually also.
No gauges at all seems strange unless a battery conservation measure for the power they still have.


John

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Old 12-10-2017, 03:25 PM   #9
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Year: 1997
Coachwork: Bluebird
Chassis: GMC
Engine: Cat 3116
Rated Cap: 72
Quote:
Originally Posted by Robin97396 View Post
Thanks for the reminder to top off the cells, John. I'd cleaned my terminals and such as part of fall maintenance previously, but just recently bought another jug of distilled water. No plates were showing but it took nearly three quarts total.

Robin, yw...just be careful now they don't bite you back. they should have a lot more punch now if they are charged properly.
It's those little things that make for a happy bus.

John
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Old 12-10-2017, 03:44 PM   #10
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Yes, the little things count. I'm pretty good on preventative maintenance.

Previously, when it was still warm, I didn't have any remaining distilled water while servicing the battery terminals. I'd used it all up in my coolant replacement. But thanks for the reminder. It would have eventually caused a problem. My battery hasn't shown any signs of weakness and I want to keep it that way.
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