I bought a Pyle marine radio new on Ebay. Bought it a few months ago and just now ready to install in my build. Hooked it up and it did not work. Thought the radio must be bad, and too late to send back, so I just bought another pyle stereo only, first one came with speakers and waterproof cover. Just now hooked up the new one I bought off of Amazon and it DOES NOT WORK. Is there something I am doing wrong or two bad radios? I wire the red to the hot of the battery and black to the ground. Did not hook up the constant hot, because I don't want the memory on all the time. The first one I actually even hooked the constanant power up just to make sure. I bought one of the amplified portable antennas. I tried grounding the antenna and the screw for the mounting bracket to another neg going back to the battery in case it needed another ground and still not working. My question is, am I missing sometihng or are Pyle stereos not good? Read reports now on Pyle stereos and three different ones stated after they sent their first one back the second one did work.