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Electrical Discussion of preventative/corrective maintenance and other technical issues regarding your coach's electrical system.

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  #1  
Old 12-24-2008
Matt Winstanley Matt Winstanley is offline
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Join Date: Dec 2008
Location: Stafford, VA
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Unhappy Allison transmission (electrics)

My 95 42wb has been sitting for a few months and I am needing to move it now. Although there were quite a few electrical 'quirks' when I first started to charge it, everything now seems ready to go...except the tranny display is ' + +'. I was told that this was indicative of low battery voltage, but the voltage is around 14 volts. It did read 'N' before I reeled up my power line 'it was not plugged in' when 'N' happened. I did get a brief 'N' but that quickly changed to ' ++'. Any thoughts...

Matt
'
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  #2  
Old 12-24-2008
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rwoody rwoody is offline
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Location: Pleasanton
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The Regular Push Button Selector is powered up by the Transmission Electronic Control Unit (ECU) from Terminal 16 of the "S" Black connector to terminal R of the Push Button Connector located at the back of the display. The Push Button Display also receives its sensor power from terminal 3 of the same ECU connector to terminal N. The battery return or ground signal is supplied from terminal 32 of the ECU connector to terminal P. Without power and ground to the noted terminals the display will not illuminate and unfortunately the engine will not start, as this is also your Netural Safety Device.. The ECU gets its power on terminals 1 and 16 of the "V" Gray connector. Some ECU's are powered through a 10amp fuse inside of the Vehicle Interface Module (VIM) out on VIM pins R1 and R2 and in on J1 and J2 from the battery, others as in my case are powered through a 10amp fuse direct from the battery. NO POWER TO THE ECU means the ECU cannot power up the Neutral Start Relay, the Push Button Display and the Control Module in the Transmission.
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2003 LX Single Slide Hauling Wood 5
2 miles east from Texas Highway 37-97
Just a Hobby Shop now-Bird Repairs upon Appt and my Schedule -USAR Retired
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Old 12-25-2008
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rwoody rwoody is offline
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i would pull a print on the bus and see where the allison interfaces with the BB.....

its a ground or a + that is not making the mark.....

a little more back ground is needed???????

the coach been sitting a long time??

first time it did this??????

i cannot tell but i think that the batterys are/were changed or charged???

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RWoody
2003 LX Single Slide Hauling Wood 5
2 miles east from Texas Highway 37-97
Just a Hobby Shop now-Bird Repairs upon Appt and my Schedule -USAR Retired
Pleasanton Tx 78064
Do not use PM... please use
rwoody@fullnet.net
http://www.ebay.com/usr/woody19571

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