Voltage after fuse holder

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jdubb5005

Member - Posts: 5

Joined: May 02, 2004

Posted: May 30, 2006 at 9:34 PM / IP Logged

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?

electrostatic

Copper - Posts: 154

Joined: January 06, 2006

Location: United States

Posted: May 30, 2006 at 9:52 PM / IP Logged

yes, its blown with that amount of voltage drop. ohm the fuse just to be sure. the question now is why did it blow?

Prove your connections, use a meter!

I promise, I'll behave!

jdubb5005

Member - Posts: 5

Joined: May 02, 2004

Posted: May 30, 2006 at 10:50 PM / IP Logged

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.

aznboi3644

Gold - Posts: 2,600

This member consistently provides reliable information

Joined: May 01, 2006

Location: United States

Posted: May 30, 2006 at 11:40 PM / IP Logged

Yeah thats prolly the reason.

Normally you want to have the inline fuse as big or bigger than the total of the amplifier(s)

luckydevil

Silver - Posts: 365

Joined: July 04, 2005

Location: United States

Posted: May 30, 2006 at 11:54 PM / IP Logged

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.

jdubb5005

Member - Posts: 5

Joined: May 02, 2004

Posted: May 31, 2006 at 12:04 AM / IP Logged

It is 4 gauge wire, I believe it is big enough for my application power handling wise.

djray_89

Member - Posts: 15

Joined: May 27, 2006

Location: Malaysia

Posted: May 31, 2006 at 1:56 AM / IP Logged

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.

jdubb5005

Member - Posts: 5

Joined: May 02, 2004

Posted: May 31, 2006 at 1:20 PM / IP Logged

Thank you for the input, i picked up a 100 amp fuse today. Installed works like a charm.

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Voltage after fuse holder

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