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There is something shorted in the power supply. See if you can get a schematic from their website. Most likely parts to check are the voltage regulators, protection diodes and capacitors. A shorted diode will go to ground too.
i would test it even if you go with an aftermarket radio you will have to have all your power and grounds.to test it simply pull the radio out to get the the wires.The red wire is a 12 volt ignition when the key is turned on it sends 12 volts to turn the radio on,the yellow wire is 12 volt constant it should always have power on it.,and finally the black wire is your ground the easy way to test the ground is to simply take a test light and hook it onto the positive post of your battery prob the wire and make sure it lights up.To check for power just do the opposite hook the lead on the light to the ground post on the battery.you may have to have a wire ( a jumper wire) to use to hook in between the battery and the test lead on your light.
whatever watt that amp is find a computer power suply that has same or more watts, when you get it you will notice there is a large bundle of wires that go to a 10 pin or more plastic clip. if you look at it with the clip lock facing up, you will see a green wire 4th one in from the left and black ones on both sides of it, bridge the green and the black one directly on the right of it, that is what will turn the power supply on, find your 12 volt and ground on any of the smaller clips, 12 volt is yellow 5 volt is red and ground is black, just hook your remote and power wire to the yellow and ground to ground, i recommend you hook a switch to it so you can turn it off !! and i DO NOT recommend using a power supply with less watts as you amp! nor do i recommend trying a xbox 360 power supply something WILL blow!!
you will need a jumper cable to go from the box to the radio then the antenna plugs into the box at the antenna connection point.Now for DC power you will need at least some 12 gauge wire with a fuse connected to the pos and the neg. Then you connect it to the fuse box and a ground . I personally would not use one ,if my radio cannot out do yours then so what.If you can't hear my radio within 12 miles of me then I will talk to you when you get closer.You want to hook one up thats your option but I don't even want one.
How did you disconnect it?? Antenna wire?? Power supply?? Microphone?? May be that you have a short in your coax in back of radio. Try taking it loose and screw it back in. Try new coax. Turn up Mic gain knob or change microphone. Make sure power wires are connected RED to RED(+) and Black to Black(-). Try grounding radio to metal ; if inside house ground to metal water pipes, filing cabinet, breaker box or meter box or 8 foot rod into earth. Measure SWR it should read 1.1 to 1.5. Measure power supply with Voltmeter it should be 12 to 15 volts. Check antenna plug in back of radio is my guess or microphone itself.
THE BEEPS INDICATE THAT THE OVERVOLTAGE PROTECTION IS ACTIVATED,DO NOT HOOK UP ANY THING TO THAT POWER SUPPLY!!!OR THE FULL UNREGULATED VOLTAGE (20-30 VOLTS)WILL PASS FROM THE SHORTED REGULATOR TRANSISTORS TRHU YOUR GALAXY AND FRY IT.GET IT TESTED BY A PRO,USUALLY THE REPLACEMENT PARTS FOR POWER SUPPLY ARE DIRT CHEAP.
It sounds to me that the power supply you are using may be a little under powered. It's not really a bad problem as long as the voltage doesn't drop below about 10.5 - 11 volts. As for the Galaxy. I'm not real certain of the question but a Galaxy will usally use more current to make it work properly, so I would suggest a bigger ( more amps ) power supply.
Good Luck and I hope this has helped some
Ed ( Radio Man )