15 amp fuse in place of 10 amp fuse in fuse box

[glitchmaster0001]

Hi, so I am installing some aftermarket horns in my car and the car originally came with a single horn hooked up to a 10 amp fuse. Now that I am installing a pair of aftermarket horns, I used ohm's law to calculate the total power draw, and I'm looking at around 11 amps (aka 5.5 amps per horn). I know that my 10 amp fuse with blow up if i were to hook up both horns but would I be fine if i swap out the 10 amp fuse for a 15 amp fuse? I know that installing a bigger fuse in a smaller fuse spot could be bad if there is a short circuit since it would cause a fire, but in my case i should be fine right? What are you guy's thoughts on this? I'd like to hear from people with electrical knowledge down on the comment section below. 

[gamerking]

4 minutes ago, glitchmaster0001 said:

Hi, so I am installing some aftermarket horns in my car and the car originally came with a single horn hooked up to a 10 amp fuse. Now that I am installing a pair of aftermarket horns, I used ohm's law to calculate the total power draw, and I'm looking at around 11 amps (aka 5.5 amps per horn). I know that my 10 amp fuse with blow up if i were to hook up both horns but would I be fine if i swap out the 10 amp fuse for a 15 amp fuse? I know that installing a bigger fuse in a smaller fuse spot could be bad if there is a short circuit since it would cause a fire, but in my case i should be fine right? What are you guy's thoughts on this? I'd like to hear people with electrical knowledge thoughts down on the comment section. 

if the wire can support it you should be fine if not you can have a fire or just have the wire melt which ant good either , either find out this your self,google it or ask your auto-mechanic

[dalekphalm]

4 minutes ago, glitchmaster0001 said:

Hi, so I am installing some aftermarket horns in my car and the car originally came with a single horn hooked up to a 10 amp fuse. Now that I am installing a pair of aftermarket horns, I used ohm's law to calculate the total power draw, and I'm looking at around 11 amps (aka 5.5 amps per horn). I know that my 10 amp fuse with blow up if i were to hook up both horns but would I be fine if i swap out the 10 amp fuse for a 15 amp fuse? I know that installing a bigger fuse in a smaller fuse spot could be bad if there is a short circuit since it would cause a fire, but in my case i should be fine right? What are you guy's thoughts on this? I'd like to hear people with electrical knowledge thoughts down on the comment section. 

I would advise against it, because if something goes wrong and draws too much power, the Fuse won't do it's job (won't blow), and could fry the horns, or, as noted, maybe cause a fire.

 

If you can, try and get a 12 A fuse (Dunno if you can get an 11 A one).

 

And yeah, as @gamerking noted, you've got to make sure the wire is proper gauge to handle 11 A in any case.

 

But in theory, if everything lines up, it could maybe work.

[yathis]

depends on the type of fuse, fast blow or slow blow

but 15A is fine

[HelplmChoking]

Hmmm I wouldn't. The wire should probably be okay, but if it is too light then the uprated fuse won't blow, and instead either the horn will be fried or the wires will heat to the point where they melt, possibly starting a fire.

Why do the new horns draw more than the original?

[glitchmaster0001]

Just now, Rangaman42 said:

Hmmm I wouldn't. The wire should probably be okay, but if it is too light then the uprated fuse won't blow, and instead either the horn will be fried or the wires will heat to the point where they melt, possibly starting a fire.

Why do the new horns draw more than the original?

because they are bigger and louder horns. plus it has 2 horns rather than a single horn. 

[HelplmChoking]

1 minute ago, glitchmaster0001 said:

because they are bigger and louder horns. plus it has 2 horns rather than a single horn. 

Oh okay. I mean I guess you'll be okay with the 15A fuse, although personally, I wouldn't do it (mainly because I wouldn't replace my horn, I don't see the point but you do you).

[yathis]

Yeah bro, he doesnt know what hes talking about.

15A is fine bro.

[Monkey Dust]

To be on the safe side I'd run new cable (leaving the original in place) so you can be 100% sure it's a minimum of 15A cable and fit an inline fuse. The original cable is almost certainly, probably, fine, but for the cost of a few metres of 15A cable and an inline fuse it's not worth the risk. It may also save you cutting the plug of the original loom which will make it easier to return to stock if/when you sell it.

[vetali]

15 hours ago, glitchmaster0001 said:

Hi, so I am installing some aftermarket horns in my car and the car originally came with a single horn hooked up to a 10 amp fuse. Now that I am installing a pair of aftermarket horns, I used ohm's law to calculate the total power draw, and I'm looking at around 11 amps (aka 5.5 amps per horn). I know that my 10 amp fuse with blow up if i were to hook up both horns but would I be fine if i swap out the 10 amp fuse for a 15 amp fuse? I know that installing a bigger fuse in a smaller fuse spot could be bad if there is a short circuit since it would cause a fire, but in my case i should be fine right? What are you guy's thoughts on this? I'd like to hear from people with electrical knowledge down on the comment section below. 

Knowing the year, make, and model of the car would help. In general, assuming 16AWG and nothing else runs off the circuit it should be fine. Your horns are only run momentarily, and the switch side (usually the weak point in a circuit) powers a relay rather than the whole circuit. They wouldn't run long enough for the increased current flow to cause heat in the wire. 

 

Also remember while running your car will be at a higher voltage. Anywhere between 13-14.4 volts. Which will reduce your current draw if you haven't taken that in account. 

[Foxxer]

Bad idea, even worst with socket breakers @ homes. 

[yathis]

Difference between 10A and 15A on a wire, is very small.

 

20awg to 19awg