Classic ZF trouble..?? 87FC35

[one_dusty_hoot]

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
> > > > > >
> > > > >
> > > >
> > >
> >
>