Installing AM/FM radio and speakers

[setty7]

It all depends on how you wire the switch.
To charge either battery, the motor has to be running.
If the switch is set for BOTH and the motor is running BOTH batteries receive charge.
You can wire the switch so that either battery will crank and run the motor(RECOMMENDED)
You can then use the 1---2---or---BOTH---positions to maintain batteries.

thanks man, the wiring diagram to me seems a little complicated. Do you run one? If so was it hard to wire up?