I RECENTLY CHANGED THE MOTOR OUT IN A FRIENDS 1996 TRUCK,THIS TRUCK WAS BARELY RUNNING WHEN HE BROUGHT IT TO ME. I DIDNT PAY MUCH ATTENTION TO GAUGES ETC. I DO KNOW THE ENGINE LIGHT WAS ON. THE AIR BAG LIGHT IS NOW ON, HE SAID IT WASNT BEFORE.(I HAVE MY DOUBTS) WHEN TEST DRIVING I NOTICED WHEN YOU TURN ON BLINKERS THE VOLTAGE METER JERKS EVERYTIME THE BLINKERS BLINK. IS THERE ANY CONNECTION WITH THE BLINKER,VOLTAGE METER AND AIR BAG LIGHT.

 

it may be a bad ground somewhere. check all the conections hope this helps.