re. Load reduction relay x-track '84 cgt

[Ben Swann]

I looked at the wiring diagram for the early '84 Coupe with Sean as his car
is #9 in my driveway.

Anyway,  X or Load reduction relay as far as I can tell only carries
ancillary equipment like wipers, defrost, and nothing to do with the
engine.

What we have observed with the engine running, is that it appears to cutout
after the fan starts cycling.  It appears to be electrical.

For some reason even after changing voltage reg. and or alternator several
times, their is no charging.  We observe that the voltage diminishes
somewhat over time, although I don't beleive this is causing the engine to
cut-out, as I have an '85 coupe that runs happily for an hour without an
alternator belt.

The cheater wire appears to me to be a bastard cludge, and has no business
in the car.  If an additional power wire or ground needs to be run, there
is a proper way to do this.  The wire eminated from one of the empty relay
slots - like unused cab or police, which would have been ok, except that it
then goes up and out through the engine compartment and kind of wraps
around the car on down all the way to the pump - pretty sloppy.  Based on
your comment below, you imply that the existing fuel pump wiring is
inadequate to run the pump and CIS control.  I guess we can look at that.

We tried substituting an ignition swicth - still cuts out.

I am beginning to suspect there may be some harness meltdown going on.
 Sean has been methodiacally isolating the problem however.

Anyway, any hints or tips about wiring deficiencies in this particular
model would be helpful.

Ben

[Hi there,

Last time I had a problem with that circuit it was the ignition switch
that was faulty. The lr relay gets its switching feed from the ign switch
and if that's duff you get no lights, fan etc etc. Not sure if what you
have matches that but when I had that problem my car was running, the fp
was running alright. Are you sure (I can't remember if it is or not!) the
fp is in the x track switched by the lr relay? I'm not sure that would
make sense as you don't want the fp switched off with the other bits
and bobs when you turn the ignition key do you? Anyway, if you can find
the feed for the lr relay coming *from* the ign switch, check it when you
turn the key to start the car. May also be worth wiggling the key a bit to
see if that temporarily "fixes" the problem.

keep us posted with how it works out

hth

Graham.

These are all components that are on the X
track and run through the load reduction relay.  The fuel pump relay is on
this track as well and was not working when I purchased the car.  There was
a "cheater wire" running from under the driver-side dash to the fuel pump
to
make it work.  That wire was plugged into a switched 12V terminal that
comes
on with the ignition.  This terminal is in an "empty" relay socket(this
should sound peculiar). ....I am very interested in that "empty" relay
socket that had the cheater
wire hooked into it.  I am wondering if there is supposed to be a relay of
some sort there??

Sean,
It doesn't sound parculiar to me!  I also have a cheater wire there to flip
on an FP relay that I have under my rear seat, to save the overloaded
circuit.  Is this empty slot on your fuse box right next to brass colored
"Z" plug into the box?  If so it has been empty on every UrQ and 4000 I
have
owned.  mAybe for an option I never had or simply an empty slot.  Glad to
have an easily accessible switched on power source for many electrical
items
over the years!
Mike]