trailer brake controler

**amtravic1** · 28th January 2008, 06:02 PM

Could some one tell me whether this is ok, I suspect not.
I was fitting a new trailer plug to the rangie today and tested all the connections when I had finished with a multi meter.
When I tested the trailer brake terminal it has about 7.3 volts when the brakes are not applied rising to 12 volts or so when the brake is fully on. The readings where taken with the engine off.
I would have thought there would be no voltage at all when the trailer brake controller was not working (brakes applied)
The power for the controller goes from the battery to a circuit breaker then to the controller then there is a wire from the brake light switch which goes to the controller however as the ignition is off there should be no power there.
I suspect the brake contoller faulty.

thanks,
Ian

**LandyAndy** · 28th January 2008, 06:44 PM

Hi Ian
Which breed/model???
If its the same as mine I can check the manual.
Mine is the Teknosha Prodigy.Still in its box.
Andrew

**amtravic1** · 28th January 2008, 07:31 PM

Thanks Andrew,
mine is a Kelsey and around 10 years old. It does not have any model number that I can see. I may call into a trailer supplier tomorrow and ask them.

Ian

**Blknight.aus** · 28th January 2008, 07:34 PM

Check what setting you have it on...

most have an adjustable screw that sets how hard the brakes come on If thats wound up to the max setting some of them will have the brakes dragging.

I'd have thought that by now that would have all been sorted so that they were on or off as needed.

**amtravic1** · 28th January 2008, 07:38 PM

I adjusted the knob on the side which adjusts how hard the brakes come on. Made no difference. There was voltage at the trailer plug (around 7,3 volts) no matter where the adjustment knob was.

Ian

**harlie** · 29th January 2008, 07:46 AM

Same as mine, but I think its around 5V (been a while since I checked) – it’s to do with the way some controllers check the brake circuits and it will be a higher voltage if there is an open circuit (ie no trailer). My unit does this for about two minutes during this time the dig display flashes OC - and then it switches itself off if nothing is detected.
As a side note it’s this function that makes some units incompatible with the marine electric over hydraulic systems.

**fraser130** · 29th January 2008, 08:26 AM

I would at a guess imagine the voltage you are getting will be exactly as harlie has said. You'll probably find this voltage will be of very low current (thus no braking effort on brakes) and if you plug in the trailer it will drop to almost zero.
Cheers,
Fraser

**amtravic1** · 29th January 2008, 04:48 PM

Thanks Harlie and Fraser.
I asked at a trailer manafacturer today and they said it sounded normal.

Ian

porgey · 12th March 2008, 06:41 PM

I am installing a Prodigy on a 1999 D2 TD5 .via the prodigy generic wiring diagram I have to connect the red wire from the controller to the cold voltage wire could someone tell me which colour wire on the brake switch is the cold side and can it be installed with or without a diode I am a retired mechanic but my specialty was not LRDs Thanks George

RonMcGr · 12th March 2008, 06:57 PM

Originally Posted by porgey

I am installing a Prodigy on a 1999 series 2 TD5 .via the prodigy Generic wiring Diagram I have to connect the red wire from the controller to the cold voltage could someone tell me which colour wire on the brake switch is the cold side and can it be installed with or without a diode I am a retired mechanic but my specialty was not LRDs Thanks George

Hi George,

How is the Disco going ?

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