Hi Bunny/Andy

Isn't the black box the TSM/Lighting Control control unit - the one that Alastair is looking to improve/replace?

I think the relay is the one added that controls the cooling fan.

Regards
Andrew

Currently
2011 M3W
986 3.2S
Z4 M40i
Cectek Estoc
Midget 1275
1959 Frogeye Sprite
2022 Defender 90 HT