The Mysterious Backside of a Becker (86 300E w124)

[gleep]

So my becker, being quite broken, is going to be replaced. The wire harness kit I got from crutchfield is making most of the process easy, even for a neophyte like myself. I've run into a few mysteries, however.



Above is the backside of the mysterious becker.

A) Unknown [Edit: Antenna]
B) const power/memory [12v+]
C) light? [illumination 12v+]
D) power [ignition 12v+]
E) ground
F) Unknown [Edit: Alarm wire, don't try to hook up to new head unit ]
G) Left front, left rear speaker
H) right front, right rear speaker



Here's a closeup of the plug for mystery F. The wire has a sleave on it, so I'm not sure if that's one wire with a stripe or two wires that are really, really friendly. In either case, I've no clue what's going on with that plug.



And now we have the fun stuff.

I assume B) and C) go to the front speakers, I'm not sure since if I apply a battery there's no result. (The two sets of wires not shown go to the back speakers and I got sound out of them fine from the head unit when I plugged it in for a bit; these are the sets that were plugged into G and H on the first pic). I believe that A and D have something to do with the fader. [edit: note, the black plugs and white plugs were originally connected]

What I think crutchfield's harness kit is doing, is turning the left speaker connection (G on the first pick) into left rear +/-, and right speaker connection (H) into right rear +/-, thus bypassing the fader. [Edit: Nope, the wire harness kit didn't bypass the fader switch.]

A) and F) from the first pic probably have something to do with the speed volume adjustment and power antenna, but I'm not sure which is which. [Edit: see above]

When it comes to the mystery wires on the third pic, I'd really like to know which is doing what. I'm contemplating turning the fader knob into an AUX input (my head unit has two). [Edit: still contemplating this]

Any help greatly appreciated,

--gleep