I installed a stereo in my '78 Oday 25 a month ago and didn't get any power to the unit. I brought it back and got a different stereo. Hooked it up last night and we got power to it but it was very flaky. We noticed the positive wire was corroded. I know I have to run new positive and negative. But my question basically is could I have damaged the stereo because of the 32 year old wiring?