Full Size Jeep Network

I have had this '72 Commando for a long time, but have never seen these identified in a book/TSM. What the the heck are they and what do they do?
The silver thing on the right looks like a breaker....? The hockey puck on the left, no clue.
They are on the drivers side, up above the emergency break.

circuit breaker

Not factory. Something the previous owner added. The breaker-thing is indeed a circuit breaker. Trace the wires.