Aftermarket led tail lights faulty?

[gfromleeds]

Morning guys so this weekend I fitted a pair of aftermarket tail lights to my 2009 w204 c220 and everything went well . Untill I started the engine.
The right hand tail light continually goes through its "boot up" sequence, but only the right hand and only when the engine is running.with the engine off, ignition on everything fine!
Anyone any ideas?
I would have thought if the light was faulty it would do it all the time, and if the bcm wasn't happy with it, both lights would do it, and or I'd get a dash warning?
Just want to be sure it's not something I've missed or done before I send them back. Cheers

 

[Rotorhead500]

It's normally down to the difference in resistance seen within the circuit.

Need to check that your aftermarket kit has balancing resistors built-in.

 

[gfromleeds]

It's normally down to the difference in resistance seen within the circuit.

Need to check that your aftermarket kit has balancing resistors built-in.

Yea there is and the left hand one not doing it
Think I'm going to try putting a bulb in the circuit see if that cures it. If it does I'll just get one of those canbus resistors

 

[gfromleeds]

So ive had a play about with the multimeter and found there's a little bit of resistance between the earth at the plug and the battery but really minimal so not sure if that's the issue.
I've also found that it's the car that's pulsing power to it so I'm a little relieved the lights arnt faulty (still not sure why there's no bulb out warning or why it continues pulsing it?)
Anyway I've temporarily run an earth directly from the battery to the plug, and in the 5 minutes I stood watching it, it started pouring down with rain, so I abandoned it lol.
But it so far didn't reset, but sometimes it doesn't do it! so I'm just gona keep an eye on it for now and look into it again at the weekend.
Fingers crossed