Compression Ignition Addict
Join Date: Dec 2007
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I don't see the relay in this diagram but, here's what the typical 5-pins are for...
You have 2 connections (85 & 86) for the coil that, when energized, produce a magnetic field and cause the relay to "trip" and flow current through two other connections (30 & 87). The fifth connector (87a) is what the supply (30) is connected to when the coil is not energized.
So, you connect the power you want to send somewhere to the #30 and it goes to two possible places;
#87a (Normally Closed) and connected to #30 when shut-down
#87 (Normally Open) and connected to #30 when current is flowing through #85 & #86
Then, what it is that relays are for, you either Send or Interrupt the flow of a larger amount of current by using a very small amount of current through the electromagnet coil that physically Moves a switch inside.
#85 (Coil) can be either Ground (-) or Batt (+) ( just so it's the opposite of what you're doing at #86)
#86 (Coil) same thing, the "Ignition Key" or "Trigger" or "Whatever" it is that's supposed to control the relay and supplies the path of electricity to flow through that coil.
The coil wires have to @12v but the other three are just a switch and can handle whatever the contacts are rated for...
Last edited by NoRalPh; 11-07-2012 at 01:06 PM.