1994 LS400......lights are turning on and off! HELP
 

when i hit my right turn signal, my front and back lights go OFF. the signal still blinks though. when i hit my left turn signal i am ok. also if i hit a bump they might flicker on and off momentarily. the voltmeter reads between 12.8 and 13.4 when this happens also......not sure what it is! my brights work also but when i push the lights switch forward to activate the brights it will turn my lights off completely......the car has been doing the latter since i bought it but the former just started tonight........