Transfer Case Gearbox electrical connection question.

[peteb2]

Can anyone shed some light please on a way-ward connector. I've spent the last 2 days trying to find where a round shape two pin plug connects home onto the 13-61-005 transfer case of my 1990 era RR Classic chassis. I've searched on here and Googled plus checked through my service manuals but I am real stuck. I have hunted down pictures of the early model transfer case but i just cannot find any reference to it. Someone suggested it's for a temp sensor because this is a 13-61-005 case running with a 3.9V8.

My thought here is it might be the topside of the Transfer Case is so piled with dried mud that i can't locate the connection place but i have never seen this model case out so i simply don't know.

The concern is this is some kind of status the ECU should be receiving and might be the cause of other issues.

I have worked out there's a loom of total 6 wires that run to the Transfer case and the 4HP-22 Transmission.

The transmission has 4 wires: green (common), green-brown, black-orange and black (common) which provides for Neutral/Start inhibit.

The Transfer Case has a connection point behind the handbrake drum using 2 wires black-grey (joins to the Transmission black common) and a black-purple which is possibly the Diff Lock warning.

The ''way-ward'' is a round female plug connector with a YELLOW and GREEN (the green joins to the Trans green-common).

I hate describing a circuit on just the colours of wires but what i'd truly appreciate is if anyone has a better manual than my CD 1990 RR Workshop Manual. Even a couple of clear pics of a 13-61-005 and it's electrical connections would be perfect.

As always, TIA Pete .... in New Zealand

[peteb2]

This is the connector that no amount of searching can i find a location for on the trans or the 13-61-005 transfer case. Does anyone recognize it please? The fact it's so clean it must have been plugged to something....

[benji]

THe 13-61-005 transer case is the borg-warner one with the viscous coupling.... I think? To me it looks like the speedometer pick up. Out of the back of the transfercase just forward of the brake drum there is a speedo drive unit , this unit drives a morse cable, the other end of the cable is bolted to the inside of the passenger side chassis rail, roughly up above the left hand exhast. Thus it's usually hidden above a heat shield. On this end of the morse cable is an inductor unit for the electronic speedo, and there should be two flyleads out of this, which is where you plug goes into. There should be a C clip (I think on the chassis somewhere) that hold the plug securely.

[peteb2]

Thanks for your help. Nope it's nothing to do with the speedometer sensor. There's a real mechanical flexi-drive cable attached into the location (between transfercase and the handbrake/parking bake drum) you describe that i've traced up to the firewall. I also know what the transducer looks like for those speedos that use pulse instead of mechanical cable drive.

I've 'buzzed out' the 6 connections to what amounts to 3 plugs all associated with the transmission itself and i'll draw up a simple diagram, post the image back here for the record. None of my Rangerover manuals show enough info on their wiring diagrams as to what is happening so it's real strange. I have also Googled like mad for a clear set of pictures of a 13-61-005 which might help me but haven't had any luck. I might have to go visit a wrecker yard...

[peteb2]

More news update.... OH BOY, the embarrassment.

OK benji. You were on the right path afteral. Me, i have a lemon or at least some rough previous owner did things that were not a good idea.
The Connection in the pics above is for the ROAD SPEED SENSOR of which clearly is missing on my RR. Someone has put in a direct flexi-cable to the binnacle instruments in the dashboard from the transfercase and YES i have been having hell running issues. The most obvious being slowing down and coming to a stop and then needing to select reverse. The engine always idled too high so i'd basically smashed it into reverse!!! (Poor trans).

So what to do?... the RSS is missing as far as i can tell and after much messing around found a YELLOW wire to the ECU pin 6 (moving vehicle sense) cut and disconnected...

DANG this is not a good look. My options to sort it are to buy an expensive AMR3386 and expensive new speedo cables or to make some kid of gadget that pulses that pin 6 on the ECU in relation to if the vehicle is moving or not (has anyone done this)?.. My heads in a bit of swim now working through my options...

Previous bad work by others on any kind of car is just the lousey trick of all deals i guess, but yuh live and learn.