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BMW E39 M-Tech Tourer Tow Bar Wiring

Hi,
Whilst I have been able to fit my tow bar on my 2001 E39 M-Tech Sports Tourer, I am unsure how to wire up the standard 12N socket. What wire colour does what? What side do I pick up the wiring loom? My car also has parking sensors.
Your help on this is appreciated.
Mark

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5 Suggested Answers

3bachelors
  • 52 Answers

SOURCE: Tow bar wiring

use the wires inside the hatch behind the plastic panel on either side. Wiring for your car is as follows - 












Parking Lights YELLOW (-) 1K OHM RESISTOR AT THE STEERING COLUM HARNESS USE A 1KOHM RESISTOR Brake Lights WHITE/TAN (+) AT SWITCH Reverse Lights VIOLET/BLACK (+) 72 PIN CONN POS 6 BEHIND PASS KICK







Good Luck, NGK

Posted on Sep 04, 2008

tommyboinow
  • 324 Answers

SOURCE: Volvo V70 2001.. Plugs For Towbar Electric's??

No those plugs are stricktly for double towing with a tow bar only, you will have to install a second single tow plug.

Posted on Nov 26, 2008

  • 188 Answers

SOURCE: tow bar wiring

Go to U-haul, and they have a kit to make it easy to fix your problem.

Posted on Jan 31, 2009

johncaman
  • 201 Answers

SOURCE: tow bar wiring

You need a Trailer Light Power Module - Uhaul, or anywhere that sells hitches and accessories. The module will power the lights directly from the battery - it still hooks into your car's lighting system, but only for sensing purposes, it doesn't put an extra load on the lighting system.

Here's an example from Uhaul:

http://store.uhaul.com/Wiring__lights/Moving/Trailer_Light_Power_Module

Hope this helps :)

Posted on Mar 08, 2009

  • 65 Answers

SOURCE: Fitting a towbar for a caravan with 13pin europlug

black socket, black 7 core wire
pin 1 yellow left indicator
pin 2 blue, rear fog light
pin 3 white earth
pin 4 green right indicator
pin 5 brown right side/tail light
pin 6 red brake lights
pin 7 black left side/tail light

Grey socket grey 7 core wiring
pin 1 yellow, reverse
pin 2 blue, supplementary feed (ignition)
pin 3 white, earth
pin 4 green live feed (battery +)
pin 5 brown not connected
pin 6 red supplementary feed (ignition)
Pin 7 black earth

On the discovery there is a purpose made plug behind the panel on the drivers side rear, behind the rear lamp
i think the relay you have bought is for lamp failure you just need a normal 4 pin 30 amp relay.
Good luck Davelee

Posted on Mar 24, 2009

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Need the wiring diagram for the aux circuit feeding caravan fridge power while the engine is running.


Understanding Caravan and Tow CarUnderstanding Caravan and Tow CarIn the beginning.... The first and oldest electrical system on caravans, that was installed way back when most caravan's were no more than small garden sheds on wheels were the rear lights that replicated the rear lights of the towing vehicle, usually no more than two side lights and two brake lights.
Illumination for inside the caravan was provided by gas lights fed from a small gas cylinder usually clamped to the "A" frame of the caravan. It wasn't long before the lighting system needed to be upgraded, as direction indicators became mandatory on cars, additional wiring was needed to replicate indicators on the rear of the caravan. Skip forward a few years and a rear fog light became mandatory, so a further upgrade was made to the lighting electrical system to allow the rear fog light to be installed. The wiring for these lights was connected through a 7 pin plug to the car that is commonly known as a "12N" connection.Sometime in between the indicators and rear fog light changes, people decided they wanted to replace the gas lights inside the caravan with 12 volt lights that could be run from the car battery. People often used old car spotlights or other 12 volt lights that were found in cars of the time as interior lights and these soon drained the car battery, so an "upgrade" was to install a second battery in the caravan that could be used to provide power for lighting. These were usually old car batteries. It would be another few years before the dedicated "leisure battery" came along. Originally, you would have to take this battery out of the caravan and charge it at home using a standard car battery charger. Again, in a continual developing process, someone came up with the idea of being able to charge the second battery in the caravan from the tow car while driving along the road, or when on site, being able to run the engine of the car and using a long lead be able to plug the caravan into the car to charge the battery for the next nights use of the lights, So a second "supplemental" electrical system was born and the "12S" (S for supplemental as to differentiate it from the 12N or Normal) connection came into being.he 12 Volt systems
The 12 volt systems are split into two. The first, and as we have seen, the oldest is the caravan road lights, that is to say the lights that are required by law to have on all trailers. These lights consist of "tail" or "rear" lights - rear side lights (red), brake lights (red), direction indicator lights (orange), reversing lights (white) and fog lights (red). Due to the size of a caravan front marker lights (white) are required and from 2013 side marker lights (orange) on longer caravans.
12N & 12S Vehicle Wiring
These lights are connected to the car via a 7 pin "12N" type plug or by a more modern "continental" style 13 pin plug. The road lights are usually a complete system with all the supply and earth connections being separate from any other electrical system on the caravan. One of the most common faults with road lights is problems associated with the earth lead, but more of that later.
The only road lights that are not connected via the 12N connection are the caravan's reversing lights. The original 7 pin socket when it was developed was thought to have enough connections for everything anyone could ever want. Unfortunately as the years progressed, the number of "spare" connection on this plug diminished, to the point where there was no spare connection for the reversing lights. However, with the advent of the 12S, this was taken care of.The second 12 volt system is the supplemental system. This is designed so that when towing, you can charge the caravan's leisure battery, power the fridge and in some cases power an electrical brake system. The design of the supplemental system has to take into account a number of things:-
• It must be able to charge the caravan's leisure battery only when the car battery is fully charged and the engine is running.
• It must be able to power the caravan's fridge - but not allow the fridge to flatten the car battery if the engine is not running.
• It must be able to power the internal 12 volt electrical system of the caravan, but turn everything off when the engine is running.
• It must not interfere with the correct operation of the road lights of the caravan or towing vehicle.
OK, so lets look at the first one -
"It must be able to charge the caravan's leisure battery only when the car battery is fully charged and the engine is running"roblems with this type of connection. If the car battery is flat and you try to start the car, a heavy current will be drawn from the caravan's leisure battery and would cause the caravan wiring to over heat and possibly cause a fire. It would also damage the plug and socket connecting the caravan's wiring to the car, as they are not designed to take the high currents involved in starting a car engine. So how can we do this safely?

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http://www.chuckschevytruckpages.com/trailerlights.html

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Saves having to use a supplementary socket
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