Update on ZF trouble 87FC35

[Alan]

FIXED!!!!! Whew. I put up a post on a new thread that describes
the problem and fix. Thanks for all your help. I think I
documented it pretty well for future reference, but if something
isn't clear, let me know and I'll clarify.

If that problem had gone on much longer I might have given it to
you, Jeff.

Thanks!
Alan

--- In WanderlodgeForum@yahoogroups.com, "Jeff Miller"
wrote:
>
> First, I am just getting caught-up on this problem, so bear with
me
> if I've showed up in the middle of the movie.
>
> If the coach won't start with the ignition key, look at that
problem
> first. If the ignition switch isn't getting proper power then the
ZF
> probably won't either.
>
> The ZF has a relay box, a flat aluminum box, has three connectors
> plugged into it. I have a spare (new) one here, but since it is
> simply a few Bosch relays on a circuit board inside, easy to
repair
> if it is the problem. This box supplies power to the ZF.
>
> There are two wiring diagrams for the '87 FC/ZF, 1255157 inactive
3-
> 17-87 and 1314327 the later one. The early one ('157) has three
> connectors on the relay box: 11pin/4pin/8pin. We'll start with
this
> early one. The power comes from: a red wire from the ignition
switch;
> a white/green wire from the ignition terminal of the terminal
switch
> above the main batteries; and a 20a ignition-hot circuit breaker.
>
> The later version ('327) is powered similarly with the addition of
an
> orange wire off of an 8a ignition-hot circuit breaker, this relay
box
> has three connectors also but they are 13pin/4pin/8pin.
>
> With the ignition on, check the voltage and check with a light
also:
> the body-hot terminal and ignition terminal on the battery-
> compartment terminal switch, then with the grille and left
> wiper/access panel open check all of the load-side terminals on
all
> of the circuit-breakers behind that panel. You might also pull the
> small panel out of the dash (first) with the ignition switch to
see
> if there is proper power to/from the ignition switch, changing
that
> switch in an '87-'89 FC is a 5minute job at worst.
>
> Good luck, hope I gave you some useful info, not just more
confusion.
> BTW the master wiring, chassis drawing for your coach should be
> 1284967.
>
> If all is lost, I'm currently 'Birdless and accepting donations,
will
> take it off of your hands ;~)
>
> - Jeff Miller
> in Holland, MI
>
>
> --- In WanderlodgeForum@yahoogroups.com, "Alan"
> wrote:
> >
> > Well, after many hours this is where I currently am.
> >
> > 1. I have zero volts going to my ZF ECU.
> > 2. The coach won't start. Now I'm pretty sure that's because
> > without voltage to my ECU, the coach doesn't know if it's in
gear
> or
> > not. (I can jump my starter solenoid and it starts.)
> > 3. I talked to Dan at ZF in Chicago and he was quite helpful.
He
> > told me how to check voltage on the ZF. BUT he didn't know where
> the
> > ZF gets it's power off the coach.
> > 4. I am getting volts out of my 75amp ignition relay with the
key
> > turned on.
> >
> > There are bunches of ZF wires behind the grill in the steering
> > column access panel. There are also two silver boxes with what
are
> > apparently ZF wires going in and out of them. The boxes are
about
> > 4" x 4" x 1". However, I know these aren't the ZF ECU. It is
> > located underneath the push-button gear selectors by the driver.
I
> > don't know if they have anything to do with power.
> >
> > Questions (If anyone knows):
> > 1. Where/how does the ZF get power from the coach?
> > 2. Does the power go through the filtered power source under the
> > couch?
> > 3. What would keep me from getting any power to the ECU?
> >
> > Tomorrow I'm ordering a full set of electronic drawings, but in
the
> > mean time my neighbors would appreciate it if I can get the
coach
> > moved from the street.
> >
> > Thanks,
> > Alan Johnson
> > 972.769.2526
> > 87FC35
> >
>