Brian - I got a whole separate post for your lights wiring info.
You're exactly right about the wire connectors allowing for removal of the rear fender assembly, but in the front it's the lower grill housing and there is also a connector at the upper grill housing. Maybe Kraig, Oh Great One Keeper of the Photos, has some pics where you can see the lighting harness connectors and actual wires. They are not just spade connectors, they are automotive type with a sort of push and snap together connection.
ALSO, you need to have a good hard look at your existing wiring harness. I seem to recall that the original harness came with at least part of the lighting wires. IH used these nice slide on connectors that would hold the wires right up against the underside of the upper frame channels. Have a look from the rear of your tractor right down the underside of the upper frame channel to see if you can see any wires already in place. You should see your battery wires routed there and you might see a wire connector looped over, which would be the single hot wire used for the rear lights. For the front, IH ran the harness down along the under side of the dash pedestal, and routed it under the upper frame channel and towards the front for the engine. If you follow this harness to the front you may just find a wire connector looped in a holder on the under side of the upper frame channel, roughly in the area between where the 1st bolt hole is that holds the lower grill housing to the frame, and approx the area even with one of the starter mounting bolts (it's hard to describe this area of the frame channel). You'll have to look really hard since IH had a good install method, and as I recall they had these clip connectors tack welded to the frame that hold the harness really close and tight to the underside of the frame.
I wish you good luck with your wiring. It's easy to do an installation that works and has all the wires exposed but that’s prone to problems. You really don’t want to hear this but if you have to install a complete harness all the way from the switch, it’s a whole lot easier to install the harness correctly when the engine is removed. Without the engine removed, even if you get the original harness wires it's hard to the point of a big pain to get it installed the same as the factory method, which is really the best to avoid problems. And when you do the rear wires IH did route the wire to each light thru a little gap where the vertical fender stiffener meet the horizontal tire cover part of the fender. They had these neat little clips that slip onto the metal and hold the wire nice and snug against the insides of the fenders. That way the wires don't droop and get caught by a tire or tire chain, and don't droop and look unsightly. I don't recall exactly how the rear lighting wire harness is set up but seem to recall it's a single wire running on the underside of the frame channel to the area just past the rear part of the battery box, then the harness has a nice Y splitter into 2 wires, 1 to each side. IH used those nice little clips I mentioned to hold the wires nice and snug up against the inside of the fenders.
Sure hope Kraig can come up with some pics. If you could look at someone elses Quiet Line with lights it would be worth about 1,000 pics.
(by the way, I see Charlie has the Y'd pigtail harness for the rear lights which must be the same for the 1x8/9 and Quiet Line. He only shows the front light harness directly at the lights themselves and shows it's for the 1x8/9 but I believe it's really the same for the Quiet Line. If you have the lighting wires in your original harness you will still need a wire with the correct connectors that runs from the frame up to the upper grill).
(Under Edit - Jeremiah you're up late
