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Old 02-03-2013, 08:03 PM
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Let me add to the above post......

If you are using a 5 terminal relay, instead of a 4 terminal, to switch something on for example..... fog lights....

I like to hook the hot lead to terminal 87 (NO) and the fog light feed to the common terminal (30). My reasoning.... When the relay is not energized, terminal 87a (NC) is dead.

If pwr were on terminal 30 and the light feed was on 87, then when the relay was not energized terminal 87a would be hot and increase the chances of a short circuit.
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