OK, my brother got me this awesome little extech multimeter lead set, man that's handy. Clips on the leads kinda like in your picture. I clipped one lead to the relay, and went around poking with the other lead.

I got 0.3 ohms at the fuse labelled c, for the aux fans it said.
I got 0.4 ohms at the headlight switch terminal.
I got 0.4 ohms at a red wire on the terminal block with them disconnected.
I got 0.4 ohms at the battery positive with the terminal block connected.

That seems like reasonable figures to me.

I tried again with my test wire strung across the top of the engine, 12.4 key off, 10.7 key on glow active.

Without the test wire, 12.3 key off, 9.2 key on glow active.

Should I just make a permanent jumper wire?

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1982 300D (w123, "Grey Car")
1982 300D (w123, "Blue Car")
2001 Ford F150 "Clifford" (The Big Red Truck)
1997 Dodge Ram 2500 12V Cummins
1996 Dodge Ram 2500 12V Cummins
Previous Vehicles:
1995 E300D, 1980 300SD, 1992 Buick Century, 2005 Saturn Ion