Use a mechanical on/off switch that has a very positive, stiff mechanical operation, where switch slider ‘clicks’ solidly into place in both the ON and OFF positions. Avoid switches that have a ‘soft’ operation, where the slider is easy to move. Also, a switch that has a tall slider is much easier to operate than a switch with a short slider.

A 2-plug on/off switch is a very simple device. You connect one plug to the receiver battery, and the other end into the receiver. Turn the switch ‘ON’ to power the receiver; turn the switch ‘OFF’ to break the circuit.

However, to charge your receiver battery, you have to disconnect the battery from the switch, connect a charger to the battery, then charge. When you are finished charging, you have to disconnect the charger, then reconnect the receiver battery to the switch. If your wiring is all bundled up for protection, this may prove bothersome.

If you still want to use a simple on/off switch on your car, but want to be able to charge your receiver battery more easily, consider using a 3-plug/lead switch.