you hooked the "light power" for the CD to the wrong thing?
unplug the CD player, and meter where voltage is (permanent power), then turn on IGN and do same again...
then turn IGN off and turn lights on the park and check voltage, then turn lights to on and check again.
then check those voltages are in the right place on the radios plug
it sounds like you have somehow wired the "light" power for the CD to earth..
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