Classic ZF trouble..?? 87FC35

[one_dusty_hoot]

Alan, According to drawing ZF-1255157

From a 11 pin plug:
Pin #5 (blk/yel) gets voltage from a 20A breaker of the ignition
circuit. I would think this is a supply voltage for the box.

Pin #4 (red) supplies voltage directly to the starter solenoid.

Pin #9 (red) comes directly from the ignition switch.

Sooo.. You should have 12V on pin 9 when you turn the ignition key
to "start". And... This should come out of the box on Pin # 4.

If you have it on pin #4 and not pin #5, something inside the box,
(relay)?? or control from another switch.

Pin #2 is shown as ground, no ground here could cause problems.

Pin #2 would/should provide a good ground referrence for checking
voltages in and around the ZF box.

Just theory suggestions, no practical experience her.
Bob Janes

--- In WanderlodgeForum@yahoogroups.com, "one_dusty_hoot"
wrote:
>
> I have started the 3208 with a screwdriver at the starter solenoid.
> Be sure you are in neutral, key on, brake on, this will by-pass the
> start circuit wiring.
>
> Don't know if there is or is not another relay. Do you have a wiring
> diagram, schematic?
>
> Say could the ZF be in neutral with a lock out on strart? Just an
> idea, I don't know how to confirm. Maybe that low voltage again.
> Bob Janes
>
> --- In WanderlodgeForum@yahoogroups.com, "Alan"
> wrote:
> >
> > Bob,
> >
> > I agree about finding out why I'm only getting 7.5vdc. Here are
a
> > couple of other thing I know.
> > 1. I've got 12v on my batteries (charged new t105s)
> > 2. I've got 12v on my non-ignition circuits. ...so far I've just
> > found the one set of breakers on my lower front breaker panel
that
> > are on the 75amp relay coming off the ignition.
> > 3. I by-passed that relay and now i'm getting 12v to that set of
> > breakers.
> > 4. The coach still won't start. I have checked the "normal"
> > stuff. ...Neutral, a/t switch, 12v coach switch.
> >
> > All this and nothing at all happens when I turn the ignition
key.
> > Is there another relay somewhere other than the 75amp one I
> found??
> > Also, there are two wires coming into that relay that should
> > activate it. I'm not sure I'm getting power to those. Do those
> > come directly off the ignition switch or perhaps another relay??
> >
> > Thanks for your ideas!!
> > Alan Johnson
> >
> >
> >
> > --- In WanderlodgeForum@yahoogroups.com, "one_dusty_hoot"
> > wrote:
> > >
> > > Alan,
> > > You need to know why you only have 7.5 VDC
> > > Start at the battery, check all connections, check with a meter.
> > > Measure across each battery, then the total voltage of the two
in
> > > series. Could you have a defective battery? Maybe a bad ground?
> > > 7.5 V may not cause the starter solenoid to operate, or the
fuel
> > shut-
> > > off solenoid fro that matter.
> > > You find this and you probably will find the transmisson works
> > fine.
> > >
> > > Bob Janes, '87FC35, Greenville, SC
> > >
> > > --- In WanderlodgeForum@yahoogroups.com, "pattypape"

> > > wrote:
> > > >
> > > >
> > > >
> > > > Alan,
> > > >
> > > > Not trying to simplify your problem, But I would try the
easy
> > > stuff
> > > > first. Check, the Neutral button, the Anti/Theft switch
on
> > the
> > > > dash, and the 12 volt master shut off.
> > > >
> > > > Bill 88 FC Michigan
> > > >
> > > >
> > > > --- 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
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>