Question about Nitro BMW-486 Car Audio Amplifier

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Fuse keeps melting

I have a nitro 1000 watt amp. the fuse keeps blowing. the fuse holder is loose so the fuse wiggles, sparks and melts. can this be repaired? Is it possible to create an external fuse?

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Yes this can be repaired and no you wouldn't have to have an external fuse. What you need to do is first find someone that is good with a soldering iron. Next open the amplifier and look at the area where the fuse holder is located. You want to make sure that the area is clean and that the board is not damaged. To make sure that the area is clean well take some regular rubbing alcohol, 70% or higher,and a small paint brush put the brush in the alcohol and clean the area that was causing the problem regardless if there is any debris or not. This not only cleans the area but also prepares it for the solder job that is to come. Next take your soldering iron out apply solder wick to the board and remove all the old solder on the board. Make sure that you do not lift the pads that the connections are soldered to. after you have removed all the old solder from both the board and the fuse holder place the fuse holder into the slots where it belongs and apply some flux and fresh solder to the area. this will take no time to cool. be careful not to burn the board. After that has all been done put the amplifier back together and test it out. You should not have any problems after that.

Posted on Jun 04, 2010

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How can i get a replacement 5 amp 125 volt fuse for a holmes twin widow fan


It's worth noting here that it's more about the physical size & shape of the Fuse thats needed to fit your Fan.
You don't have to use exactly a 5 amp @ 125v fuse.
Any fuse that Fits and is in the range of 5,6,7,8,10 Amp and even 230v is ok.
The fuse is like a piece of soft metal that will melt if too much current is being drawn by the device. The Amps & Volts only define approximately when the fuse link will melt (blow). But as the fan gets dirty and older the LOAD it draws might get slightly higher. Enough to cause the fuse to slowly melt. So a small to 6, 8, or 10 Amp should work just fine. A wiring short will still cause the 10 Amp fuse to blow thereby keeping things safe. The manufacturer uses a fuse that fits in the space he has allocated & allows the unit to run continuously without blowing on a slight load.
But it is only a safety device to protect the device from internal shorts.
It stops a shorted motor or shorted internal wiring from getting too hot and possibly causing a fire.
But a 20 or 30Amp fuse would still blow if it is shorted.
For example...If the 5 A fuse keeps blowing then you could try say an 8 or 10 Amp fuse. If that blows then their is definitely a problem with the circuit. Don't put anything larger than 10 Amp in.
It then needs to be looked at by a service technician.


The voltage rating on a household fuse isn't that critical.
It's actually the wattage it takes to melt the fuse link. It's based on the mathematics of Ohms Law (Watts =Volts x Amps)
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I always use Ceramic ones myself, look they get HOT real HOT, BUT shouldn''t melt.
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1 Answer

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1 Answer

20A fuse melted after 8 years of service --- What should be checked after replacing fuse?


Check to be sure the fuse holder is not too loose.

With the power unplugged and a fuse in the holder, see if you can rotate the fuse in the holder with just your thumb and fingertip.

If so, the holder is loose and will overheat and melt the fuse. You cannot just squeeze it tight again, it must be replaced.

If it blows the fuse almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor. Look here.

If it blows the fuse several seconds after pressing the Start pad, that's usually a failing high-voltage transformer. Look here.

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount. Look here.

You can find links to helpful exploded view diagrams and part ordering help here.

I recommend that you bookmark that link to your favorites.


We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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There could be a lot of issues here. It sounds like you may have a short somewhere. You need to check everything with a multimeter, and possibly replace the fuse block or other wiring.
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