Discovery 3 LED trailer lights

**shack** · 2nd February 2022, 03:00 PM

Originally Posted by 101RRS

I cannot speak to the D4 but with ignition on there is pulsed power going through both indicator cables on the D3/RRS - hence the pulsing. Barely visible on the trailer LEDs in daylight and just visible at night but the pulse is there. With a pulse buster box fitted this pulsing does heat the resistors to a high temp.

Thanks! That saved me typing it!

**Tombie** · 8th February 2022, 11:28 AM

That’s odd.

My control boxes the relay takes the pulse, so the resistors never see that energy when indicators aren’t on.

My units won’t get warm if left connected with the vehicle sitting there indicators off.

**BradC** · 8th February 2022, 11:56 AM

Originally Posted by Tombie

My control boxes the relay takes the pulse, so the resistors never see that energy when indicators aren’t on.

How does that work? Do you have the resistors on the LED side of the relay contact?

If that's correct that would mean the vehicle only needs the resistance in the relay coil to "detect a trailer" and the resistor sizes could be either drastically reduced or removed altogether.

**shack** · 8th February 2022, 01:15 PM

Originally Posted by Tombie

That’s odd.

My control boxes the relay takes the pulse, so the resistors never see that energy when indicators aren’t on.

My units won’t get warm if left connected with the vehicle sitting there indicators off.

My boxes were about 400 projects ago, can't remember how I wired it, I'll have a look when I get 5..

**Stuart02** · 18th February 2022, 04:23 PM

The folks at Stockman installed a Whitevision trailer trigger but it didn't work...

**loanrangie** · 11th April 2022, 10:47 AM

Ok so now that i've bought a van and it has led lights i need to fastrack building a pulse buster, think i have my shopping listed sorted.
I will be adding a switch but haven't seen a diagram as to how to wire it ? I will be cutting my trailer wiring and placing this inline since i am adding led's to my box trailer.

2 x load resitors
2 x relays 40a or will 30a be ok ?
aluminium box
wire - i have
connectors - i have

**Tombie** · 11th April 2022, 02:51 PM

Add:

Thermal epoxy - Jaycar etc - to bond the resistors to the housing as a heat sink.

You can solder or use connector blocks inside the box - up to you.

Isolation switch DPST

I have a diagram sitting here somewhere.

**loanrangie** · 11th April 2022, 03:20 PM

Originally Posted by Tombie

Add:

Thermal epoxy - Jaycar etc - to bond the resistors to the housing as a heat sink.

You can solder or use connector blocks inside the box - up to you.

Isolation switch DPST

I have a diagram sitting here somewhere.

Is there too much load for a single pole switch ?, i need to make it remote.

**Bulletman** · 11th April 2022, 09:14 PM

This is the set up I have used 3 times and works well
20220328_121745.jpg

Bulletman

**loanrangie** · 11th April 2022, 09:26 PM

Originally Posted by Bulletman

This is the set up I have used 3 times and works well
20220328_121745.jpg

Bulletman

If adding a switch would i put it between the resistor and the earth ?

Thread: Discovery 3 LED trailer lights

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