http://www.ado13.com/techs/relay.htm
is the relay wiring diagram for the high speed relay. I used a 75 amp relay from ebay.
http://www.ebay.com/itm/BOSCH-TYCO-R...-/290499370197
A on off on heavy duty switch and a 20 amp relay from a parts store for the low speed. Both are wired from a switched 12 volt source. The hot side of the relay came from a power block i had from my tbi wiring harness. Get one while you are at the pull and pay. They are on all of the 90's chevy trucks. It made it look alot cleaner when the wiring was finished. Plus gave me a few more hot spots for other stuff
Im not a great person with diagrams but there is only 4 wires to deal with per relay. I did have a buddy that helped and once we got started it wasn't bad to do