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#1727634 - 11/01/09 06:09 PM

Amp blowing fuese.

tmorales509
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Hi, Was wondering if anyone knew why my amp would keep blowing fuses. The fuses that are on the amp itself. They are two 20amp fuses and one of them keeps blowing after having my radio on for only like 5 mins. It is a insignia amp that i had for a little over a year so i wouldnt be surprised if it is the amp itself which i think it is. The wierd thing is i took the amp outta my car with nothing Hooked to it and no power or anything, when i put a new fuse in there, i can see a little spark or if i wiggle the fuse around i can see a spark, so im guessing Maybe the amp has a short in it?

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#1727686 - 11/01/09 08:05 PM

Re: Amp blowing fuese. [Re: tmorales509]

IamMurph
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What speakers did you have connected to the amplifier? A loose terminal can cause the sparking that you are describing.

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#1727739 - 11/01/09 09:30 PM

Re: Amp blowing fuese. [Re: IamMurph]

tmorales509
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I have 2 12's Re Audio wired to 4ohms. Ive had this system for a year without no problems. I took everything outta my car too. I also was thinking maybe a wire came loose from the subs themselfs resulting in a different load resulting in the amp fuses blowing?

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#1727764 - 11/02/09 05:22 AM

Re: Amp blowing fuese. [Re: tmorales509]

keep_hope_alive
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Originally Posted By: tmorales509

The weird thing is i took the amp outta my car with nothing Hooked to it and no power or anything, when i put a new fuse in there, i can see a little spark or if i wiggle the fuse around i can see a spark, so im guessing Maybe the amp has a short in it?

amps have internal capacitors that store charge. when you were wiggling the fuses you could have shorted the caps. that would explain the sparks even though it wasn't connected to anything.

it is still a good idea to check the sub wiring. it only takes a few strands to cause a short.

it could be the amp. or just the settings. i assume you have it bridged right now. also try turning the gain down.

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#1727828 - 11/02/09 08:30 AM

Re: Amp blowing fuese. [Re: keep_hope_alive]

tmorales509
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Originally Posted By: keep_hope_alive

Originally Posted By: tmorales509

Well i didnt wiggle the fuse at first, i just tried to put a new one in after the first one blew and as soon as i touch the fuse input there is a little spark, Only does it on one fuse input. The sub wiring is good, checked that last night. And yeah the gain was another thing i was looking at since i recently highered it to about %80(higher than i thought it was). Because before the gain was like on %45 and i just recently noticed that the amp was barely pushing the subs so i turned it up a little.

Also I have my subs hooked up together and then to the amp to get a 4ohm load, like this. http://akamaipix.crutchfield.com/ca/learningcenter/car/subwoofer_wiring/2DVC_4-ohm_mono.jpg

The amp is 500watts bridged at 4ohm(how i have it now), and 300X2 @ 2ohms. Do you think it would be better if i hooked the subs for a 2ohm load to get the full power, that way i probly woudlnt have to turn the gain up that much, or would that just put more strain on the amp since its putting more power and a heavier load?

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#1728078 - 11/02/09 04:45 PM

Re: Amp blowing fuese. [Re: tmorales509]

tmorales509
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Registered: 11/11/06
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Ive hooked my speakers back up the way they were before, I'll turn the gain down and see if it helps with the problem, if not i might just end up gettin a new amp.

Update: Well i hooked everything back up, turned the gain down a little and its working so far. had it on for about 10 mins. Hopefully if works now, ill have to test it out again tomorrow..

Update 2: Ok i think i found why the fuses kept blowing. It seems i had two 20amp fuses in the amp. But the owners manual says the amp takes 30amp fuses. after i turned up the gain i think it was putting too much power for the fuses and they were blowing. $\:\/$

Edited by tmorales509 (11/02/09 08:17 PM)

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#1728173 - 11/02/09 08:33 PM

Re: Amp blowing fuese. [Re: tmorales509]

keep_hope_alive
in another life, i'm a serial killer
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ah, using correct fuses is a good idea. $\:\)$

glad you got it worked out without needing to replace the amp.

the amp may run hotter at 2 ohms stereo since current will be higher.

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