In reply to a message from blueduck sent Sat 23 Jul 2011:
Quite clearly you have a dead short to ground on the
Red/brown wire from pin 87 of the A/C compressor clutch
relay. You can confirm that if you remove the relay and
check for continuity (Ohms range on a DMM) between pin 87
and any ground part on the car.
Where that short to ground occurs is the question. The
wiring arrangement on my '91 car is different to yours so I
cannot advise you on the routing of that Red/brown wire.
As mentioned previously, it could be that the Red/brown wire
has been damaged between the relay base and the compressor
clutch. Apparently, if incorrectly routed, it is possible
for the compressor pulley or drive belt to snag the wire,
strip the insulation and cause a short to ground.
It may be that the windings of the clutch itself are damaged
and offering no resistance to ground - i.e a dead short. I
will PM you the Sanden compressor manual with all of the
details about clutch replacement (see section 10.4 para 2) -
but it may be easier to replace the compressor c/w clutch as
a unit because special tools are required to change the clutch.
Did you find that diode FED1 I mentioned?
BTW the ‘cooling fan’ I mentioned in that earlier post
(behind which the diode is located in the harness) is the
radiator cooling fan, not the aircon blower inside the car
to which you refer.–
The original message included these comments:
ok I did the jump pin 30 to pin 87 test in the air con relay
base and the fuse blew immediately, I still don’t see anything Wrong with the red/brown wire do you thing I need to pull more
out of the wire honest,or it may be the air con clutch thank
Bryan N, '91 Sovereign 4.0 L, RHD
Cambridgeshire, United Kingdom
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