The only wiring diagram I have seen is in the Paul Newett book.
On the wiring the one that rides down the LH rocker, or the actual 3 bulb assembly?
Assuming that latter as you note "on the units". I bought all my wiring for my EXP (similar setup) from Pete Disher in the last year or so:
http://www.thecoralsnake.com/
http://www.thecoralsnake.com/wiringlist
If you don't buy from Pete, be careful which one you buy, there is at least one after market style that will not work with OEM style taillight buckets. (ask me how I know!) :wink:
The Alloy Metal ones Pete sells have small circular press-on retainers to hold the bulb sockets, as the sockets don't quite press into housing as tight as OEM, and don't hold well. When you install them be very careful how the 4 small tabs on the retainer line up, as they can block the slots for the pins on the bulb and make it impossible to install the light (as above, ask me how I know!) . I found I had to use a small flat screwdriver to press them on really firm, as the first try resulted in the bulb sockets pushing back out when I went to install the bulbs...