Blew a 120A fuse

[ryanfreeland 10+ year member]

Setup: 4AWG power wire ran through a Crescendo 1000C4 fused with 120A fuse close to the battery.. connected to a set of Polk DB6501 components and Alpine Type-S 6x9 coax speakers in the back.

I got everything wired up and was setting the gains just running off the battery... later in the day when I started the car to leave to go back to college, the 120A fuse at the battery is blown.. there is no way it should be pulling 120A. I checked the power wire and ground wire and everything is perfect, there is no way it could short out.

Is this a battery issue?

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[jco1385 5,000+ posts]

does the POS terminal of the battery clear the hood? sounds like a dead short to pop that fuse. i popped a 150a once when my POS cable touched the NEG post on the battery.

 

[Stalin-ohaulic]

Setup: 4AWG power wire ran through a Crescendo 1000C4 fused with 120A fuse close to the battery.. connected to a set of Polk DB6501 components and Alpine Type-S 6x9 coax speakers in the back.
I got everything wired up and was setting the gains just running off the battery... later in the day when I started the car to leave to go back to college, the 120A fuse at the battery is blown.. there is no way it should be pulling 120A. I checked the power wire and ground wire and everything is perfect, there is no way it could short out.

Is this a battery issue?

There is no way it could be a battery issue. Current is not "pushed" or "forced" anywhere. Current is drawn.

Whether you say your power wire is perfect or not.... it's not perfect. It shorted out somewhere AFTER the fuse(on the amp side). It couldn't be the positive terminal of the battery shorting to the hood because that battery would short directly to itself. Current takes the path of least resistance and none would go through the power wire. The only way possible for that to happen is to have a battery in the back.

 

[jco1385 5,000+ posts]

There is no way it could be a battery issue. Current is not "pushed" or "forced" anywhere. Current is drawn. Whether you say your power wire is perfect or not.... it's not perfect. It shorted out somewhere AFTER the fuse(on the amp side). It couldn't be the positive terminal of the battery shorting to the hood because that battery would short directly to itself. Current takes the path of least resistance and none would go through the power wire. The only way possible for that to happen is to have a battery in the back.

good point. didnt think that mine was past the front. pos touched neg (chassis/frame/etc) somewhere on that wire.

 

[ryanfreeland 10+ year member]

So I guess the only explanation would be that the cable shorted somewhere, or the internals of the amp shorted. I don't have a schematic for the amp so I don't know where the stock three 30A fuses are in the current path... but those three 30A fuses were intact.

 

[Stalin-ohaulic]

So I guess the only explanation would be that the cable shorted somewhere, or the internals of the amp shorted. I don't have a schematic for the amp so I don't know where the stock three 30A fuses are in the current path... but those three 30A fuses were intact.

Then the short did not happen in the amplifier. The inputs always go right to the fuses. Why would they go anywhere else?

The short is between the amp and the fuse.

 

[jco1385 5,000+ posts]

did you use a grommet at the firewall? if not, i'd start there.

 

[ThatChevyGuy 5,000+ posts]

Trace your power/ground wires, look for melted spots

Could be a bad ground too

 

[ThatChevyGuy 5,000+ posts]

did you use a grommet at the firewall? if not, i'd start there.

Fuck your advice nigga!

 

[Stalin-ohaulic]

Trace your power/ground wires, look for melted spots
Could be a bad ground too

Nah it really can't.

 

[jco1385 5,000+ posts]

Nah it really can't.

//content.invisioncic.com/y282845/emoticons/word.gif.64b12e39f936af3b4fff38a1c0bd0244.gif

Fuck your advice nigga!

your advice sucks, yo.

 

[ryanfreeland 10+ year member]

I used one of the existing grommets through the firewall to run the power wire. I checked the entire power cable and I see no breaks in the insulation. I'm going to check again today though.

 

[ryanfreeland 10+ year member]

Ok I did a close inspection of the power wire... there are no cuts in the insulation, but these marks are suspicious. I can't tell if they are burn marks or just grease/gunk from random places where it was run.

 

[jco1385 5,000+ posts]

as long as the wire itself isn't showing, they should be fine. that looks like gunk/dirt/grease of some kind.

 

[ThatChevyGuy 5,000+ posts]

Nah it really can't.

Explain.