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Equipment & Gear => Power Equipment & RV => Topic started by: carpsniperg2 on July 13, 2021, 12:47:49 PM

Title: Electrical: question fuse size?
Post by: carpsniperg2 on July 13, 2021, 12:47:49 PM: I am going to wire some kc driving lights into the jeep. I am going to use the factory fog light wiring harness from the jeep.
I am going to be putting a inline fuse on each line to each light.

So the question is. The lights are 55w what size amp fuse should I be running?

The wire is 14ga if that matters.
Title: Re: Electrical: question fuse size?
Post by: Ridgeratt on July 13, 2021, 12:51:44 PM: It pencils out to 4.5 amps, but you should be fine with a 7 amp fuse.
Title: Re: Electrical: question fuse size?
Post by: JimmyHoffa on July 13, 2021, 12:59:57 PM: Watts/voltage for current draw. If you figure same power when battery is a little low and current is higher, then have the safety limit for current.
Yeah, what ridgeratt says.
Title: Re: Electrical: question fuse size?
Post by: Stein on July 13, 2021, 01:32:37 PM: If you are using the factory wiring harness, I would check to see if there is already a fuse on that circuit.
Title: Re: Electrical: question fuse size?
Post by: carpsniperg2 on July 13, 2021, 01:56:16 PM: Thank for the help.

I looked and didn’t see a fuse specifically for the fog lights. So it has me wondering why it wouldn’t so I’ll just splice some inline fuses in. I have to run a extra chunk of wire from the new positions of the lights compared to the factory anyways.
Title: Re: Electrical: question fuse size?
Post by: Ridgeratt on July 13, 2021, 03:45:53 PM: Quote from: Ridgeratt on July 13, 2021, 12:51:44 PM
It pencils out to 4.5 amps, but you should be fine with a 7 amp fuse.

Correction. If they are 55w each you will need to double the amperage. So if you are just fusing a single lite it's 5 amps a side. Or you could just put a 12 amp fuse in the feed for both of them.
Title: Re: Electrical: question fuse size?
Post by: Stein on July 13, 2021, 04:26:14 PM: My guess is that it is on a fuse somewhere, there wouldn't be a #14 wire in a factory harness that doesn't have protection on it. Most likely it's combined with other loads and isn't labeled as fog lamps in the fuse panel. There are testers or you just pull fuses one at a time until you lose power there and then you know what fuse it's on. A good place to start is probably other lights, blinkers or stuff somewhat associated with it.

Adding a fuse at the load would help somewhat but you usually try to fuse them as close to the source of energy possible so you protect the entire length of wire (and load). No harm in doing so, it just makes troubleshooting potentially more challenging if you lose power and have multiple fuses on the same circuit.
Title: Re: Electrical: question fuse size?
Post by: huntandjeep on July 13, 2021, 04:29:56 PM: Quote from: carpsniperg2 on July 13, 2021, 01:56:16 PM
Thank for the help.

I looked and didn’t see a fuse specifically for the fog lights.
I believe it's either slot 3 or 4 in the fuse box behind the glove box
Title: Re: Electrical: question fuse size?
Post by: carpsniperg2 on July 14, 2021, 01:00:30 PM: I looked in the fuse box under the hood lol. Checked the one in the jockey box and it does have a fuse in there. It’s a 20amp for the fog lights.
Title: Re: Electrical: question fuse size?
Post by: huntandjeep on July 14, 2021, 03:18:52 PM: Quote from: carpsniperg2 on July 14, 2021, 01:00:30 PM
I looked in the fuse box under the hood lol. Checked the one in the jockey box and it does have a fuse in there. It’s a 20amp for the fog lights.
:tup:
Use LEDs and your golden