Trailer electrics (1 Viewer)

May 23, 2008
2,480
3,481
Near Durham City
Funster No
2,787
MH
Carthago
Exp
Since 1984
Thought I'd check our knowledgeable community first. My car trailer has developed a problem whilst we are now in the Scottish Highlands. My Indicators are working fine but no stop/tail lights.
I've checked all the obvious places but nothing.
Any ideas please??
 
Dec 24, 2014
9,034
46,438
Hurstpierpoint. Mid Sussex.
Funster No
34,553
MH
Compass Navigator
Exp
Ever since lighting was by Calor gas.
To save lengthy 'try this, try that' replies and you've already done it, what do you mean by 'obvious places'?
Bulbs?
Holders?
Earths?
Checked socket/plug with a test meter?
 

Badknee

LIFE MEMBER
Aug 25, 2014
7,395
408,985
notloB
Funster No
33,046
MH
Vantage Neo
Exp
Living the dream.
If you have a good earth on your indicators there must be multiple faults. Brake lights. Left side lights. Right side lights.
If it was me I’d check the earth first to make sure.

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PeteH

Free Member
Nov 22, 2007
6,853
9,029
East Riding of Yorkshire
Funster No
900
MH
Rapido, 999M.
Exp
18+yrs plus 25+Towing
I`d Go Earth`s First too. It`s the only common factor?. (Usually the white cable on a 7 pin setup)
 
Jan 8, 2013
8,478
11,516
Dronfield - Derbyshire
Funster No
24,202
MH
Burstner Lyseo 690G
Exp
Happy FLT since 2011
Do you have a CamBus wiring adaptor box? They can can fail pretty easily.

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The2i's

Free Member
Nov 7, 2016
56
58
Appleby, Cumbria.
Funster No
45,964
MH
Van conversion
Exp
Since 2016
If you've got a dedicated CAN wiring kit fitted, you'll probably find the fuses for the towbar electrics in the battery compartment (under the cab floor), it could be worth checking them first. If one has blown and only blows with the trailer on, there will be a fault on the trailer.
 
Jul 29, 2013
9,048
18,088
Salisbury
Funster No
27,215
MH
Hymer B678DL A class
Exp
since 2011
I had that problem whilst in Portugal and discovered that there were fuses in the towing loom control box and that was positioned on top of engine battery there were two fuses and one had blown I replaced it and Bobs your uncle no problems since, think it’s must have shorted when a bulb jumped out of its holder on their rough roads.😊
 

Bonkers the Dog

Free Member
Nov 9, 2018
372
944
Ayrshire
Funster No
57,155
MH
Pilote Explorateur
Exp
2 yrs
Yup fuse & earth check required.

Also clean it and get some contact cleaner/water repellent on it.

THey can be fickle all the same...

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Nov 7, 2015
496
466
Newport, Shropshire
Funster No
40,071
MH
Autosleeper Broadway
Exp
since 2015 previously caravaning 25 years
If possible I suggest you try and borrow a trailer board to confirm the socket on the van is working properly then at least you’ll know if the problem is with the trailer or the van.
If the towing socket on the van is working properly I’d be having a look at the connections inside the trailer plug next.
 
OP
OP
wiljoy
May 23, 2008
2,480
3,481
Near Durham City
Funster No
2,787
MH
Carthago
Exp
Since 1984
I assume its a trailer problem as the i indicators are working fine. Only issues are marker lights and stop/tail. Full check of advised cures today.
Many thanks everyone.
 
Mar 11, 2013
1,272
1,670
Gillingham
Funster No
25,056
MH
coachbuilt
Exp
since 2005
Ebay and Amazon sell a vehicle/trailer plug in light tester. With this you can isolate the problem. Handy to keep on board and just plug and play. They range from £7.00 to £12.00.

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Feb 6, 2014
170
329
Sussex
Funster No
29,997
MH
Hymer BC584 Classic
Exp
Since 2011
What motorhome do you have. do you know what company fitted the Towbar. Do you have LED side lights and brake lights on your vehicle
 
OP
OP
wiljoy
May 23, 2008
2,480
3,481
Near Durham City
Funster No
2,787
MH
Carthago
Exp
Since 1984
What motorhome do you have. do you know what company fitted the Towbar. Do you have LED side lights and brake lights on your vehicle
Its only the marker lights and stop and tail that are off. Indicators are fine. I'm now thinking it's the 5/13 pin adapter so going down that road but thanks.
 

cmcardle75

LIFE MEMBER
Jun 8, 2012
2,666
3,446
Reading
Funster No
21,386
MH
Riot Van Conversion
Exp
Since 2012
I assume its a trailer problem as the i indicators are working fine. Only issues are marker lights and stop/tail. Full check of advised cures today.
Many thanks everyone.

That tells you nothing about whether the problem is in the vehicle or the trailer.

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OP
OP
wiljoy
May 23, 2008
2,480
3,481
Near Durham City
Funster No
2,787
MH
Carthago
Exp
Since 1984
That tells you nothing about whether the problem is in the vehicle or the trailer.
I'm finding it difficult to pinpoint the problem as all my gear is at home and I'm in Grantown on Spey.
I've dismantled all the plugs on van + trailer, checked the earth so stuck. The wardens here are the not really approachable due to the covid.
 

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