Troubleshooting Bendix Fast Idle/Cruise Control on 89 35FC 3208 ATAAC

[Richard Gideon]

My multimeter testing indicated the potentiometer to be faulty or at
least out of tolernce. I tested with the 'pot' still on the coach
and now am traveling in South Texas and will replace pot in April
after this trip. Parts man named Spark at Seattle Clutch & Brake
fixed me up with a new Bendix pot and spring assembly P/N 101951N.

The CC works poorly but is still useful to allow me to keep my coach
speed above the set speed (cruise control helps pull the injector
pump to 'WOT' wide open throttle.

The high idle still behaves same as when I first bought the FC back
in Sept 2006, i.e. goes to 3000 rpm immediately when pressing the
resume switch on the CC panel.

Dick Gideon
1989 35 FC
On the road, Canyon Lake, Texas


--- In WanderlodgeForum@yahoogroups.com, "Richard Hayden"
wrote:
>
> Still is not working even with the new CC-5. I'll look into it
later after we've settled at the winter quarters. Leaving tomorrow
morning.
>
> Dick Hayden - '87 PT 38 - Lake Stevens, WA
>
> ----- Original Message -----
> From: Curt Sprenger
> To:
WanderlodgeForum@yahoogroups.com om>
> Sent: Monday, October 15, 2007 3:20 PM
> Subject: Re: [WanderlodgeForum] Re: Troubleshooting Bendix Fast
Idle/Cruise Control on 89 35FC 3208 ATAAC
>
>
> Dick,
>
> FYI in case you need a CC-5 unit. The CC-5 unit is no longer
manufactured. A
> couple of us just purchased CC-5 potentiometer units through
Brake & Clutch
> Supply, Seattle, Washington. Talk to Spark. I bought one for
possible
> future need. Dick Hayden bought one because his CC was not
working.
>
> On 10/15/07, Richard Gideon >
wrote:
> >
> > Thanks for the reply Ralph: Early this morning I got into
my "blue
> > box" and retrieved the booklet describing the operation and
> > troubleshooting the Bendix Cruise Control System (SD-10-1)and
on page
> > 15 of the booklet I found the symptoms, cause & remedy for what
> > appears to be ailing the CC on my FC.
> >
> > V. Cruise Control System oscillates above and below the speed
> > setting. Will not hold a specific speed setting within plus or
minus
> > 1 mph on level highway.
> >
> > Cause, CC-5 potentiometer or its wiring is defective.
> >
> > Remedy. Visually inspect for broken or obviously damaged wiring
to
> > the CC-5 potentiometer (Figure 13). Disconnect wiring connector
3 in
> > Figure 13 and check the resistance between the sockets shown:
> >
> > 1 and 3 3600-4400 ohms
> > 2 and 3 1080-1320 ohms
> > 1 and 2 4320-5280 ohms
> >
> > If these readings are not obtained, replace the CC-5
potentiometer.
> >
> > I'll post later this week, with the results of my testing.
Thanks
> > for the guidance...I"ll dig out my digital volt/ohmeter.
> >
> > Dick Gideon
> > Freedom Bird
> > 1989 35FCSB
> > Rolla, MO
> >
> > --- In
WanderlodgeForum@yahoogroups.com om>,
> > "Ralph L. Fullenwider"
> > wrote:
> > >
> > > PT cruise/air throttle/high idle
> > >
> > > Some time back, I posted to the files section, a couple of
files
> > on how
> > > these systems work and inter act.
> > >
> > > As for the FC's it is a little difference because the factory
<BB>
> > dip
> > > switch settings allowed the fc cruise controls to work
slightly
> > different
> > > than the PT's.
> > >
> > > As for the problem in the FC, where it is on or off and no in
> > between, I
> > > would suspect the CC5 potentiometer internal of the cylinder
to be
> > faulty.
> > > All this can be checked with a decent Multimeter and
following the
> > checks
> > > in the Bendix manual that should be in the blue box.
> > >
> > > The only thing I have found that was done a little funky form
the
> > factory,
> > > is how the clutch switch was wired up since there are no
clutches
> > in the
> > > Birds and that was done with 2 solenoids in the system. I have
> > actually
> > > taken those out of the system to get my cruise working
properly and
> > that
> > > was done with a pair of side cutters! One snip and you
have
> > cruise.
> > > Now the problem with the break pedal not canceling the cruise
is or
> > has
> > > generally been a bad set switch or corroded contacts in a
> > connector. And
> > > can usually be cleared up by cleaning the pin contacts coming
from
> > the
> > > Bendix control.
> > >
> > > Remember that our Coaches put out 120 to 130 psi of air and
there
> > is a
> > > regulator with the bendix set up to drop that pressure to 80
to 90
> > psi,
> > > thereby making the working difference of only a few psi
> > differential that
> > > the electronics of the bendix system reads and enacts on.
> > >
> > > >
> > >
> > > Safe travels,
> > >
> > > Ralph and Charolette Fullenwider
> > > 84FC35
> > > Duncan, Oklahoma
> > >
> >
> >
> >
>
> --
> Curt Sprenger
> 1987 PT38 8V92 "MacAttack Racing"
> Anaheim Hills, CA
>
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>
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