hello everybody , i am the new proud owner of a 65 dynamic convertible but it has a few electrical problems

.i think some might be related to the prior owner instalation of a cd player...
here i go:
1-my reverse lights do not work
2-all rear lights do work when i turn the lights on but the left side is dimmer than the right side , also my right top light doesn't work when i turn the indicator on or when i brake my right bottom light is the only one getting brighter when i use the brakes
3-my left side lights (bottom and top )do not work when i brake but work when i use the indicator .
4-oh yes also when i use the turn signal , the sound from the cd player/ radio stops for about 2 to 3 seconds.
that's about it for now .. i would apprieciate any help available .. thank you