Alex,
The Bosch 5 pin relay I used was one that I had kicking around in my goody box, probably bought many years ago. I'm sure that Lordco, Napa etc. still carry them. Open the fuse box in the drivers side engine bay. Locate the headlight relay and the 7.5 amp charging fuse. When you flip the Bosch relay over you see the 5 pins. #85 runs to the switched side of the charging fuse, the left side of the 7.5 amp fuse. I cut the wire, yellow with a blue stripe, and used heat shrink to splice them back together, with the jumper to the Bosch relay included. Pin #87 on the Bosch relay needs a jumper to the #1 pole on the headlight relay in the fusebox, this pin is the one closest to the fender and the driver. The wire I tapped into was red with a white stripe. Poles #30 and 86 on the Bosch relay run to ground, which is a short jumper to the mounting bolt. The middle pole also #87 is not used. I mounted the relay just aft of the fusebox on the fender where there is a handy 6mm bolt. Elegant? Maybe not, but effective nonetheless. My truck is a 96, so the colour of the wires may not match but the fuse box should be the same. HTH, Greg.