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Hello! Yes you need to hook up 12v power to program the microcontroller unless you are using the stk500.
Purplish wire leading out goes to battery pack +. Blue resistor can handle huge energy surges. Left 2 posts of orange relay are the switch. One side of the switch connects to the precharge resistor. The other side of the switch connects to the capacitor bank +. The other side is the 12v control of the relay. Upper right post of relay goes to 12v battery ground. lower right post goes to the output of the leftmost (in the picture above) output of the PNP transistor (or p channel mosfet. I forgot). That transistor goes from 0v up to 12v when the microcontroller enables it. ya!
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