Z50p3 no power or sound i repaced 10 amp fuse but blows again

Most fuses are 20mm in size, they also come in surge and quick blow. If in doubt go for the Quick Blow type. However fuses tend to blow if there is an overload. Often caused by a shorted power amp transistor or device. If the fuse goes again then you have a short somewhere.

Sounds like the 10 amp fuse was too small to begin with. Possibly the old alternator was too weak to blow it. 20 amp sounds more like it. Someone probably stuck the wrong fuse in at some time.

It sounds like that fuse is supplying power to more than just the amp and is being shorted out in the START mode. Normally I would think the power to the sound system would be cut off by the ignition switch in the START mode. Try to find out what else that fuse supplies power to. You can disconnect suspected trouble areas to see if that helps locate the source of the fault.

have you tried a different outlet? something my be wrong internally

It blows the fuse because a semiconductor device has developed a short (in otherwords acting like it was just a piece of wire). Because of the noise I would suspect the main amp device is the cause. It will be most likely on a heatsink.

9 amps is approx. correct. Does magnatron make an odd sound when running? If not, you will need to discharge cap then clean terminals with alcahol. Replace diode as well. Should run correctly.If blows again, replace magnatron. Suggest you put a 12 amp fast blow fuse in circuit and nor a 20 fuse.If you dont have a grill or an oven, use a 10 amp fuse.

make sure of two things one is any wires touching at the starter to ground or melted and or is the starter drawing too much amperage causing the fuse to blow.starter may have a dead short in it.

You have a blown fuse. It should be a GMA7 amp or a 5 amp. You could try to replace it and see if your TV works again. If it blows the fuse again, then there is something shorted causing the fuse to blow. Then call a good TV Tech.

does your system have power amplifier aside from your built in amp on radio? if yes, disconnect all supply then put new fuse. try this time, should not blow the fuse. then one by one, connect the supply fo your radio only, if ok, then next is the amplifier, if it blow the fuse, your power amplifier has an issue.

The amplifier probably has shorted output transistors.

Disconnect the speakers and RCA cables. Replace the fuses with two 10 amp fuses or a single 20 amp fuse. If the amp blows the fuse when it powers up, the outputs are almost certainly the problem. Don't try it with the two 30 amp fuses. The smaller fuses will provide more protection for the power supply. If the amp powers up with the smaller fuses and they don't blow, check the speakers and the wiring (for shorts to ground or shorts between wires).