FastFrank,
You might want to see if your radio is installed tight. If it's lose, it might be sliding back and grounding itself out. You might have some kind of current running through out your car from a lose wire. And if your radio housing is metal and touching the cars metal(like the mounting brackets) it will short out from wronge polaritys. See if your radio is tight in its place, and make sure its not touching any bare matel behind it. Good luck.
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