How do you adjust the backup light switch in 79 malibu? when it goes in reverse the lights only come on when its towards the park position but still in reverse then when i pull it down the lights go off. i was told before on here by i forget who that it was the switch. Also when i turn on the 4-ways the brear drivers side lights dont blink like all the others, im going to look at the wires for that tomorrow and see if i can figure it out, but just bringing it to anyones attention, maybe someone knows something about that. All the lights work except for that.