30 AMP Relay??? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 7 Old 12-26-2009, 11:20 PM Thread Starter
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30 AMP Relay???

So this might sound like a dumb question to some of you... but... on a 30 AMP relay... what does the 87A connection do, or what is it for?

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2014 JKU, Tera44, 4.56 gears, ARB lockers, RK 3.5" flex lift, ARB front & rear bumper, dual Viair 400C w/2 gallon tank, Zeon 10S, Nitto Tires, Genesis Dual battery kit, TeraFlex tie rod & flipped drag link, ARB Intensities and TeraFlex dual rate ST sway bar.
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post #2 of 7 Old 12-26-2009, 11:40 PM
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With auto style relays the 87a is a normally closed circuit. This means that the circuit will be complete until the relay is energized and that will turn off the circuit.

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post #3 of 7 Old 12-26-2009, 11:41 PM Thread Starter
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What would it be used for?

2014 JKU, Tera44, 4.56 gears, ARB lockers, RK 3.5" flex lift, ARB front & rear bumper, dual Viair 400C w/2 gallon tank, Zeon 10S, Nitto Tires, Genesis Dual battery kit, TeraFlex tie rod & flipped drag link, ARB Intensities and TeraFlex dual rate ST sway bar.
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post #4 of 7 Old 12-26-2009, 11:53 PM
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it lets you essentially wire a relay to work 'backwards'
so you can turn things off with it instead of on


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post #5 of 7 Old 12-26-2009, 11:56 PM
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As far as I know they are mostly used for alarms in that manner. I can probably think of something later though. Anything that you want to leave on and not worry about turning off unless something activates it. Could even be used for an air intake to close off if there is water present. The circuit will hold open a valve and when a switch senses water, it could open the circuit and the flap will shut. Like I said, just ideas.

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post #6 of 7 Old 12-27-2009, 09:33 AM
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think fuel pump with a safety trigger, or a nitrous solenoid when the fuel pressure drops too low the sending unit will signal the relay to open and shut off the nitrous so you don't melt pistons and so on.
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post #7 of 7 Old 12-27-2009, 10:33 AM Thread Starter
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Thanks everyone... just curious

2014 JKU, Tera44, 4.56 gears, ARB lockers, RK 3.5" flex lift, ARB front & rear bumper, dual Viair 400C w/2 gallon tank, Zeon 10S, Nitto Tires, Genesis Dual battery kit, TeraFlex tie rod & flipped drag link, ARB Intensities and TeraFlex dual rate ST sway bar.
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