Classic ZF trouble..?? 87FC35

[Gregory OConnor]

Alan, when you jump pin 19. also jump the wire that fed pin 19.( may
be a relay/ solenoid that needs amp back line) Sounds like the
starter thinks the trans is in gear. Or try and de energize the
control modual completely, start the rig , then plug in pin 19 with a
new hot. It may not hurt to fuse the new hot with a low amp glass
fuse. You could ask zf what the amp draw should be and if it pops
the fuse you have a short some place that may only happen after some
event. If all else fails just rent a Lodge from MikeH.
GregoryO'Connor
94ptRomolandCa
--- In WanderlodgeForum@yahoogroups.com, "Alan"
wrote:
>
> 5pm Monday update:
>
> I spoke to Dan at ZF trans in Chicago. He was extremely helpful.
> We verified I do have low voltage. (7.5v) On my control module
> wiring harness, pin #19 is the hot wire. He told me I could jumper
> it from a 12 volt source until I locate my problem. I was anxious
> to try this to move my coach from in front of my house (so my
> neighbors don't get upset).
>
> I started the coach, applied 12 volts to pin #19 and the
> transmission engages better than it has in the 2 months i've owned
> it. So, I turn it off. Put a few things up and get ready to
> relocate it to my back yard.
>
> Now the coach won't turn over at all. I also discovered my front
> load panel has a 75amp relay. I was only getting 7.5 volts out of
> it to my lower row of circuit breakers. I subsequently bypassed
> this relay, but the coach still won't turn over. Is there another
> ignition relay somewhere?
>
> Ideas?
>
> Thanks,
> Alan Johnson
>
>
> --- In WanderlodgeForum@yahoogroups.com, "Gregory OConnor"
> wrote:
> >
> > Alan, the other half of power supply is ground. Worth a check.
> > Gregory O'Connor
> > 94ptRomolandCa
> >
> > --- In WanderlodgeForum@yahoogroups.com, "Alan"
> > wrote:
> > >
> > > It seems I am experiencing the classic ZF trans problem of not
> > going
> > > into gear. It has been kind of slow engaging lately and now it
> > > won't move. **One potential variation is that I noticed my
> > > tachometer does not seem to be registering properly. At idle,
> > > sometimes it was reading around 1500 rpm, and sometimes it's a
> > > little irratic. (The engine is idling normally.) But I don't
> know
> > > if there is a connection between what my tach registers and the
> > > trans.
> > >
> > > So i've read all the posts here I can find about this. I have
> > > located my throttle position sensor and it appears to be in
tact
> > and
> > > functioning. I'm now on to the next thing potential problem
and
> > > that is a the low voltage problem. I have also found the fix
in
> > the
> > > database. The fix says to check the voltage and find the ZF
> power
> > > supply. I've found what appears to be ZF control module. It
is
> > > located underneath the push button gear selectors behind a
> panel.
> > > It has a large connector on top of it with lots of wires going
> into
> > > it. I HAVE NOT found what might be the power supply.
> > >
> > > So I've got a couple of questions if any one has experience
with
> > > this:
> > >
> > > 1. Where might I look for this power supply. (What does it
look
> > > like?)
> > > 2. When I find it, I can use a Fluke, so I am anticipating no
> real
> > > problems in getting to checking voltage..?? Yes?
> > > 3. If I do find a problem with the power supply, the fix
> instructs
> > > me to "retrofit a new power supply". Is this something I can
> get
> > > from BB or ZF?? Or something I can pick up at Napa??
> > >
> > > Thanks in advance,
> > > Alan Johnson
> > > 87FC35
> > > Dallas, TX
> > >
> >
>