Junction block eh?

Is this perhaps the one with 3 phillips screws? 2 big ones and one small one?
I removed the screws and cleaned it up, reassembled, tested again, I still get 9.3ish volts when glow plugs are energized at the relay, at that terminal block i get 10.9v

I tried swapping batteries just in case i had a weak cell or something.
No go there, same exact situation.

What I'm curious about is if the PO has hacked into the glow plug power wire for the fuse panel, or possibly the radio or something idiotic, as the fuse box on the drivers side also drops to 9.3v when glow plugs are energized.

Do you know if the wire that powers the relay is visible up under the dash anywhere?

I'm going to go run a heavy gauge jumper wire from the battery to the relay and see if i get voltage drop and hard start then (No, I'm not going to leave it like that, this car is for my wife, I'm not doing a hack job like that and leaving her stranded somewhere)

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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