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13 Pin Trailer Socket  Rate Topic 
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 Posted: Tue Apr 2nd, 2019 09:05 am
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Mack
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Mana: 
The vehicle I was having the issues with was the X Trail. I got rid of that and now have the Volvo XC60. Out of interest I tried the Sealey box on it and ALL the LEDs lit up! Next MOT is definitely going to be at the Main Dealers!

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 Posted: Tue Apr 2nd, 2019 08:23 am
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Clifford Pope
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Mana: 
Mack wrote: I am still confused as to how his rig could differentiate between High and Low level lights when all the stop lights on the caravan are powered from Pin 6 on the socket.

I can see how it might detect that a light had failed, even though there were two others on the same circuit. Volvos have had devices that warn the driver if a brake light has failed for over 30 years - it just measures the lower current drawn by one fewer lamps.
Presumably this tester is a more sophisticated version. The Volvo one can be confused by mismatch between bulbs of different manufacture, or I have found by a bulb that is approaching failure.
But like you I cannot see how it can distinguish left from right,or centre.

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 Posted: Tue Mar 19th, 2019 06:13 pm
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Mack
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Mana: 
Thanks for this Paul, well done Sherlock!

Fortunately I was able to get the tester to plug my box in and see the result. He did then pass my car, so I now have a current MOT cert, so don't need to appeal.  I had already decided that next year I was going to make sure I had the test done by the Main Dealer I usually use, as they had no problem with the socket last year.

However, the episode has motivated me to bring forward my plans to change the vehicle, and I have now traded the X Trail in for a Volvo CX60 (which has a factory fitted tow bar and electrics, which hopefully won't be a problem in the future).

I am left rather confused as to how the kit you show above, and which is still used widely, can apparently differentiate between high level and low level stop lights on the caravan when they are all powered by pin 6 and also that 2 different pieces of VOSA approved kit appear to give 2 different results, one passing the socket and the other failing it.

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 Posted: Tue Mar 19th, 2019 05:42 pm
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Paul S
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Mana: 
Mack you can appeal the mot result.. https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/780586/complain-about-an-mot.pdf

please let us know the outcome

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 Posted: Tue Mar 19th, 2019 05:18 pm
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Paul S
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Mana: 
VOSA Approved MOT Socket Tester from MOT Supplies (Butts of Bawtry)..guess thats either the JHM Butt MOTST01 EINTE15160A0511029-- or
JHM Butt MOTST02 EINTE15160A0714033-- on the obsolete equipment listed by dvsa
https://www.gea.co.uk/wp-content/uploads/2018/12/13-Pin-Tester-List-31.5.18.pdf

JHM Butt are marketing the Sealey TST22 test box now..

you could point this out to the test station in question, if in doubt pass & advise

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 Posted: Tue Mar 19th, 2019 04:52 pm
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Mack
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Mana: 
Paul S wrote: like this?Yes, I think that might be it.

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 Posted: Tue Mar 19th, 2019 04:44 pm
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Paul S
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Mana: 
like this?

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 Posted: Tue Mar 19th, 2019 04:33 pm
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Mack
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Mana: 
From memory, his was about the same size as the Sealey and had the outline of the back of a caravan in an orange colour.

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 Posted: Tue Mar 19th, 2019 04:25 pm
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Paul S
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above Ten TST 100 is on the current 13 PIN TOWBAR ELECTRICS TESTER – ACCEPTED UNITS list.. but aint seen one that includes upper brake light

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 Posted: Tue Mar 19th, 2019 03:43 pm
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castrolrob
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Mana: 
Paul S wrote:
interested to know the make & model of the trailer socket tester he was using, which had 3 LEDs for the stop lightsditto,weve got 2 different makes here neither of which differentiate between upper/lower/left/right.just one led that says brake.strange?

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 Posted: Tue Mar 19th, 2019 03:09 pm
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Mack
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Mana: 
Paul S wrote: also confused any chance you can get a photo of their Vosa approved rig?Probably not. I have never used this place before, and don't know the tester that well. It's a large chain, and if he's correct in that they all use this type of kit, then there may be others who know what it is.

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 Posted: Tue Mar 19th, 2019 02:51 pm
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Paul S
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Mana: 
also confused any chance you can get a photo of their Vosa approved rig?

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 Posted: Tue Mar 19th, 2019 01:54 pm
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Mack
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Mana: 
I am still confused as to how his rig could differentiate between High and Low level lights when all the stop lights on the caravan are powered from Pin 6 on the socket.

