enodreven Posted November 19, 2011 Share Posted November 19, 2011 Hi, Can anyone help please, I have just connected my "A" frame to the car and Motor-home and the indicators won't work, I tried just connecting the towing board to the plug on the motor-home tow-bar and the running lights work together with the brake lights, but the indicators both left and right don't work, they do on the motor-home . I don't know if its relevant but I also don't get the louder indicator noise in the cab, its a 7 pin plug, any advice or suggestions would be very welcome. The wiring on the car is completely separate when thy fitted the "A" frame they ran a cable fixed to the underside of the car with separate plugs at either end so I have to connect the tow-board to a plug in the boot and the "A" frame to a separate plug under the bonnet and the other end to the motor-home tow-bar. As I mentioned above I have connected the Tow-Board direct to the Motor-Home tow-bar plug so I think that should rule out any problems with the tow-car ? Thanks Brian Link to comment Share on other sites More sharing options...
lennyhb Posted November 19, 2011 Share Posted November 19, 2011 If would help if you let us know what the Motorhome is. Link to comment Share on other sites More sharing options...
Guest JudgeMental Posted November 19, 2011 Share Posted November 19, 2011 if its a fiat did they know what they where doing when they fitted plug? *-) Fiat can bus system needs a relay OR expensive Fiat wiring thingamajig,,,,, Link to comment Share on other sites More sharing options...
enodreven Posted November 19, 2011 Author Share Posted November 19, 2011 Hi its a Fiat Ducato 2.8JTD 2004/5 Bessacarr E735 the tow-bar was fitted from new and everything has worked perfectly until yesterday Thanks Link to comment Share on other sites More sharing options...
Rayjsj Posted November 19, 2011 Share Posted November 19, 2011 You need to 'test' your plug in the Motorhome First . Do you have a digital Volt meter ? or any kind of 12v tester ? This is the wiring diagram, the top one is the one you use. http://www.dquirk.com/images/PDFs/12volt_trailer1_wiring.pdf If you don't understand it, and have no test equipment (as above) you need to see a professional. Ray from your description it sounds like you have a bad earth connection,but without testing it ? Link to comment Share on other sites More sharing options...
Clive Posted November 19, 2011 Share Posted November 19, 2011 You may have two slave relays for the trailer indicators and these have lost a supply perhaps. You need a sparkies brain and a multimeter. The connections for the standard 7 pin socker are :- ISO 1724N Pin Code Duty Current (amps) estimate Colour 1 (L) Left hand indicator 2 amps yellow 2 (54G) Rear Fog lights via switch on dash. 8 amps blue 3 (31) Chassis return 18 amps white 4 ® Right hand indicator 2 amps green 5 (58R) Right hand Tail lights 1 amp brown 6 (54) Stop lights 4 amps red 7 (58L) Left hand Tail lights 1 amp black The connection for the extra 7 pin connector for caravans is :- CONNECTIONS FOR 7 PIN 12 VOLT TRAILER AUX SOCKET ISO 1724S PIN CODE COLOUR DUTY 1 (L) YE Reversing lights 2 (54G) BU Caravan batty charge supply (only when engine running) 3 (31) WH Chassis return for pins 2 & 6 4 ( R ) GN Interior lights, water pump etc Permanent supply 5 (58R) BN Unused 6 (54) RD Fridge supply (only when engine running) 7 (58L) Unused. If you have the European 13 pin connector then the pin out is :- EUROPEAN TRAILER CONNECTOR. An “all in one” connector that serves the job of both our “N” and “S” connectors. ISO 11446 EN 1648-1 DIN 72570 Pin 1 Left hand direction indicator Pin 2 Rear fog light Pin 3 Common return for pins 1,2 & 4 to 8 Pin 4 Right hand direction indicator Pin 5 Right tail lamp, side lamp & number plate lamp Pin 6 Stop lamps before Pin 7 Left tail lamp, side lamp & number plate lamp Pin 8 Reversing light Pin 9 Continuous power supply Pin10 Power supply controlled by ignition switch for charging caravan battery. Pin 11 Return for cable number 10. (Not Allocated before Oct 98) Pin 12 Coding for coupled trailer. Linked to pin 3 in plug. (Not Allocated before Oct 98) Pin 13 Return for pin 9 ( Return for pins 9 - 12 before Oct 98) Information source dated October 1998 Hope that helps a bit. Good luck C. Link to comment Share on other sites More sharing options...
enodreven Posted November 19, 2011 Author Share Posted November 19, 2011 Hi. everyone thanks for the links and the information I have a multi meter and will check it out tomorrow and update you on how I get on thanks everyone Brian Link to comment Share on other sites More sharing options...
Brian Kirby Posted November 19, 2011 Share Posted November 19, 2011 But, before it gets too complicated, have you inspected the connections on the 7 pin towboard plug? Also, silly as it may seem, have you inspected the lamps, and their connections, inside the towboard indicators? Final thought: is the socket on the van of 7 pin, or 13 pin, variety? I seem to remember reading a while back that there had been some change to the wiring of the 15 pin sockets and that, consequently, the wiring of 7 pin plugs, where these were being used, would need to be changed. You may find this link instructive: http://www.caravanclub.co.uk/media/1022790/towbar-wiring-mo.pdf, as Ray's sheet is from 2005, and a lot changed in 2008. Link to comment Share on other sites More sharing options...
Clive Posted November 19, 2011 Share Posted November 19, 2011 I am afraid to point out that Rays sheet is wrong regarding the split charge relay. If it is wired as shown the main split charge fuse will blow when the engine is cranked because the ignition switch will be turned On and the relay will be energised. Consequently the leisure battery will try and contribute towards the engine starting current. The positive coil supply for the split charge relay must come from the alternator D+ terminal because this is not positive until the engine is running and the alternator is charging. C. Link to comment Share on other sites More sharing options...
Rayjsj Posted November 20, 2011 Share Posted November 20, 2011 Thanks Clive, I'm afraid i just 'Cut and Pasted' it for the 7n plug wiring, I didn't check the Split relay bit. I'll shut the door on my way out . :$ Ray Link to comment Share on other sites More sharing options...
tonyishuk Posted November 21, 2011 Share Posted November 21, 2011 Best guess is that a supply fuse (or connection ?) has failed on the supply of electics to the indiactor circuits. ie the live feed that powers the trailer indicator lights, not the actual m/home lights which only activate the relay. You will have to follow the socket wiring back to the source, which may be mounted in the dashboard some where. Rgds Link to comment Share on other sites More sharing options...
Keithl Posted November 21, 2011 Share Posted November 21, 2011 Or you could just be very unlucky and both bulbs in your 'trailer' board have failed at the same time. Remember the old adage, always start with the basics, and in this case the bulbs are the first item I would check. Failing that I would go with Tony's comment above about looking for a fuse. Have you tried contacting whoever fitted the towbar (if you can still contact them) to ask if they know if a fuse is fitted? Keith. Link to comment Share on other sites More sharing options...
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