electric short on rrc

[figgy]

my rrc battery  drained the battery  and would not start .the AA checked it out and found a 5amp current drawing with nothing switched on and ignition off  .iam going to remove the  fuses  and test to  see if i can trace the fault . any one got any tips or had similar problems 

[Skibum346]

I once had a 1984 RRC where the wire from the gearbox (reversing switch?) had worn through the insulation. discovered it when rooting around and suddenly releasing the magic blue smoke... exciting when yer hand is stuck up the top of the gearbox I cn tell you!

Might be worth a shot... but it would involve some major surgery to get decent access... removing the centre console and drillinbg out the rivets on the transmission tunnel cover for one.

Good luck otherwise.

Skibum

[Bowie]

Pulling fuses is the best way -you will definitely find it that way.

I had this, and found it was the timer relay for the electric window sticking on -which also allowed the rear wash wipe to work with the ignition off  :roll: I pulled the relay and just remembered to do the windows before I pulled the key out the ignition :)

[JIMBOBLY]

well,if its draining over night,then obviously its something that has a permanent live feed,i shouldnt have a look at the wiring on the back of the door switches for the interior light,and the wiring to the red lights in the doors that come on when you open the doors,maybe the wiring broke where the wiring goes into the door,just a thought,as ive had this with mine

[figgy]

after checking out fuse by elimination i found that the fuse for the "ignition feed for multi -function unit ,  " after removing this fuse and reinstalling this fuse the drain disappeared . iam told that the multifunction unit  monitor   several systems  .

[Range Rover Blues]

Yes it does, there is a self-test for it too but I can't remember it, the same unit went on 300 Disco too.

The MFU runs the rear wash-wipe, the interior lights, the heated front and rear screens plus it has links to the headlights and alarm.

[figgy]

i found this test procedure on another forum and will give a try tomorrow

 RE: multi-function unit
 
Ok, this is what I have. Good title for searching, so I'll put it on here if anyone needs it later. Kinda fun to check anyway.

Diagnostic Procedure
1. Close all doors and the tailgate.
NOTE: If the oil pressure switch goes open circuit
(engine is started) during the following procedure,
the MFU will exit the diagnostic mode immediately.
2. Press and hold the heated rear screen switch
and switch on the ignition.
3. Release the heated rear screen switch within 2
seconds and the MFU will beep to indicate that it’s in
diagnostic mode 1.
4. Press the heated rear screen switch; the MFU
will beep twice. In turn, operate each of the following
switches, heated front screen, rear fog guard lamps,
side lights, headlights, front wiper and rear wiper.
The MFU will beep twice each time a switch is oper-ated.
5. Pressing the heated rear screen again will cause
the MFU to enter diagnostic mode 2.
6. The MFU will provide outputs to the following in
order given below:
 Heated rear screen relay energised for 2 seconds
 Heated front screen energised for 2 seconds
 Courtesy lights energised for 2 seconds
 Dim dip relay energised for 2 seconds
 Rear fog guard lamp energised for 2 seconds
 Headlamp power wash energised for half a second
 Front wiper energised for half a second
 Rear wipe/wash energised for half a second
7. The MFU will then exit the diagnostic mode.

[Range Rover Blues]

That's the one.  Just remember that the dim dip isn't used, the MFU is a standard Rover group part and was used on Disco, RRC and other Rover cars.