Connecting Lights To Relays

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=144629
Printed Date: May 01, 2024 at 9:06 PM

Topic: Connecting Lights To Relays

Posted By: eeski11
Subject: Connecting Lights To Relays
Date Posted: July 28, 2018 at 3:24 PM

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.

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Replies:

Posted By: the12volt
Date Posted: July 28, 2018 at 6:52 PM

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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Posted By: eeski11
Date Posted: July 29, 2018 at 9:18 AM

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

Posted By: the12volt
Date Posted: July 29, 2018 at 10:00 AM

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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Posted By: eeski11
Date Posted: July 29, 2018 at 2:52 PM

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? posted_image

Posted By: the12volt
Date Posted: July 29, 2018 at 2:59 PM

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

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Posted By: eeski11
Date Posted: July 29, 2018 at 3:04 PM

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

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