I did experience "fickle" electrical connections before I cleaned everything. If it wasn't working, I would get out and tighten one of the small nuts (which hold the wires on). Often it would work after that.

So if time allows, maybe clean (steel wool? sand paper?) the connectors to see if that eliminates any fickleness. But if it is working and continues to work, maybe it is best to leave well enough alone. I find that sometimes I create more problems than I solve when I tackle non-essential repairs.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).