wiring 3 kc lites
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=132776
Printed Date: May 14, 2025 at 6:20 PM
Topic: wiring 3 kc lites
Posted By: dezi
Subject: wiring 3 kc lites
Date Posted: November 24, 2012 at 1:38 PM
Hey Everyone! New to the forum and a little shady with wiring Relay's..
I have 3 KC Lites that I would like to wire to one switch.. I bought a 2 pack kit and a single one. The 2 pack came with the wiring and relay.. I bought another relay so I could hook up the third one but I would like them to all run off the same switch. I was told I need 2 relays as the one itself would not be good to hook up all 3 lights. Could you guys please help me with a diagram and a small write-up on the best way to hook these up to one switch using 2 relays?
Thanks for all the help
Dezi
Replies:
Posted By: howie ll
Date Posted: November 24, 2012 at 7:42 PM
Assume those lights have say 72 watt bulbs (probably less but that's up to you to tell us).
72 x 3 divide by 12 = 18 amps.
Add say 5 amps for cable loss under 25 amps.
Since all automotive relays handle at least 30 amps EACH what's the problem.
Just remember to fuse your main supply, 25 amps and each light at 7.5 to 10 amps.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: dezi
Date Posted: November 25, 2012 at 9:00 AM
They are 100 watt bulbs in them.. I think I figured it out... Will let you know
Dezi
Posted By: howie ll
Date Posted: November 25, 2012 at 9:17 AM
A 40 amp 4 pin* will easily power them, allow 30 amps for the main fuse and 10 amps on each.
Most automotive cube (Bosch/Tycho type) are rated at 40 amps continuous.
*Most 5 pin (87a) relays are 30/40 so use a 40 pin unless the 5 pin rating is 40 amps or more.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: dezi
Date Posted: November 25, 2012 at 9:29 AM
Cool.. Thanks Howie!!! Will do
Posted By: howie ll
Date Posted: November 25, 2012 at 10:00 AM
Just a couple of "teaching you to suck eggs" pointers.
Relay to be physically near to lights.
If mounted in engine bay, also physically near to battery, fused within 4" (10cms) of battery,terminals down, spray with moisture retardant and if possible get a slightly larger plastic box from Radio Shack etc. mount relay inside and seal off.
Unless for off road use in many places 100 watt bulbs are illegal.
Having said that I was doing the same thing with Cibie Oscars in the 1970s.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
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