I have a PNP transistor and a 1N400X diode before the switches actually get the voltage from the battery (the PNP is connected to a battery monitor for low voltage cut off) There is also a diode from the 12V regulator that operates off of the AC wall voltage (to keep the battery from powering everything else in the circuit). I have also put a push button switch on the positive end of the battery so I can shut off all of the power to the circuit.
In the schematics I have posted the connectors that say optoCOMP# are all connected to the same photo-comparator that shuts off the LEDs if it gets too dark (additional battery saver), the connectors that say uC are where the micro-controller's input will go, each connector that says VU, Amp, FM, and Charger go to the respective portion of the circuit.
The first circuit is of the circuit before the TTL switches, the second circuit is all 4 circuits connected together, and the third circuit is just a single TTL switch.