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the fuse holders are for the channels if 3/4 work an 1/2 dont an the fuse holed is disconnected , try turning on ur amp an playing a song an pull out the fuse that is connected to the bored an see if it stops playing if it does then , u would have to hook that other holed up to the bored where it was before
These amplifiers dont employ reverse polarity protection that most higher priced ones do.
The amplifier(s) are definately in need of repair - probably power supply - IF boss sells parts.
Chances are, however, the repair will meet or exceed the cost of a new (appropriately rated) entry level amplifier.
Just about anything can be repaired.... question is, are you willing to pay?
Based on your post/description, three possible reasons:
1. There is no power going into the amp. The fuses may be good but there is no +12VDC in the big red wire. You have to use a voltmeter to check if there is 12V at the end of the line/wire before it goes inside the amp. In some cases, the fuse might be good but there is corrosion on the fuse terminals and the metal contacts of where it is placed;
2. There is no switching signal to activate/power on the amp. In some setup this is a blue, yellow or orange wire. This can be activated by either the ignition switch of your car, the headunit/stereo, or even a manual on/off switch. This has to receive a 12V also to activate the amp;
3. Internal fault of the amp. The big red wire has 12V, the fuses are good, there is signal 12v to activate amp, but still no power; there is something wrong inside the amplifier. It has to be opened up and diagnosed. This may involve component level repair, circuit analysis, electronics and soldering so you might be better off seeking the services of a qualified professional.
Hope this gives you some ideas and work out for you. Good luck and pls post back how things turn up. Kind regards.
some amp has glass or plastic fuses along with a pic fuse a little green tear drop shape fuse on the board that plugs in like a fuse, see if yours has one of them if not then I'm sorry your unit is bad.