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replacing 10 amp with 15 amp fuse

 
Old 06-25-2019, 12:24 PM
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mfi2000
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Default replacing 10 amp with 15 amp fuse

Alpine head unit and I'm adding the KTP-45A amp. says to use 15 amp fuse. Since it connects directly to the radio, can I just replace the 10 amp radio fuse with a 15 amp?
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Old 06-25-2019, 12:53 PM
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It's never a good idea to put a higher rate amp fuse than what the circuit is rated for, this could cause the wires to potentially melt and or cause a fire.
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Old 06-25-2019, 01:45 PM
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yup..going to run a wire..which is not what i wanted. Its the reason I bought that amp..so I wouldn't have to.
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Old 06-29-2019, 10:11 AM
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Funny thing is..looks like all the wire sizes for 10 and 15 amp circuits are the same..i bet it wouldnt matter
Same as going to 20 amp breaker in your house.
But ill try using the unused wire in the footwell
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Old 06-29-2019, 10:57 PM
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Originally Posted by mfi2000 View Post
Alpine head unit and I'm adding the KTP-45A amp. Says to use 15 amp fuse. Since it connects directly to the radio, can I just replace the 10 amp radio fuse with a 15 amp?
Originally Posted by mfi2000 View Post
Funny thing is..looks like all the wire sizes for 10 and 15 amp circuits are the same..i bet it wouldnt matter...
The issue is not just forcing a 10A circuit to handle 5A extra. The real danger would be actually overloading the circuit because it would have to handle both, the radio and the amp.

Assuming a 25% headroom, the radio circuit with a 10A fuse could normally be drawing up to 7.5A. The amp calling for a 15A fuse could be expected to draw around 11.25A. Therefore, connecting both, radio and amp, together on the same circuit would mean a current of 18.75A, which not only is almost double what the original circuit was rated for, but is above the new 15A fuse.
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Old 06-29-2019, 11:08 PM
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yes..thats what i figured a few hours ago..both things on same circuit...interesting alpine would design an amp like this
and expect it to plug right in to the circuit.
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Old 06-30-2019, 09:01 PM
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Weird, I have that amp and it works fine without me ever having looked at the radio fuse...
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Old 07-01-2019, 01:44 PM
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mfi2000
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I bet it will..maybe if you cranked it up it might blow the fuse..but at normal volumes i cant see it pulling 15 amps..
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Old 07-01-2019, 05:45 PM
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Originally Posted by mfi2000 View Post
I bet it will..maybe if you cranked it up it might blow the fuse..but at normal volumes i cant see it pulling 15 amps..
Just keep the 10 amp in and see if it blows
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Old 07-02-2019, 11:21 AM
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Originally Posted by Bob_VII View Post
Weird, I have that amp and it works fine without me ever having looked at the radio fuse...
Originally Posted by mfi2000 View Post
I bet it will..maybe if you cranked it up it might blow the fuse..but at normal volumes i cant see it pulling 15 amps..
I gave an "educated" opinion based on the information at hand. It was meant for a headunit requiring a 10A circuit and an additional amp requiring a 15A circuit.

Just out of curiosity, I looked for more information regarding this specific device. It is an add-on amp specifically designed to complement the same manufacturer's headunits, and it is inserted "in-line" with no independent connections. Its harnesses and connectors are designed to mate with the headunit's, and what's more important: the recommendation to use a 15A circuit is intended for both, headunit AND amp as a combo.



That changes everything. There's no need to look for a separate 15A circuit just for the amp. It's simpler to do it as per the diagram above and, as mentioned in the quoted posts, probably it will never blow the 10A fuse because of the headroom that's built-in in the manufacturer's recommendation (specially at moderate levels).

For peace of mind you could take a reading of the current it drives during normal operation before deciding to keep the 10A fuse or bump it up to 15A.

Last edited by GCG; 07-02-2019 at 11:32 AM.
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Old 07-02-2019, 11:41 AM
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Well..i cut the wire already and found the wires cut to the aux port in the centrr console..think ill tap into that and see..i sometimes tend to crank it up to overcome the top down..metallica is a fuse blower for sure..
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