I installed a multi wire boat trailer tail light plug about 2 feet from the sender so that I could take it off the boat for cleaning. I learned the hard way that the tiny little wires will not stand much twisting and bending for cleaning it on the boat. The plug makes for a quick and easy disconnect. Once off the boat I hose it down and then place it in a bucket where the rods get brushed with Muriatic acid. If I notice two lights staying on at the same time between major cleanings, a sharp tap on the top of the unit will get it working again. If not, out it comes. RC