I thought it is wired in serial as in cut one wire and slide it in?
No it's parallel. As noted, you may not need them at all.
If you do - here's what I did on my 900
-Went to radio shack and got the supplies to make some 2.5" wires that I could plug into the ends of the bikes harness on one site, and then plug the signal into on the other side. You'll need enough to make 4.
- Installed said 2.5" wires between the bikes harness and the rear signals, so everything can be tucked under the seat.
- Using crimp on taps, I tapped into the 2.5" sections making a parallel circuit with the signal
Uber simple ascii diagram:
|-LED-|
| |
|-Res-|
| |
^ ^
From the bike
THough you don't need to build those 2.5" bits - it means you won't damage the wiring by tapping into the bikes harness.