I have fitted a Bosal tow bar and dedicated wiring loom to my C-Max however I am having problems getting the indicators (for the trailer) to work. There seems to be power going from the indicator wiring into Bosal module but nothing coming out or getting down to the 7-pin plug. The tail and brake lights are all working by the way. I suspect the problem could be something to do with the Orange wire on the Bosal loom which I have not used. The wire comes out of the module multiplug and splits into two spade connectors but I don't know what it is for or where it should go? The instructions show it being joined to wires from the cars own loom by cutting a plug off the end and connecting the wires to the Orange ones. The problem is I can't find this plug,it's not on the main cars loom where the pictures in the instructions suggest. Also the instructions are just pictorial and have no text at all which isn't very helpfull! Has anyone got any ideas please? Many thanks,Steve.
Bosal kits
claim to be plug and play to your vehicle
no wires meant to be cut
the wiring instructions might be generic and not truly specific to your C-Max
save time
wire in indicators old school
pick up the left and right indicator wires at the back of the car
make sure there is a good earth on the 7 pin plug
SOURCE: Tow bar trailer socket wiring connection point to car wiring?
The connectors for towing wire harnesses on foresters are generally on the passenger side, below the rear taillight inside the cargo space. some require pulling up the foam block that is between the spare tire compartment and the taillight. Check where you replace the tailights from inside the car, if there isn't a matching connector hanging out there, check around the spare tire compartment, see if you can remove the carpeted foam block next to the compartment and find the plug under there.
SOURCE: Need to solve towbar wiring fault for trailer
This sounds a bit crazy, but you do not have a good solid ground to your trailer brake lights. You may have to run a separate ground wire from the trailer to the car. Pull your trailer close to the front of your car, close to the battery. Use some wire to connect your trailer to the battery. Then touch each contact one at the time until you learn which port turns on which light(s). Using the wires, only one in the ground connector and the other in the brake connector. gain access to one or both sides of the trailer lights, use another wire and touch the base of the bulbs to the metal of the trailer if the light gets brighter you need to run another ground wire. Hope this helps FixYa up.
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