Toyota Pickup Radio Replace/Remove

I Have A 1995 Toyota Pickup, I Was Recently Driving In And The Lights Started To Dim And The Radio Shut Off, I Assumed It Was My Alternator...

Toyota, Pickup Std Cab, 170000, 22re. I Have A Feedback Noise Over My Radio And When I Accelerate And Change Gears Also. High Pitch Whine Or...