when you bought the harnes you should have received a confirmation email with the link on what you need to do
it is plug and play
but the fan requires their (RC) adapter to mate to the stock harness due tio a different connector on the fan , that connector in my opinion is inadequate and using the adapter would still leave the fan connector , hey after all its its a 79.00 fan so you cant expect the world)
to use the RTX fan hotwire harness you need to cut off the connector on the ramchargers fan and solder on the supplied connector as per the directions on the link provided
BTW this harness end also mates up with the stock harness incase you ever need to bypss the hotwire if a relay ever goes bad (you may never have to but its nice to know if your on the road you can fix it just by unplugging the fan and replugging to the stock connector ) .
heres the info i got after purchase before it arrived
jack may have changed something but im sure he will chime in
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Cut off the Valeo 4-position fan connector leaving as much wire as possible.
Trim back the black covering on the black/yellow/green wires by 2.5"
Place the green wire through one blue seal supplied.
Place the yellow wire through one blue seal supplied.
Place the two black wires through one blue seal supplied.
Strip the ends of the green, yellow and two black wires by 3/16".
Using a pair of 'B' crimpers or fine tip pliers crimp the wires onto the supplied terminals as shown.
Using a pair of round crimpers or fine tip pliers crimp the back terminal ears around the blue seals as shown.
Solder the terminals as shown. Do no get solder anywhere other than on the crimp area as shown.
Apply some supplied silicone grease to the seals and inlets of the wires to help seal and insertion.
Insert the black wire(s) into channel 'C' of the supplied connector.
Insert the green wire into channel 'B' of the supplied connector.
Insert the yellow wire into channel 'C' of the supplied connector.
Insert the TPA / black terminal lock on the backside of the connector
The yellow and green wires can be reversed as it is a combination of both having power that provides high fan function.
Pictures for review:
http://www.racetronix.com/Manuals/RX-G7-DFH/