I just installed one myself on the same year bike, and had the same issue- no headlight. They run the wires a little differently than the OEM harness.
http://forums.sohc4.net/index.php?topic=31306.0In the Honda harness, the brown/white stripe (power feed for the lighting) going from the key switch has a brown wire with a red stripe branching off of it (headlight power) going to the headlight fuse. This wire comes back to the headlight bucket where it connects to the right-hand control pod to the headlight on/off switch. From here it goes to the other side pod and the Hi/Lo slelector and finally to the headlight in either the white (lo) or blue (hi) wires.
The PartsN'More harness does it a bit differently. There is still the brown/red stripe wire running from the fuse panel to the headlight bucket, but instead of connecting the other side of the fuse directly into the headlight power circuit, they instead have
both wires from the headlight fuse go up to the headlight bucket and terminate with female bullet connectors. There is also one extra brown/white stripe wire with a single female bullet connector, that the OE harness doesn't have.
To correct this, use a meter to find which brown/red stripe wire in the headlight bucket connects to the left side fuse terminal. Connect this to the male brown/red stripe wire bullet connector going to the handlebar pod. Now, connect the meter to ground and the other lead to the extra brown/white stripe wire. It should read battery voltage when you turn on the key. The other brown/red stripe wire now needs to be connected to this extra brown/white stripe wire in the bucket. I made a short jumper with two male bullet connectors and connected them together, or you can solder them, as Honda did inside the harness. Now the headlight should function as intended.
The white wire goes to the pigtail harness on the headlight connector. Are you sure you're not looking at the gray wire for the turn signal flasher connection? It's a very light gray in the new harness. (Just a thought.)
Hope this helps, good luck!