No Hidden Master Switch...
...on a stock Mac 26 D.My first guess would be a bad battery terminal connection. Second guess is a bad battery.Ramblin' Rod's Electrical Circuit Trouble Shooting Sequence1. First measure the voltage across the battery terminals. Should be close to twelve volts.2. a) If not, measure across battery posts for 12 volts. If so, remove terminals, clean posts, retighten. Should be good to go. If not, recharge battery or replace if necessary. 2 b) If so, measure for 12 volts across device switch contacts (while rocking switch on and off).3 a) If not (in either postion), trace wires from battery to switch for open connection.3 b) If so, measure for 12 volts across switched device. 4. a) If not, trace wires between switch and device for open connection.4 b) If so, fix or replace inoperative device.