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Unread 05-16-2018, 02:42 PM   #1
Not Yet Wild
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Default Relay question

When I was a younger person my Dad would said get away from the wheelbarrow causes you donít know anything about machinery. As it turns out I know less about electricity but Iím learning, slowly.

I have a 2014 CC Precedent 48v that Iím going to install standard CC driving lights, two spotlights on the brush guard, a lightbar on the roof and a horn. I have installed a 48v to 12v voltage reducer and a Blue Sea fuse/ground box. Some of the items came with a wiring harness and some Iíll have to make my own. Some of the wiring harnesses have a relay. The voltage reducer will be controlled through the key switch. Given this, my question is when do I need a relay? For example, the standard CC driving lights wiring harness does not have a relay but the lightbar harness does.
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Unread 05-16-2018, 06:24 PM   #2
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Default Re: Relay question

Quote:
Originally Posted by Harley51 View Post
.....my question is when do I need a relay? For example, the standard CC driving lights wiring harness does not have a relay but the lightbar harness does.
A relay is typically used when the load youíre trying to turn off/on draws more current (amps) than the switch controlling it can handle. The following example is totally made up but the concept and reason behind it is true:

A little dashboard switch is rated to handle 10 amps. Your switching a light that draws 5 amps. Works great! Now youíve decided that that one light is not enough. Youíre cart would look cooler with 10 lights spread around it. 10 lights at 5 amps each would now draw 50 amps through your 10 amp switch. Not so great! Switch melts! So to avoid this we use a relay. Use the little switch to energize the 2 amp relay coil, not a problem there, and wire the 10 lights thru the relays 75 amp contacts. Everything is happy with no magic white smoke!

Hope this helps.
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Unread 05-16-2018, 06:37 PM   #3
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Default Re: Relay question

Thanks. Great explanation
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Unread 05-16-2018, 10:02 PM   #4
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Smile Re: Relay question

For the most part...if your lights are LEDís (which they should be) then relays wonít be needed.
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