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Discussion Starter · #1 ·
Hi

I've recently purchased a second hand 2019 Cross with a towbar, today I hooked it up and noticed the lights are not working on the trailer.

Does anyone know where the fuse might be, if there is one dedicated to towbars?

Thanks
Ivan
 

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I have the Mitsubishi towbar and harness on my EC but not had any issues. From previous installs on Mitsubishi cars I've done myself there is a control unit which hides in the rear of the car (right side rear on previous cars) that connects the electrics to the CAN bus for signals for lighting. There was separate power loom which would connect to the battery and a ground to earth. Those power looms had an inline fuse to prevent shorts causing too much damage.

Have you checked the female plug on the car to see if there are any issues there? Also check the male pins on your towed end to see that all the pins are OK. Has the towed item's lights worked on another vehicle? Round or flat connector? In Australia we have a 7 pin flat connector which is favoured for trailers etc. The UK may be different. You can open up the connector on the towed end as well to see that all wires are securely connected in the male plug. Ensure the earth wire is good as it will take out all the lights at once.

Failing the basic checks, follow the wiring loom from the female plug on the body to where it goes into the cabin and then start by removing the trim inside the vehicle in the area above to see where it connects to the car harness. Typically, for me, it was over the right rear wheel well. If the trailer harness has a separate power loom it may connect to the positive terminal on the battery.

The positive terminal has a multi connect strip on the terminal at the back towards the engine where accessories can be connected without bulking out the battery terminal itself. Flip up the protective red cover (it can take a bit of force to open) and have a look around and see if there is any connectors on here. Follow each as far as you can to see if it has an inline fuse. If so, check any or all to see if they are blown. Your last resort in an auto electrician who can run a multi meter over the pins of the female plug to ensure power is getting there or check your local dealer service centre.
 

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Checking the lighting circuit diagram you will be looking for a 10 pin connector (D-15) or a 4 pin round (A-114) (inside the cabin) as noted on the pic below depending on what part is included in the factory wiring loom. You may find a switch box along the length of the cable also:

1368
 

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Discussion Starter · #4 ·
I have the Mitsubishi towbar and harness on my EC but not had any issues. From previous installs on Mitsubishi cars I've done myself there is a control unit which hides in the rear of the car (right side rear on previous cars) that connects the electrics to the CAN bus for signals for lighting. There was separate power loom which would connect to the battery and a ground to earth. Those power looms had an inline fuse to prevent shorts causing too much damage.

Have you checked the female plug on the car to see if there are any issues there? Also check the male pins on your towed end to see that all the pins are OK. Has the towed item's lights worked on another vehicle? Round or flat connector? In Australia we have a 7 pin flat connector which is favoured for trailers etc. The UK may be different. You can open up the connector on the towed end as well to see that all wires are securely connected in the male plug. Ensure the earth wire is good as it will take out all the lights at once.

Failing the basic checks, follow the wiring loom from the female plug on the body to where it goes into the cabin and then start by removing the trim inside the vehicle in the area above to see where it connects to the car harness. Typically, for me, it was over the right rear wheel well. If the trailer harness has a separate power loom it may connect to the positive terminal on the battery.

The positive terminal has a multi connect strip on the terminal at the back towards the engine where accessories can be connected without bulking out the battery terminal itself. Flip up the protective red cover (it can take a bit of force to open) and have a look around and see if there is any connectors on here. Follow each as far as you can to see if it has an inline fuse. If so, check any or all to see if they are blown. Your last resort in an auto electrician who can run a multi meter over the pins of the female plug to ensure power is getting there or check your local dealer service centre.
I have the Mitsubishi towbar and harness on my EC but not had any issues. From previous installs on Mitsubishi cars I've done myself there is a control unit which hides in the rear of the car (right side rear on previous cars) that connects the electrics to the CAN bus for signals for lighting. There was separate power loom which would connect to the battery and a ground to earth. Those power looms had an inline fuse to prevent shorts causing too much damage.

Have you checked the female plug on the car to see if there are any issues there? Also check the male pins on your towed end to see that all the pins are OK. Has the towed item's lights worked on another vehicle? Round or flat connector? In Australia we have a 7 pin flat connector which is favoured for trailers etc. The UK may be different. You can open up the connector on the towed end as well to see that all wires are securely connected in the male plug. Ensure the earth wire is good as it will take out all the lights at once.

Failing the basic checks, follow the wiring loom from the female plug on the body to where it goes into the cabin and then start by removing the trim inside the vehicle in the area above to see where it connects to the car harness. Typically, for me, it was over the right rear wheel well. If the trailer harness has a separate power loom it may connect to the positive terminal on the battery.

The positive terminal has a multi connect strip on the terminal at the back towards the engine where accessories can be connected without bulking out the battery terminal itself. Flip up the protective red cover (it can take a bit of force to open) and have a look around and see if there is any connectors on here. Follow each as far as you can to see if it has an inline fuse. If so, check any or all to see if they are blown. Your last resort in an auto electrician who can run a multi meter over the pins of the female plug to ensure power is getting there or check your local dealer service centre.
Thank you for the detailed reply. I'm not sure if it worked before but the connectors externally visually appear in practically new condition.
I'll take a look closer, perhaps open things up and see what I can.
 

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The battery may have a single red wire running from it to a fuse holder. This is the power for the towbar wiring.

Which lights are not working?
 

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Discussion Starter · #6 ·
Checking the lighting circuit diagram you will be looking for a 10 pin connector (D-15) or a 4 pin round (A-114) (inside the cabin) as noted on the pic below depending on what part is included in the factory wiring loom. You may find a switch box along the length of the cable also:

View attachment 1368
Thank you for this, will take a look
The battery may have a single red wire running from it to a fuse holder. This is the power for the towbar wiring.

Which lights are not working?
None of the lights work on the trailer, not indicators, breaks or running lights
 
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