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KC 150W - What size fuse?

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Old Aug 29, 2007
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From: Amherst NY
KC 150W - What size fuse?

Well tonight, since its the first time i have been out and about at night in like 3wks... (i dont drive at night too much unless i have to) I decided to aim my KC's. well their just about where I want them, and as i was testing them out, i was cruising along at like 5mph, hit a few bumps and they went out... blew the fuse... to me that says theres a short somewhere.... i looked it over briefly with my flashlight didnt see anything obvious. but then it dawned on me....

While my truck was in the shop, i took the waag bar off and the KC's and took the fuse out so it would be easier on the guys in the shop... I put a 20amp fuse back in as i couldnt remember, if it is 20 or 25, i stayed on the safe side.... went with the smaller fuse.

Now i havent really used the KC's at all, since, i try, and actually go out of my way to NOT drive at night.... its now a HUGE fear of mine... go figure.
 
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Old Aug 29, 2007
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All I got from that is you are scared of the dark, much like most kids under 8.
 
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Old Aug 29, 2007
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can always count on you for a stupid remark..... *****
 
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Old Aug 29, 2007
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hehehe yessss
 
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Old Aug 29, 2007
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i have a 30 amp in line fuse for all four of mine
 
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Old Aug 30, 2007
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From: CT
25 is too low. Those things draw 25 themselves with no reserve for wire, connectors, relays, etc. You should be using a 30 amp fuse.
 
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Old Sep 26, 2007
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Instead of starting a new thread I'll post here on another question about my KC's.

My lights came with a 20amp fuse with a cheap plastic holder. I decided to go to Checker and pick up a quality in line fuse holder. All they had was a 30amp fuse. I bought it and I'm using it. Is it ok to run my 2 100watt lights on a 30amp fuse or shoild I look around for a 20amp like it came with. Thanks
 
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Old Sep 27, 2007
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30 is good enough, like i said i have four lights two 100w and two 130w on that 30 amp fuse and no problems. aslo as you have some knowledge and use a relay you will be fine.

Also i have two relays one per pair.
 
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Old Sep 27, 2007
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I was mainly wondering if 30amps was too much overkill for just two 100watt lights. If somethign happens will the 30amp do the job or will it be too strong. I'm not using a relay.
 
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Old Sep 27, 2007
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As long as your wiring can all handle 30 amps safely, that is all the fuse is there to protect. If something shorts out, its going to blow the 30 just as fast as it will blow the 20.
 
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Old Sep 27, 2007
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I'm not sure all of it can handle it safely. All of the wiring is 14guage. The three inches on each side of the fuse is thicker, my guess is 12guage. The thick wiring runs from my 12source through the fuse three more inches and then the whole rest of the wiring system is 14guage (wiring it came with). Thanks for helping out an electrically challenged guy.
 
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Old Sep 27, 2007
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As long as it is less than 6 FEET from the fuse to the light, 14 gauge is acceptable.
 
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Old Sep 27, 2007
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From: Phoenix Arizona
http://www.kchilites.com/faq/instruc...layHarness.pdf

That is how it's wired up. I would guess that it is more than 6'. The lights run to the switch in the cab. Then the power goes to the switch. I don't know how it would be possible to run the whol thing on only 6'. I wired it up exactly like the diagram. I used the wiring supplied by KC.
 
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Old Sep 27, 2007
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Then you need to use a smaller fuse. Put a 20 amp fuse on it and you are good for 10 feet of wire. A 15 amp fuse is too low and it will just pop so you are stuck with 20.
 
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Old Sep 27, 2007
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Thanks FireRanger! I'll look around for a 20amp fuse.
 
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Old Nov 4, 2021
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So I have two kc lights wired in with 12 gauge wire on one relay and I had a 15 amp fuse on them and it kept blowing the 15 amp fuse so I put a 20 amp fuse in it and it's not blowing the 20 amp. Will it work like that
 
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Old Nov 4, 2021
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This thread is 14 years old. I'm sure the OP has it figured out by now.... if he still has the truck.
 
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Old Nov 5, 2021
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From: Everett, WA
Originally Posted by Jonathan18
So I have two kc lights wired in with 12 gauge wire on one relay and I had a 15 amp fuse on them and it kept blowing the 15 amp fuse so I put a 20 amp fuse in it and it's not blowing the 20 amp. Will it work like that
If they are 100 watt bulbs, 20 amp will be fine.
 
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