LED Adaptor Module

[Gravy]

I own a Linear Electronic Design LED Adaptor module which is configured for use with a Discovery 3. Is there differences in the trailer light functions between a Discovery 3 and 4 making this unit incompatible with my 2014 L319?

Did both models have trailer connection recognition which initiated sway control and transmission ratio changes?

[Tombie]

It’s different.

You can make one cheap and sell the one you have.

[Gravy]

It’s different.

You can make one cheap and sell the one you have.

Thankyou you have confirmed information I had been told. Do you have a circuit diagram to facilitate making your own? I prefer not to fit dummy load resistors.

[josh.huber]

Thankyou you have confirmed information I had been told. Do you have a circuit diagram to facilitate making your own? I prefer not to fit dummy load resistors.

Hey gravy,
you'll need to fit dummy load resistors or light bulbs. Most of us in here have dummy resistors fitted to a switch in the rear compartment. I simply open the till box and flick a switch when I hook up. I'll see if I can find the thread on the subject. The secret of using resistors it to let them hang in the breeze and don't tie them to your wiring. That way they don't melt anything.

[josh.huber]

Discovery 4 LED trailer lights
Discovery 4 LED trailer lights

[Tankmat]

Thankyou you have confirmed information I had been told. Do you have a circuit diagram to facilitate making your own? I prefer not to fit dummy load resistors.

There’s a circuit diagram here, post #18

LED trailers
LED trailers

[Gravy]

There’s a circuit diagram here, post #18

LED trailers
LED trailers

This issue on the Discovery 4 is not as complex as I first assumed. My experience with my Volvo XC60 made me believe the installing dummy load resistors would not resolve the problem.

The Disco 4 obviously possess some enhancements that connection of a trailer with LEDS does not cause blown globe diagnostics and reversing sensors to malfunction.

Dummy load resistors do have some disadvantages in that large amounts of energy have to be dissipated when they are energised. Having to only install them in the indicator circuits is a bonus because energisation times are short, however should you have to activate your Hazard Lights for an extended period there could be a problem if the resistors are not installed on a heat sink.

I am still of two minds the Linear Electronics Design module to address the issue is expensive compared to fitting dummy load resistors.

If my brain was sharper I am sure an electronic circuit could be devised to mimic this function, I thought a D4 owner may have already done this.

Appreciate your advice.

[kelvo]

I am still of two minds the Linear Electronics Design module to address the issue is expensive compared to fitting dummy load resistors.

Appreciate your advice.

Three guess what’s inside a Linear Electronics Design module…

[Gravy]

Three guess what’s inside a Linear Electronics Design module…

Have you dismantled one? Tomorrow I will do so as I want to establish whether I can convert the D3 module for use with the D4.

[kelvo]

Have you dismantled one? Tomorrow I will do so as I want to establish whether I can convert the D3 module for use with the D4.

No I haven’t.
But I’ll guess the D3 module has two relays and two load resistors in it.
The D3 module will also work on a D4.
I will also guess that if the D3 & D4 modules cost the same they will be the same, if the D4 is cheaper then it will only have two load resistors.

The benefit of the L.E.D. module is it’s all mounted in an aluminium box (Heatsink).

I was able to get a suitable finned aluminium heatsink to mount my two load resistors on and then have a switch to enable or disable LED trailer towing.