4 gauge power supply
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=83464
Printed Date: July 06, 2025 at 10:41 AM
Topic: 4 gauge power supply
Posted By: jerryfreeman
Subject: 4 gauge power supply
Date Posted: September 28, 2006 at 4:10 PM
I have a 4 gauge power kit from fosgate which comes with a 100 amp fuse in it. Im wiring it to supply power to my punch 600 watt mono block amp, which has two 30 amp fuses on it. Is the inline 100 amp fuse to big for my amp?
Replies:
Posted By: jonathancullen
Date Posted: September 28, 2006 at 4:19 PM
from what i know, (not as much as alot of people here) no, the 100 amp fuse just takes 100 amps before it will blow, from a short. the 100 amp fuse doesnt mean it sends 100 amps to your amp. you have nothing to worry about with your wiring kit. if more then your amp fuses can handle gets to the amp without blowing the 100 amp fuse then the fuses on your amp will blow.
Posted By: jettagli03
Date Posted: September 28, 2006 at 5:45 PM
Good to know. Most people in my past have told me to match it to my amp. Matching it to the wire seems right. You learn something new everyday.
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Posted By: j_darling2007
Date Posted: September 28, 2006 at 5:51 PM
The advantage of matching it to your amp is so the fuse on the wire will blow sooner in the event of a short, offering a higher grade of protection. You always want to try to get as close to the fusing of the amps while staying under the current load of your wire. Jacob ------------- There are 3 kinds of people in the world, those who can count and those who can't
Posted By: jerryfreeman
Date Posted: September 28, 2006 at 10:22 PM
Thanks for the info, If I run a 30 amp fuse inline will I be starving much needed power from getting my amp?
Posted By: i am an idiot
Date Posted: September 28, 2006 at 10:44 PM
Should we let him know that he needs to mount the fuse at or very near the battery?
Posted By: Flakman
Date Posted: September 28, 2006 at 10:49 PM
jerryfreeman wrote:
Thanks for the info, If I run a 30 amp fuse inline will I be starving much needed power from getting my amp?
No, the fuse does not restrict current. It is merely there to fail before item it is meant to protect. The fuse at the battery is there to protect the wire (and car) from burning up. The fuse in the amp is there to protect the amp. If the fuse restricted current, it would already do it at the amp. "A $400 piece of equipment will always protect a $0.25 fuse by blowing first." ------------- The Flakman
I feel strange. I have deja vu and amnesia at the same time.
John | Manteca, CA
Posted By: aznboi3644
Date Posted: September 28, 2006 at 11:20 PM
jerryfreeman wrote:
Thanks for the info, If I run a 30 amp fuse inline will I be starving much needed power from getting my amp?
Um....if your amp is fused at 60 amps...why would you put a 30 amp inline fuse??? You'll blow that fuse in a second when you crank it.
Posted By: Flakman
Date Posted: September 28, 2006 at 11:43 PM
Good point aznboi...I missed that one. ------------- The Flakman
I feel strange. I have deja vu and amnesia at the same time.
John | Manteca, CA
Posted By: aznboi3644
Date Posted: September 29, 2006 at 12:17 AM
Cause of amnesia?? lol
Posted By: j_darling2007
Date Posted: September 29, 2006 at 7:06 AM
Yeah, a fuse doesn't restrict the current. It merely overheats and melts the metal on the inside of the fuse when the current gets too high, thus cutting the current.
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There are 3 kinds of people in the world, those who can count and those who can't
Posted By: jerryfreeman
Date Posted: September 29, 2006 at 10:52 AM
So if i leave the inline 100 amp fuse(close to the battery) or replace it with one no lower than 60 amps, either way i'll be good right? The only difference is the wire (and my truck) will be protected sooner from catching on fire and with no power loss to my amp, correct?? Is Leaving the inline 100 amp fuse more dangerous than the 60 amp fuse or is it too close to really make a big difference? Thank you Rob
Posted By: Flakman
Date Posted: September 29, 2006 at 1:41 PM
Always best to use the correct fuse rating. I'm guessing it shouldn't matter too much since you are using this fuse to protect the wiring, not the amp. The 4ga should take 100amps intact as the fuse blows. aznboi3644 wrote:
Cause of amnesia?? lol
LOL! I must need some sleep...took me a while to figure out what you were getting at! ------------- The Flakman
I feel strange. I have deja vu and amnesia at the same time.
John | Manteca, CA
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