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UK Caravanning (uk.rec.caravanning) A forum for the discussion of caravanning undertaken by residents of the United Kingdom, whether in the UK or abroad. It encourages the interchange of views on the merits of models of caravan, makes of tow car, accessories, caravan sites, caravan clubs, and other related topics. The term caravan is to include trailer vans, motor caravans and trailer tents.

Electrical problem



 
 
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Old October 12th 03, 07:54 PM posted to uk.rec.caravanning
Alan Lipscombe
external usenet poster
 
Posts: 2
Default Electrical problem

Hi,

Own a Sterling Eccles Sapphire 2002 model. No problems with electrics
until t his weekend. Noticed that the side lights dimmed when the break
used on the car. When I checked the raer the break lights were not
coming on at all. When I checked the grey plug and socket I noticed alot
of melted plastic aroung the centre plug/socket on the van and the car.
This does not look good. Any suggestions?


--
Posted via Mailgate.ORG Server - http://www.Mailgate.ORG
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  #2 (permalink)  
Old October 12th 03, 08:17 PM posted to uk.rec.caravanning
Tony Maris
external usenet poster
 
Posts: 161
Default Electrical problem

Hello Alan,

The sidelights and brake lights are on the 12N black socket so, if your car
is wired correctly, the melted 12S socket is an unrelated problem.

The fault on the 12N is likely to be the connections made on the car's
towbar wiring or a bad earth (again on the car). What vehicle do you have?

The 12S problem is one that I've done a lot of research into. This only
occurs on caravans wired to the newer wiring spec (1998 onwards). The
problem is the centre pin of the 12S plug collapsing and causing high
resistance in the interface. You obviously need to replace plug and socket
but this will happen again unless you do something about it. I have written
an article (with a cure) which can be seen at
http://www.towitall.co.uk/faq/information.htm but as there seem to be many
newer subscribers on here recently, I have also copied it here. For the
alteration to be effective, it is essential that the brown wire in the 12S
cable is earthed to the vehicle body.

Hope it helps.

Regards

--
Tony M
Towbars & Trailers
Chesterfield
Specialists in Towing Equipment
NTTA Council Member
http://www.towitall.co.uk
QSA accredited for Towbars and Trailers

__________________________________________________ _________________
12S PIN BURN OUT. IS THERE A CURE?

I believe there is.

What Is The Problem?

Up to October 1997 and the introduction of new wiring standards for caravans
and leisure vehicles, all the 12S system (with the exception of pin 1,
yellow, reverse) relied on one heavy wire (pin 3, white) for the earth
return. Pins 5 (brown) and 7 (black) were unused. Since EN1648-1, the
central pin 7 (black) has been allocated as the refrigerator earth return
and pin 2 (blue) is now redundant (previously battery charging circuit).
These changes roughly coincide with the introduction of new larger
fridge/freezers which, naturally, draw more current.

Pin 7 is an extended male segmented pin in the plug and acts as the 'lead'
to guide the plug into the socket. As such, it is the one pin most likely
to suffer damage in use. This, coupled with the higher current draw and the
smaller cross sectional area of the wire is causing voltage drop, higher
resistance, heat build up and consequently, melting plugs and/or sockets.

And The Answer?

You could change your double socket system on car and caravan to one of
three continental 13 pin plug systems (either Jaeger or Feder/West
Multicon). This, however, would entail changing other caravans and trailers
that you may want to tow (though the Feder/West Multicon sockets will accept
a standard 12N plug in the centre), and would prove expensive.

Alternatively, you could do a minor modification to the caravan 12S plug
wiring. As pin 5 is unused, it is possible to link pin 7 to pin 5 and
(provided the brown wire is earthed in the towing vehicle) share the load
between both. Additionally, as pin 2 is now unused (though still probably
connected to the split charge relay) the same can be done with the feed by
linking pin 6 to pin 2.

The advantages are obvious. The combination of 2 cores gives a greater CSA
than called for in the legislation and the load (feed and return) is shared
by 4 pins instead of two. There will be less voltage drop, less resistance
and less heat build up. It is a relatively simple DIY alteration and is
inexpensive.

I would recommend using 28/0.30 (17.5 amp) cable for the linking wires.


Tony Maris
Towbars & Trailers

Chesterfield

28/08/2001

The writer has been Proprietor of Towbars & Trailers (Chesterfield) for over
20 years and lectures on Towbar Installations and Trailer Maintenance to
members of the industry. He is a Council Member of the NTTA, is a founder
member of the 'Quality Secured' working group and is currently chair of the
NTTA's I.T. working group. His company was the first in the UK to be
accredited to the NTTA's 'Quality Secured' standard. Additionally, he was
the founding Treasurer of the re-formed Chesterfield and District Small
Business Club and is a D.O.T. and RYA certified Yachtmaster (Offshore).



Supplementary to the above, tests performed by students on the last 3 NTTA
courses have produced an improvement in the voltage drop to the fridge of
1.1 volts when using the two links as described. Towbars & Trailers as a
company have been earthing the brown wire (pin 5) on all our towbar fittings
since late 2001 and implementing the alteration to our customers caravans at
their request. There has not been a single repeat instance of pin burn at
this time (5/1/2003).




__________________________________________________ ______________

"Alan Lipscombe" wrote in message
news:[email protected] .mailgate.org...
Hi,

Own a Sterling Eccles Sapphire 2002 model. No problems with electrics
until t his weekend. Noticed that the side lights dimmed when the break
used on the car. When I checked the raer the break lights were not
coming on at all. When I checked the grey plug and socket I noticed alot
of melted plastic aroung the centre plug/socket on the van and the car.
This does not look good. Any suggestions?


--
Posted via Mailgate.ORG Server - http://www.Mailgate.ORG



 



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