The left front and right rear speakers on my 2001 Forester are off most of the time but come on once in while by themselves. I bought a used radio and put that in but it didn't fix the problem. I must have a bad connection somewhere. Is there any other connectors between the speakers and the radio? Where do I start? I have never been very good at electrical problems.

If you pull the radio from the dash and don't find the wiring harness to the radio loose or corroded, and pull the interior door panels on the doors that have the silent speakers and don't find the same problem I described as up front, the next place to look is at the door hinge areas. Frequent opening and closing of doors mixed with old age can pinch or break the wires where they leave the body of the car and enter the doors. Usually its right at or inside the corrogated rubber sleave that the wires go through. Good Luck!