I have a 92LS400 and when I have the radio on, lights, etc. and then when I roll the windows down or up the lights that light up the gear indicator in between the RPM and Speedo DIM. It also dims when the Bass is up on the radio. Does this mean I have an electrical problem as if the battery is being worked too much? if so Will a Voltage Stabilizer help combat this problem. any help is greatly appreciated