Classic ZF trouble..?? 87FC35

[Alan]

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
> >
>