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Old 04-06-2013, 08:01 PM   #1
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1993 coach , electrical problem

If anyone could give an insight !!

my brother in law just bought a 1993 coach m/h 36 ' Nice rig, but he parked it at his house and now cannot get the rig to start, it has all new batteries, and he has no
power to the transmission, cannot shift or even start the unit, power to everything else.

cummins Diesel engine , with 6-speed Allison push button automatic tranny, no power to the transmission shifting indicator.

any help would be appreciated !!
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Old 04-06-2013, 08:22 PM   #2
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Quote:
Originally Posted by harleydawg53 View Post
If anyone could give an insight !!

my brother in law just bought a 1993 coach m/h 36 ' Nice rig, but he parked it at his house and now cannot get the rig to start, it has all new batteries, and he has no
power to the transmission, cannot shift or even start the unit, power to everything else.

cummins Diesel engine , with 6-speed Allison push button automatic tranny, no power to the transmission shifting indicator.

any help would be appreciated !!
Check the chassis/engine batteries. They are separate from the "house" side on RVs. If there is a "house assist" switch, try it to see if the unit will start. This jumpers the house battery store to the engine side for starting in cases where the engine batteries are exhausted.

In your next post, it might help if you would mention what brand of motorhome this is. Individual brands have idiosyncrasies that owners have experience with.
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Old 04-06-2013, 08:44 PM   #3
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Originally Posted by Mojavian View Post

Check the chassis/engine batteries. They are separate from the "house" side on RVs. If there is a "house assist" switch, try it to see if the unit will start. This jumpers the house battery store to the engine side for starting in cases where the engine batteries are exhausted.

In your next post, it might help if you would mention what brand of motorhome this is. Individual brands have idiosyncrasies that owners have experience with.
Sorry; Should have specified, It is a Coach, model ; Safari, , ivory edition , power to the dashboard when ignition key is turned on, no power to the shifting indicator to allow starting of the engine !
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Old 04-07-2013, 05:53 AM   #4
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Back in those days the Allison Transmission controller (WTEC-II) needed to be isolated from the chassis batteries therefore most all of them were wired/powered by the house batteries. (There is no built-in logic in the WTEC-IIs to prevent starting the engine if the Transmission controller doesn't see power).

Are the house batteries connected and good?
If not, this is why you're not seeing any display on the shiftpad - however, that will not prevent you from starting the engine - IF the chassis batteries are good and grounded well.

You mention power to the dash is ok... when you turn the key does the dash go dim? Any audible "clicks" from anywhere under/at the rear of the motorhome?

As many have stressed in the past, and I'll stress again, grounds, grounds, grounds, (did I mention grounds?) account for probably 3/4s of the problems in older coaches. In many cases you must find where the grounds attach to the chassis, remove them, grind to get good clean metal and re-attach them. Oxidization occurs readily under ground mounting points .
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