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check the voltage at the power switch after it goes through the switch to the main radio board.put the ground on the neg lead coming into the radio or at a neg location on the main board. do not put the ground on the metal case of the radio.

you should have 13.8 volts into the radio and the same at the power switch. one side of the switch is straight from the power plug. so put your test lead on the side feeding into the radio on the switch.