Static from radio when lights are on???

[Kmart06]

Just finished installing lights, horn and stereo with amp and 4 speakers on my 48V 2006 Club Car DS. Everything works great except that when the radio is on and I turn on the lights, either set I have, I get really bad static. Anyone know what would cause/fix this? Also, when the radio is on and I honk the horn the radio turns off, then starts back up. Have no clue what would cause that! I am not very good with electrical connections but with a lot of help from member Sergio I got it installed! Any help or advice would be greatly appreciated.