Turn your keyboard CAPS lock off please. You are yelling, lol.
What I did is this:
0) Removed the radiator and placed it front-down on my workbench....
1) After marking one wire of the two wire lead with white marker on both sides of my proposed cut, I cut the wire from the fan that connects to the frame side harness (it has a connector on the end) off about 3 inches from the back of the fan, and stripped all 4 cut wires (2 connector side, 2 fan side). Note I still know how to reconnect these because I marked one of the wires with white marker (tank marker, like writing on acetylene or CO2 tank).
2) Assuming the secondary fan is already installed just not wired....
3) Pull the secondary fan lead wire over to the primary fan to gauge the length, and cut it leaving enough to length to strip both leads. Then it gets tricky. I figured out which lead on the primary would turn the blade the correct direction (it pulls air through the radiator, towards the header) using a regulated 12V power supply, and put red tape on the found (+) lead. There are other ways, and the fan you buy may put a stripe on one wire to denote (+) or (-), so read the instructions first, carefully.
4) I spliced (+) and (-) from secondary to (+) and (-) on the primary, (+) to (+), (-) to (-) but did not solder yet.
5) Slipped shrink tube onto the connector lead, pushed it all the way to to the connector, and then I spliced the connector lead back on the combined leads, (+) (marked) to (+) marked, (-) to (-) and did not solder.
6) Hooked the power supply up again, and made sure both fans turned the right direction and the same direction.
7) Soldered the two connections, pushed the shrink tube over them, hit it with the heat gun, and wrapped it all with electrical tape for good measure.
8) Reinstalled the radiator, and plugged the fans into the OEM wiring harness connector.
Mine has run flawlessly now for several seasons. They both come on at the same time, and go off shortly after.
Living the Gypsy Life