Anybody have that? In the old days, I would get some help with wiring diagrams from the Haynes manuals - apparently they didn't think there was enough DIY interest in the W126 to justify creating one.

Somewhere I have in my stuff a Haynes manual that covered the OM603 in the W124 not sure if it would have what I'm looking for.

I'm trying to connect an aftermarket keyless locking system to my '86 300SDL. It's hard slogging.

Their instructions tell me to find the NO, NC, and common leads. Five wires come back to the pump, a hot, a ground, and three wires in a bundle: blue, yellow and green. A second bundle of blue, yellow and green also are involved, I don't quite get it.

My understanding of a normally closed (NC) circuit is one with 12 volts while the system is at rest. I connected a wire to a jumper cable going to the negative battery terminal, sliced a little bit of the insulation off the blue, yellow and green wires, and each one of them reads battery voltage. Wouldn't a NO (normally open) lead show 0 V when touched to ground? And I'm not real sure what the definition of a common lead is. I've read a few things about it, but I'm still in the dark.

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Te futueo et caballum tuum

1986 300SDL, 362K
1984 300D, 138K