Connecting Lights To Relays

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eeski11

Member - Posts: 4

Joined: July 23, 2018

Location: Illinois, United States

Posted: July 28, 2018 at 3:24 PM / IP Logged

I quickly drew up the lights i wanted to install and connect to two relays and be controlled with one switch. I want the lights to turn on with a switch. Would the way i drew it work correctly? I have the switch grounded and #86 going to the other. please let me know if that would work.

Connecting Lights To Relays - Last Post -- posted image.

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the12volt

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Joined: March 07, 2002

Location: Louisiana, United States

Posted: July 28, 2018 at 6:52 PM / IP Logged

No, your diagram will do nothing as it is. You're supplying ground to both sides of the coil on both relays. Either change the input and output of your switch to 12V+ or change terminal 85 on both relays to 12V+. Also, I would fuse each relay separately with a smaller fuse instead of using one 50 amp fuse.

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eeski11

Member - Posts: 4

Joined: July 23, 2018

Location: Illinois, United States

Posted: July 29, 2018 at 9:18 AM / IP Logged

That 50A fuse is coming from the battery. So i should use two fuses, one for each of the relays?

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the12volt

Administrator - Posts: 3,955

Joined: March 07, 2002

Location: Louisiana, United States

Posted: July 29, 2018 at 10:00 AM / IP Logged

Yes, preferably, or a single fuse rated at less than the current capacity of a single relay or the smallest wire's current capacity (whichever is lowest), but it may not be big enough for the total load. Again, I would fuse them separately. https://www.the12volt.com/wiring/recommended-car-stereo-wire-sizes.asp#current-draw-by-power

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eeski11

Member - Posts: 4

Joined: July 23, 2018

Location: Illinois, United States

Posted: July 29, 2018 at 2:52 PM / IP Logged

Okay thanks for that info. I tried to correct my original post, its posted below. Is my contact at pin 87 and 30 suppose to be switched? Connecting Lights To Relays - Last Post -- posted image.

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the12volt

Administrator - Posts: 3,955

Joined: March 07, 2002

Location: Louisiana, United States

Posted: July 29, 2018 at 2:59 PM / IP Logged

Your diagram will work, but make sure you add the proper fuses.

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eeski11

Member - Posts: 4

Joined: July 23, 2018

Location: Illinois, United States

Posted: July 29, 2018 at 3:04 PM / IP Logged

Thanks, i need to figure out how to properly do those calculations.

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