There is a connector from the light switch to the LED light unit which has 6 pins.
That's the important bit...
OK here is the thing.. The light (according to the add on timer) must be 3 channels Red, Blue, and white.
The switch part is ganged to turn on the white/red channel or the blue channel
So once the switch is removed and replaced by their timer you can control red,blue,white separately.
To do that there needs to be 3 wires (one for each color) and ground.
Having a plug w/ 6 is a bit confusing atm though in a sense not rr unusual if one thinks a "set" of wired per channel.
No idea why it would be needed. Just extra wires.
The S2pro is one channel and def doesn't have a 6 prong end.. .again as far as I can tell.
With the S2 in you still have the switches in line too? Correct?
Only way I see that you can just plug it in.
So "ideally" one would figure out which wires go to which channel and polarity they have..
Usually the "common" wire to all three channels in these types of lights is the DC positive.
Kind of opposite of what most think "ground" is.
Yea without venturing into some electronics it would be difficult to replace their timer w/ some aftermarket stuff.
This diagram is how to run multiple single channel lights off a TC-420. Each light is a channel.
In your case each channel would be a color.
Power supply that you have would be wired to the TC . There is a plug on the tc that 'may" fit the one from your power supply.
Been awhile since I've used one so not sure if you can power the channels from the plug or not.
I'm pretty sure I hardwired to the "in" screws on the adapter, like my diagram.
I didn't use ch 1
anyways note (+) is common and one would hook the light common there.
Each channel is the negative side.
I know a bit confusing in the beginning..
Anyways you'd need a matching 6 prong plug w wires to wire to the tc 420.. or cut the plug off the light and rewire from there.
Of course prior to that one needs to determine which wires carry what which would be found by stripping back some of the jacket of the wire harness.
So lot of destruction w/ that method. Alternate would be to disassemble the light head (shouldn't be too hard) and see the wiring from that end.
Mot circuit borads mark what they are and where they go.