2R 2C ECU Confusion
 

2R 2C Confusion http://imgur.com/gallery/xMWHc

I'm in the middle of adding grounds to my 87 NA FC and having a bit of confusion.

Based on the diagram, the middle connector should have 2R 2C as grounds (black wires), but upon inspection, I saw 2C is brown and 2D is the black one.

normally I would just trust the diagram and ignore the colors, but here's where I got confused...

higher up, where the ground wires meet up into 1 wire, all of them are black. Looks like 2R and 2D. I vaguely remember reading that some 87 models had a brown Ground? But wouldn't this mean that i should see brown and black up top joining up?

I'll be grounding tomorrow night so any help would be appreciated. Otherwise, I'll just ground from the wires that meet up.

thanks!!