I have found the pump but it is real hard to see the wires connected to it to trace it back to any plug. I did find a connection plug that is located between the battery and the monovalve. It hangs in a metal "sling bracket" with Barbs. It is Rectangle shaped with a brown and a black wire to and from.
The plug is dark brown or black.

I want to disconnect it for now and install a 1A fuse in it once I get the fuse holder and fuse.

I don't want a fire.

Is this the plug?

Thanks in advance.

Steve

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1982 300SD