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Old 05-21-2013, 12:06 PM
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Default Quick relay power question

I have a digital read-out cap, 2 amps, and 4 led fans. Will one spdt relay be able to turn all of that on? and for the fusing for the equipment, is there a way to tell the turn on voltage for the amps? the fans are 2.4V each, so a 10 A fuse will work for them, but the manuals don't say for the amps...
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Old 05-21-2013, 01:39 PM
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A typical Bosch-style relay is capable of 30 amps, which is way, way more than you would ever need for what you are planning.

All voltage on the relay circuit will be 12v (or 14.4, or whatever your cars electrical system is at the time). If those fans operate off of 2.4v max, they will burn up with 12v.

Fuse size should ALWAYS be selected to match the wire size, and never go over that figure. It's OK to fuse under the rating of the wire if the equipment it's powering doesn't pull much current. I'm not sure where you got the 10amp figure, but a simple fan will not draw even close to that amount of current, even on startup.

Got a link to the fans?
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Old 05-21-2013, 01:55 PM
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That's real low for fans, most I've seen are all 12 volt... I'd like to see them too.
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Old 05-21-2013, 04:53 PM
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they are 12 v computer fans, that light up purple. i have 4 so at 2.4v each, i thought a 10 amp fuse would be good. i wanted them on with the amps, so i would use a relay, off of my remote turn on, to a relay, to the fuse to the fans.. and to the display on my cap. sorry if this is confusing, im on my phone at work... i got them on ebat, for 12 bucks. the pics are on there too see.. i dont know how to post the pic from my phone, sorry...
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Old 05-21-2013, 05:15 PM
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parallel circuits give full voltage to all components in the circuit.

12v 12v 12v 12v

and their amperage draw.. is 0.16 Amps each.. a 1amp fuse would suffice.
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Old 05-21-2013, 10:41 PM
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http://www.ebay.com/itm/4-LOTS-PURPL...item5897a484d2

that's them^^. Should I fuse the cap's display, or amplifiers rmt turn also?
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Old 05-21-2013, 10:47 PM
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you can fuse it all once 'in the relay's power input' and be done with it. you don't need more than 3amps total even with turning on the amps, fans and powering the display.
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Old 05-22-2013, 10:48 AM
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Not sure if you need this but I'll post it anyway in case someone searches for an answer at a later date...




relay trigger wiring switch remote terminal multiple amplifiers
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Old 05-22-2013, 11:15 AM
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Default Relays have always been my biggest issue..

I searched and got:
87 = +12V fused
86 = from rmt turn on
85 = ground
30 = output


dammit
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Old 05-22-2013, 11:58 AM
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[Audiotherapy is correct] {thanks}





HD SPDT Relay Harness 12VDC 5 Pin 30 40 A | eBay



I suggest re-pin-ing the harness to make sense for your application. [move the correct color to the correct location]

87 = output [yellow]
86 = from rmt turn on [blue]
85 = ground [black]
30 = +12V fused [red]

Last edited by iamsonic; 05-22-2013 at 12:00 PM.
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