Take a look at the diagrams below. They are typical 12 volt relays. The bottom 2 images might make it easier to see what happens. Pins 85 and 86 energize a coil. Pin 30 has fused 12 volt power, and Pin 87 has the load attached (in this case the fuel pump).
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Sunday, April 1st, 2012 AT 2:15 AM