Engine & Tranny problems 2

[Chuck Wheeler]

Ron, agree with Greg and would want to find the problem BEFORE a replacement
the ECM is replaced. To pull that kind of heavy current there is a problem
on one of the DC busses. If my memory is correct you recently did some
alternator work. If so start there, check each alternator output
independently, if they are good go around the coach and check all DC items
especially chargers, inverters, connection between the generator 12vdc and
the main bus. Inspect as much as possible. I would expect to see or
smell something.



- Chuck Wheeler -

82 FC 31 SB

Fort Worth, TX

_____

From: WanderlodgeForum@yahoogroups.com
[mailto:WanderlodgeForum@yahoogroups.com] On Behalf Of Gregory OConnor
Sent: Monday, April 23, 2007 11:59 PM
To: WanderlodgeForum@yahoogroups.com
Subject: [WanderlodgeForum] Re: Engine & Tranny problems 2



Ron, Often overlooked by class 8 repair shops are the high amp high
discharge /recharge inverter drawn powersource on a motorhome. The
uncommon factors sometimes reveal possible conclusions. I would pull
all 11 batteries (disconnect) and install one proven battery at the
engine start bank to continue the test. The Carvers had wierd
problems that proved to be bad batteries. I hope it is somthing
easily correctable.
GregoryO'Connor
94ptRomolandCa

--- In WanderlodgeForum@
yahoogroups.com, "ronmarabito2002"
wrote:
>
> I had to pull into Stewart & Stevenson in Albuquerque with engine
> power problems and shift problems. It all started after we left
> Dallas yesterday. I had a sudden 170 amps and 10 volts, followed by
> total loss of 12 v power to instruments, radio, etc... By the time
I
> was off the road, the power was back. I then noticed a lack of
power.
> Pulled some minor grades of 2 or 3% with a drop in speed to 50 mph
at
> full throttle.
>
> Nursed the unit in to Albuqerque this morning. Had a fuel gage
> intermittent that went from normal to full peg on full. When
making a
> hard left turn, transmission check light would flash and beep.
>
> S & S did a power check and found at full throttle, engine could
only
> make 1900 rpm. When backed off, the rpm went up to 2200. Just the
> opposite of normal. They are very suspect of the DDEC2 at this
point,
> but are trying to rule out everything else first. Changed air
filter,
> they were started on a fuel system check when I left for dinner. I
> had checked all the connectors this morning and they were fine.
Could
> not trouble shoot because I have no diagram of those circuits.
>
> I know the grounds on the alternators and engine to chassis are
fine.
> Not sure about any others, but they are checking them.
>
> I'm convinced that whatever caused that electrical anomoly
yesterday,
> damaged the ECM and it will probably have to be replaced. $$$$
>
> Let you know more tomorrow.
>
> R.E. (Ron) Marabito, Dallas, TX 92WB40
> Currently in the shop in Albuquerque, NM
>





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