As Sixto said, your large round connector is not indexed correctly. Mine had a broken half moon index key, and allowed the connector to be installed in any position.

I've had one clocked incorrectly, and ended up frying the electrics on the 3 gage unit.

Check you wiring diagram, it will show you the color and number, and you can verify psoition.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles