Because the switch has excessive carbon build up, or possibly corrosion on the internal contacts, which causes a voltage drop. Replace the switch.my remote switch and switch on motor have 12v going into switch and around 6v going out of switch on green and blue wires ,,why am i getting voltage drop in switch ??EVINRUDE 48SPL 1991,,thanks for any help
yea i was thinking about taking the switch apart,,,,,,the switch itself PN#0174285 is unobtanium...and i hate to buy a used handle just for the switch but B.O.A.TBecause the switch has excessive carbon build up, or possibly corrosion on the internal contacts, which causes a voltage drop. Replace the switch.