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Might be a bad connection at the plug housing check your terminals on the MINI wire harness , moisture gets in there and can cause on low voltage issue. Also make sure the bulbs are all the way in the socket on the taillight, they might just need a quick turn, from the factory the tabs can be bent in a little more then they should to make contact. Need anything else shoot me a PM.
then yes, I second the tips by ECS. I bought my sypder euro tail lights for my r53 from M7 a few months ago. I self installed and did have a similar issue. Just make sure you are inputting the correct light bulbs in the correct spot. The brake lights/parking lights also double as a reverse light if I'm correct, just can't think off the top of my head which one as I'm sitting here on the PC. You will know which one is which because when you visually inspect the filaments of the bulb one set has two filaments inside as opposed to one. That's going to be your reverse light as well.
Not quite!
I can only speak for the '02 Cooper S, but there are 3 bulbs in the tail lights, the reverse light is separate, above the exhaust tips.
The top bulb is a brake light only - an 1156 21W bulb.
The middle bulb is the yellow directional - an 1156A 21W bulb.
The bottom bulb is a combined stop-tail bulb - an 1157 21/6W bulb.
Edited to add: The ECS units quoted seem to have a red directional at the top, a white backup light in the middle & a combined stop/tail light at the bottom - I don't see how they'd work correctly, at least on a US spec '02 without some wiring changes. ECS, please correct me!
The top light in the 2002-7/2004 is the rear fog light. Middle is turn, and bottom is stop light / parking light. Unless someone has tapped into the factory wire harness and made the top light also a stop light. Becuse most people dont have the rear fog toggle in the 2002-7/2004 , also not activated. The double brake light mod on the 2002-7/2004 is common.
Thanks for the correction!
I have an early 2002 Cooper S with NO options, like rear fogs. All four brake lights work! I'll check, but when I changed the bulbs I don't recall seeing any jumpers or paper clips - I believe this is how it came from the factory.
I do like the idea of the rear fog light switch panel kit referred to in one of your links. I wonder if it would work correctly with what I have?