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 Posted: Tue Mar 19th, 2019 01:01 pm
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Paul S
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Mana: 
https://www.gea.co.uk/wp-content/uploads/2018/12/13-Pin-Tester-List-31.5.18.pdf
got a Crypton CTT01 kinda like your Sealey TST22, aint seen one with 3 LEDs for the stop lights.. probably just me
:shock:

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 Posted: Tue Mar 19th, 2019 12:49 pm
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Mack
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Paul S wrote: interested to know the make & model of the trailer socket tester he was using, which had 3 LEDs for the stop lightsHi Paul. I did ask before buying my Sealey as I thought there would be no point in buying the same model if it would only show the same result. He showed me it and it had no branding that I could see, just the Vosa approved Logo. He said that it was supplied by their Head Office, so all their garages use the same model.

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 Posted: Tue Mar 19th, 2019 12:37 pm
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Paul S
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Mana: 
interested to know the make & model of the trailer socket tester he was using, which had 3 LEDs for the stop lights

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 Posted: Mon Mar 18th, 2019 09:56 am
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Mack
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Stealth wrote: Hi Mack & welcome to the forum.

There is a known problem with some 13 pin socket test equipment. This is covered in the latest Special Notice issued by DVSA.

https://www.gov.uk/government/publications/mot-special-notice-01-19-towbar-electrical-socket-test-tools-diesel-smoke-meters-and-annual-training-and-assessments/mot-special-notice-01-19-towbar-electrical-socket-test-tools-diesel-smoke-meters-and-annual-training-and-assessments

It may be worth calling back & asking your tester to read the notice.ThanThank you Stealth. I have been reading up on this issue, and lurking on this site gathering information. I was aware of the recent Special Notice and mentioned it to my tester. However, he did not think that this isue was related to the CANBus issues mentioned elsewhere as on his test box the LED's were not flickering.

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 Posted: Mon Mar 18th, 2019 09:13 am
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Stealth
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Mana: 
Hi Mack & welcome to the forum.

There is a known problem with some 13 pin socket test equipment. This is covered in the latest Special Notice issued by DVSA.

https://www.gov.uk/government/publications/mot-special-notice-01-19-towbar-electrical-socket-test-tools-diesel-smoke-meters-and-annual-training-and-assessments/mot-special-notice-01-19-towbar-electrical-socket-test-tools-diesel-smoke-meters-and-annual-training-and-assessments

It may be worth calling back & asking your tester to read the notice.

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 Posted: Sun Mar 17th, 2019 03:38 pm
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Mack
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Mana: 
Apologies in advance for what is going to be a long post. I want to be as clear as I can in setting out the background to my question.
Last January I had a 13 pin socket fitted to my Nissan XTrail as we had just bought a caravan. The socket was fitted by a specialist motor electrician. In March the car had its usual Main Dealer service and was MOT’d at the same time. It sailed through the MOT with no advisories. During the course of the year we toured with the caravan and the correct operation of all the lights was checked before each journey.

Fast forward to this year and the car was due its annual service, but I wasn’t able to book the MOT with them and had to arrange it elsewhere for the following day. When I went to collect the car I was surprised to be told that it had failed, the reason given was “Trailer electrical socket (13 pin) not operating the trailer lamps as intended (Stop lights inoperative) [4.10 (c) (i)]”

Now, I know that the stop lights on the caravan operate when connected to my car, but I accept that my word on this would not be enough, so I bought a Sealey TST22 test box (which is VOSA approved). This showed me that the stop lights are working.
I booked the car in for a retest and mentioned to the tester that my own observations and my (VOSA approved) test box showed that the stop lights were working. He showed me the test box he was using, which had 3 LEDs for the stop lights; 2 at low level, and 1 at high level. For my car, the high level LED was lighting up but not the bottom 2. He regarded this as a fail. He did agree to plug in my box, which only has 1 LED for the stop lights, and the LED lit up when the brake pedal was depressed.
As far as I am aware, pin 6 on the 13 pin socket is the one which controls the stop lights, so I am not how his test kit could isolate high and low level stop lights. I am also confused that 2 different pieces of VOSA approved kit appear to give 2 different results.

Any thoughts and guidance would be appreciated. My initial thoughts are to make sure I go back to the Main Dealer for next year’s MOT, as they have previously had no issue with this socket.

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