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Author Topic: Transmission warning light,, Why is it on?  (Read 1971 times)
Ed Hackenbruch
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« Reply #15 on: March 25, 2013, 02:59:27 PM »

I probably know even less than Joe, maybe unhook the batteries and let it sit for a few minutes before hooking them back up?
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1968 MCI 5A with 8V71 and Allison MT644 transmission.  Western USA
robertglines1
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« Reply #16 on: March 25, 2013, 04:49:30 PM »

You need a allison/prevost  specialist here.  If memory serves me correct. That trans gets it's operating info direct from the engine ddec system ( engine rpm-Temp etc) so if ecm aren't talking to each other.  You got problems. That is what Clifford meant by big problems. Like maybe Excess of $3500 for correct box.  Was your engine DDEC programed correct for your application when they redid it?  Look for the easy solutions first! Ck all the plug in (deutch connectors)on box in steering compartment. Sorry can"t help but share a little info here. Please do let us know of outcome.  Bob
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Bob@Judy  98 XLE prevost with 3 slides --Home done---last one! SW INdiana
gyoder
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« Reply #17 on: March 25, 2013, 05:49:15 PM »

I don't know much about electronics but if you didn't let the smoke out, I'd think it is probably not damaged much.

It is hard to believe the runaround you are getting.


Since this problem started with battery work, have you rechecked all the cables and wires and ensured they are connected/grounded correctly?

Is/was there a fusible link somewhere upstream of the transmission.



 I have all the batteries are correct now, I have full voltage to all the trans controls, I don't know if there is a fusible link, I have looked and cant seem to see any. Prevost only used this transmission 2 years and it is the first year for Allison to use a electronically controlled unit. Nobody knows much about it.
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luvrbus
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« Reply #18 on: March 25, 2013, 06:19:37 PM »

If the pad lights then the fuse is ok try borrowing a pad it cost about 400 bucks to have a pad rebuilt fwiw a 741 will have the same pad.

If you do buy a different ATEC may sure you don't buy a standalone unit meaning it will work with a mechanical engine I made that mistake once buying from Ebay cost me more to reprogram the unit than I paid 
« Last Edit: March 25, 2013, 06:30:35 PM by luvrbus » Logged

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gyoder
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« Reply #19 on: March 25, 2013, 09:16:26 PM »

If the pad lights then the fuse is ok try borrowing a pad it cost about 400 bucks to have a pad rebuilt fwiw a 741 will have the same pad.

If you do buy a different ATEC may sure you don't buy a standalone unit meaning it will work with a mechanical engine I made that mistake once buying from Ebay cost me more to reprogram the unit than I paid 

thanks
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gyoder
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« Reply #20 on: March 26, 2013, 11:29:21 AM »

The Varnner battery equalizers on this 1992 XL provost , are they part of country coaches installation or are they OEM prevost?

I have looked everywhere for a hint how to check these out , I have a battery low/hi light on in the dash. The book says the equalizers are faulty. I have checked them and they have voltage.

 When country coach took the OEM engine mounted generator off and put an alternator on they didn't take the voltage regulator off of the rear firewall. Don't let that fool you, the alternator is self regulating and self exciting, why they don't take them off is news to me.
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