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Originally Posted by Jamie (Astronouth7303)
Is the fourth wire (orange) related to timing? or is it another power source?
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It's another a battery power lead.
Black = Ground
Red = +Battery (not required for Victors)
Yellow = PWM Control (1-2 ms positive going PWM signal)
Orange = +Battery
See page 8 of the the "2004 EDU Robot Controller Reference Guide" for a pictorial of the pinout.
I simply assume the orange lead is most likely a higher current capacity "Raw Motor Power" lead for the servo (vs a low current "Logic Power" wire or PCB trace that may or may not be regulated), but I haven't broken any seals nor set up any voltage and current inline tests yet to confirm that.
- Keith