fuse block melting

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grh372

Member - Posts: 9

Joined: February 03, 2005

Location: United States

Posted: March 05, 2009 at 9:50 PM / IP Logged

just a quick question guys. i have a 2007 honda civic si and had a stereo installed and the fuse block that was installed in the 8 guage power cable about 4 inches from the battery has completely melted for the second time in a year and the fuse isnt even popped? the cable runs to the trunk where it goes into a 1 farad cap then off to two kenwood excelon amps. whats is causing this to happen?

j.reed

Copper - Posts: 716

Joined: January 05, 2009

Location: Arkansas, United States

Posted: March 05, 2009 at 10:03 PM / IP Logged

What size fuse are you running?

grh372

Member - Posts: 9

Joined: February 03, 2005

Location: United States

Posted: March 05, 2009 at 10:10 PM / IP Logged

60 amp glass tube type fuse. the fuse survives but the stereo stops working so i open the hood and the power cable isnt attached anymore and the holder is melted and all stringy looking

j.reed

Copper - Posts: 716

Joined: January 05, 2009

Location: Arkansas, United States

Posted: March 05, 2009 at 10:17 PM / IP Logged

I have not used Glass fuses in..... well a very long time and never in car audio for power to an amp. I would try changing out fuse type to a Maxi or a ANL type. The fuse type its self may be the problem.

i am an idiot

Platinum - Posts: 13,670

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: March 05, 2009 at 10:19 PM / IP Logged

If you do get a new one of the same type, turn it over and tighten the screws that mount the terminals to the busbar. Resistance = Heat. Bad connections = Resistance.

grh372

Member - Posts: 9

Joined: February 03, 2005

Location: United States

Posted: March 05, 2009 at 10:31 PM / IP Logged

the fuse holder looks like this http://www.crutchfield.com/p_211FHXU8/StreetWires-FHXU8.html?tp=2188

j.reed

Copper - Posts: 716

Joined: January 05, 2009

Location: Arkansas, United States

Posted: March 05, 2009 at 11:00 PM / IP Logged

The way the glass fuse is held in place i can almost promise is your problem. Just from engine running, bumps and such causing the fuse to move just a little bit and vibrate inside the holder is enough to make a bad connection. Introducing resistance and building heat. Switch fuse types. The only fuse type i will use is ANL for my power wires.

jshultz

Member - Posts: 20

Joined: August 05, 2008

Location: Arkansas, United States

Posted: March 05, 2009 at 11:14 PM / IP Logged

You need to run at least a 4 gauge, 8 gauge isn't big enough for two amps.

i am an idiot

Platinum - Posts: 13,670

Joined: September 21, 2006

Location: Louisiana, United States

Posted: March 06, 2009 at 3:19 AM / IP Logged

Don't waste your time looking for a busbar and screws on that. That is a fuse holder, a fuse block is a a distribution block with multiple fuses mounted to it. An AGU fuse is a decent fuse, until the industry went pretty. Those fuse holders do not allow heat to escape from the fuses. As stated earlier you need a larger wire and an ANL type fuse.

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: March 06, 2009 at 9:09 AM / IP Logged

jshultz wrote:

You need to run at least a 4 gauge, 8 gauge isn't big enough for two amps.

That's not true at all. Power wire gauge size is determined by system current draw, not by how many components are being powered. https://www.the12volt.com/info/recwirsz.asp

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