Here are a couple of PRELIMINARY
wiring diagrams for the electric fan and relay conversions I'm working on now. Some changes are to be expected during installation as the kinks get worked out.
My intention is to put together a detailed writeup on my web site when the installations are finished. In the meantime, this information may be of some use to you now.
is the relay selected for my own use. Others will certainly work fine, although I think it is worthwhile to select one with a resistor across the coil or else add your own resistor. The relay is physically located under the seat.
The diode is a good idea but not essential. It will help prevent large voltage transients. Its part number is TBD.
The manual fan switch is located either on the handlebars or someplace on the fairing. It can be used to force the fan to come on. It may be eliminated if the lower temperature fan switches prove to work out well.
For the GL500, the fused switched accessory power feed is from the spare accessory power connector located under the seat. Not all GL500's have this connector, but my bike does. The frame ground connection point is the one located under the seat - another ring terminal is added here.
P1 and P5 are both located under the fuel tank, just in front of the carbs. P1 is the right side and P5 is on the left side.
Hope you find this preliminary information helpful.