I have a 1984 Nissian Ext Cab 2 wheel drive 2.4l engine with a headlamp problem. I replaced the headlamp switch and the problem returned in about a week. The high beam indicator is on and the dimmer switch will not work. The RH lights are real bright and the LH lights are real dim. I have ordered a new relay hoping this will fix my problem since I have replaced a second switch and the problem is still the same. Any suggestions?