Originally Posted by spartacus
Just changed my car so moved from 7 pin to euro 13 pin nonsense. Read on a few forums that CAN-bus LED lights may cause issues with car's onboard computer in as much as it doesn't recognise it. Not sure of the validity, but have stayed with old technology filament and used converter for light board connection.
Some vehicles will work, some won't. It depends on the vehicle, generally the higher end the vehicle ( I.e. Complexity of electrickery) the more the likelihood that it won't work. Disco, Range Rover, BMW need resistors. Some Volvos do, some don't. It's pot luck. You can buy a plug in box that goes between car & trailer to supposedly get around the issue, here again, they work on some cars & not on others. My all singing new trailer came with an interface box for the built in LEDs, it didn't work with the Disco4, I had to solder some £2 quid RS resistors into the indicator circuits. The actual trailer lights will still work without them, but you get a strobing flash on the trailer indicators about twice per second, also the vehicle doesn't "see" the trailer, so things like reversing sensors, stability programs, rear fog lights etc. dont get enabled/ disabled.
I actually prefer the 13pin euro plugs, they are better sealed & offer a more positive locking action compared to the old 7 pin type. I don't like adapters though, more joints & connections to go wrong.
Don't panic! don't panic!