I lifted this off the following link :
For less voltage drop, I'd suggest replacing the fuse on the power side of the relay with a fusible link.
- Michael2
Relay Wiring DiagramA relay is typically used to control a component that draws high amperage. The relay allows full power to the component without needing a switch that can carry the amps. The switch only controls the relay. The relay then provides a direct connection to the battery. It should be noted that either the power(86) or ground(85) in the relay control circuit can be switched. In the case of a horn, the horn button would be used to switch the ground lead(85) and power(86) would be provided directly from the fuse box.This is a typical wiring diagram for a standard relay installed for
headlights, horn, fuel pump, electric fan, etc. If the relay has a
5th terminal, it is not used.



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to direct you to a couple of threads in the projects area ... 





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