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Are you expecting the light "to get brighter"? Because that is not how a tail/stop lamp works. You should have two positive cables (and one ground). The first will be connected to the side light feed and will drive the standard brightness LEDs, as a tail lamp. The second will be connected to the brake light feed and will turn on the higher brightness LEDs as a brake light.
I used a Landrover replacement dual brightness LED tail/stop lamp unit which is a straight swap for the Cobra high level brake light. As I only needed the bright brake light, I didn't connect the standard brightness cable. But it was easy enough to check the function of the two separate circuits to determine which was which.
Nigel [/quote]
There are two positive leads, both connected to the existing Mog lights. I'm not expecting the LEDs to get brighter and assume that there are two rows of LEDs but I can't see if there are through the red lens when it's unlit. I need to get SWMBO or someone to depress the brake pedal whilst I look at the light (because I'm too lazy to uninstall it to test it). I'm not too unhappy at the moment because it works really well as a brake light, which was the purpose of fitting it.
