Amplifier Fuse Causing Melt
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=18127
Printed Date: May 23, 2024 at 5:36 AM
Topic: Amplifier Fuse Causing Melt
Posted By: wmosher
Subject: Amplifier Fuse Causing Melt
Date Posted: August 26, 2003 at 8:39 PM
My friend has a 1200 watt Boss amp (dont laugh) pushing 2 10" sony xplod's. he had a 30A Fuse in the amp, and it popped. so he put a 40A fuse in, and the little plastice around where the fuse goes, is melting. the fuse under the hood also gets very hot, and burnt up the holder for it. any help would be greatly appreciated. wmosher3@tampabay.rr.com
Replies:
Posted By: xetmes
Date Posted: August 26, 2003 at 8:46 PM
If it is really 1200 watts, it is drawing around 100 amps, i assume if you are using a 30A fuse you are also using like 8 gauge wire...? Too much current draw, use the correct fuse sizes and wire sizes (if they are incorrect)
Posted By: JamesRH
Date Posted: August 26, 2003 at 8:49 PM
a few things... your power wire may not be big enough (get a bigger guage) your ground may not be connected well enough (try relocating it) 1200 watts....that is a lot of power, put the same size fuse in the amp as it came with...then make sure the fuse under the hood is about 10amps bigger It conclusions,,,,use what size fuse and power wire Boss recommends you use for that amp,,,going smaller will give such problems You might also be over loading your amp...so check what Boss says your amp can be run at and make sure the total sub impencance is not lower than that
Posted By: wmosher
Date Posted: August 26, 2003 at 8:51 PM
yes, 8 gauge wire. 60a fuse in the power wire and now 40a in the amplifier. what should i be using? or is there some other reason it is doing this?
Posted By: wmosher
Date Posted: August 26, 2003 at 8:56 PM
i dont know the fuse specifications for the amplifier.
Posted By: xetmes
Date Posted: August 26, 2003 at 9:03 PM
well having a wire larger than needed will never hurt so if the amp really puts out 1200 watts you are looking at 2-4 gauge, i would recommend 2 gauge, with maybe 100 A fuses, that should be fine since that 1200 watt rating is most likely peak
Posted By: MAXST
Date Posted: August 26, 2003 at 9:04 PM
the electrical system prolly cant take it and is heating up.
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Posted By: wmosher
Date Posted: August 26, 2003 at 9:05 PM
well, it is a BOSS amplifier. so it is probably putting out 600 watts at the most, even though it is a 1200 watt. i dont think he wants to run 2 gauge wire (for now anyways) what size fuse should he put in the 8 gauge? and in the amplifier?
Posted By: nedgeworth
Date Posted: August 26, 2003 at 9:10 PM
The amplifier fuse you should go back to running with a 30 if that is what it orginally came with. Putting a larger fuse into the amp is going to leave you with little to no protection. You will probably want around a 60amp fuse on an 8 gauge install.
Posted By: wmosher
Date Posted: August 26, 2003 at 9:18 PM
ok, thats what im saying. im having problems with it. i have a 60 fuse in the power wire, and i use a 30 in the amp and it keeps poppin, when i use a 40, it melts the plastic around the fuse on the amp.
Posted By: nedgeworth
Date Posted: August 26, 2003 at 9:22 PM
More likely than not you don't have your speakers correctly wired to your amp. Your amp is only 2ohm stable in stereo not mono. So your speakers need to be wired one to each channel of the amp and you should have no problems with blowing your fuse.
Posted By: wmosher
Date Posted: August 26, 2003 at 9:24 PM
ok, that's where im having the problem understanding it. mono meaning one of course, and stereo left and right...hmm, still kinda confused
Posted By: nedgeworth
Date Posted: August 26, 2003 at 9:27 PM
What you need to do is wire your subs to that amp as if they were normal speakers. One sub to the left channel and one to the right.
Your amp is only designed to run at 4ohms when bridged. With the way you were running your subs they were presenting the amp with a 2ohm load... hench the reason for the amp frying your fuse. So with your subs you only have one wiring option.
Posted By: wmosher
Date Posted: August 26, 2003 at 9:29 PM
ok, i think i understand now. so if they were say DVC 4-ohm speakers, then i could wire each one to 2-ohms each and in stereo. and i would get the most out of the amplifier? got it thanx for the help
Posted By: nedgeworth
Date Posted: August 26, 2003 at 9:49 PM
Yeap you've got it on the head! No probs.
Posted By: Javelin3o4
Date Posted: August 26, 2003 at 10:09 PM
try getting rid of the fuse and install a circut breaker.
Posted By: Lebult
Date Posted: August 27, 2003 at 1:27 PM
does it only use 1 30AMP fuse?? most 1200 watt Amps (peak ,not RMS) have 2 30AMP fuses
Posted By: wmosher
Date Posted: August 27, 2003 at 6:25 PM
yes, only 1 spot for 1 fuse
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