Thread: CDL Electrics on Disco II for Diff-Lock Lamp

It's not the low/high range switch so the ECU knows which throttle map to use is it?

Hi/Low selector switch is on the top of the Front output housing, beside the Hi'Low selector lever, orientated horizontally and pointing toward the front of the vehicle.
The CDL switch is about half way down the Front output housing orientated vertically.
Even though my D2 came from the factory without any cdl internals at all, i found that the wiring loom still had all the connections required, complete with plugs.

The 03/04 TCs have 2 switches for the diff lock, wired in parallel. This causes the CDL light to be lit if the CDL is trying to lock or is locked. You will just need to add wires to parallel-up the 2 switches if you want to use them both.

I assume the voltages you are quoting are those from the workshop manual. The switches are definitely simple on/off type, its just that the instrument electronics consider voltages below the low voltage to be open-circuit and the higher voltage to be closed circuit.

Edit: In this instance, low voltage = at least 1 switch is closed, high voltage = neither switch is closed.

Originally Posted by PhillWilde

Hi/Low selector switch is on the top of the Front output housing, beside the Hi'Low selector lever, orientated horizontally and pointing toward the front of the vehicle.
The CDL switch is about half way down the Front output housing orientated vertically.
Even though my D2 came from the factory without any cdl internals at all, i found that the wiring loom still had all the connections required, complete with plugs.

The only free plugs in the loom routed next to the TCase illuminates the "Transmission High Temperature Warning Lamp" on the right side of the instrument cluster.

Could the required diff-lock wires and plugs be hidden in the loom from factory? It would be good to be able to use the correct wires so the TControl can be controlled when the CDL is engaged depending on engine state.

FYI: The switches show a closed circuit continuously when resistance is tested. Electronically, a low and high voltage can be considered on or off. If I cannot find the factory diff lock wires, rigging up a seperate warning light is not going to be easy.

I am watching this thread with real interest because I am keen to do a CDL (either with a D1 output housing or later case entirely) in my late 01 build series 2 V8....the question of whether the wires were there ready to activate the CDL lamp is a question that I have asked many people and so far noone knows for sure....if its not there I doubt I would bother with the conversion.

Cheers

I had a conversion done on my 2002 D2 and the difflock warning lamp wires were there.

JWB, can you supply more details please....

Is it an electric CDL actuator you had installed as opposed to the factory shifter?
Are you using the original diff-lock switch/s located on the top op the LT230SE TC?
With regard to the wires, did you find the wires yourself or did a Auto Electrician do it for you?
Were these wires hidden in the loom or located in a loom inside the centre console?

Cheers

Originally Posted by jmkoffice

The only free plugs in the loom routed next to the TCase illuminates the "Transmission High Temperature Warning Lamp" on the right side of the instrument cluster.

Could the required diff-lock wires and plugs be hidden in the loom from factory? It would be good to be able to use the correct wires so the TControl can be controlled when the CDL is engaged depending on engine state.

FYI: The switches show a closed circuit continuously when resistance is tested. Electronically, a low and high voltage can be considered on or off. If I cannot find the factory diff lock wires, rigging up a seperate warning light is not going to be easy.

The wires for the transmission temp light are on the LHS of the TC and there is a plug high up on that side that can be replaced with the temp switch that's used in V8s.
Maybe the wires for the diff lock, if they exist, are still above the gobx somewhere nearer the RHS.
If not then I'd expect the wiring loom inside the vehicle that runs under the centre console would be complete and just the extension wires from there have been omitted. You could remove the console and check for the presence of the correct colour wires.