Voltage after fuse holder
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=78495
Printed Date: May 14, 2025 at 7:32 AM
Topic: Voltage after fuse holder
Posted By: jdubb5005
Subject: Voltage after fuse holder
Date Posted: May 30, 2006 at 9:34 PM
Hi, my amp stopped working the other day and I am trying to figure out the problem. Right now I have looked at all the fuses, three in the amp are fine, and the one inline on power wire looks alright, but it has a little part that looks like it might have melted, but it is still continuous. The voltage I got before the fuse holder on the wire was 13.x then after the fuse it was down to 2.4, is the fuse bad, or maybe the connection in the fuse holder?
Replies:
Posted By: electrostatic
Date Posted: May 30, 2006 at 9:52 PM
yes, its blown with that amount of voltage drop. ohm the fuse just to be sure. the question now is why did it blow?
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Posted By: jdubb5005
Date Posted: May 30, 2006 at 10:50 PM
My guess is that there was too much draw on the fuse? I only had a 60 amp fuse, but after doing some research here I should have > 90 3x30 fuses on the amp.
Posted By: aznboi3644
Date Posted: May 30, 2006 at 11:40 PM
Yeah thats prolly the reason.
Normally you want to have the inline fuse as big or bigger than the total of the amplifier(s)
Posted By: luckydevil
Date Posted: May 30, 2006 at 11:54 PM
What gauge is your amplifier power wire?
Remember, the fuse on the power cable is for the power cable and not the amp. The power cable fuse should definitely be bigger than the total of the fuses on the amp though.
Posted By: jdubb5005
Date Posted: May 31, 2006 at 12:04 AM
It is 4 gauge wire, I believe it is big enough for my application power handling wise.
Posted By: djray_89
Date Posted: May 31, 2006 at 1:56 AM
my customer also experienced the same problem. his fuses kept blowing one after another. after changing his amps power cable to a larger gauge, the fuses stopped blowing. This problem was caused by the increased amp flow rate in the cable. Also, check the terminals at your amp. do any of the cables have strands shorting one another? this will blow the fuse.Make sure that all the connections are tight and not shorting.
Posted By: jdubb5005
Date Posted: May 31, 2006 at 1:20 PM
Thank you for the input, i picked up a 100 amp fuse today. Installed works like a charm.
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