Its not the spark either, could it be a regulator?
Just changed the starter on a 96 Bravada, still wont fire up?
If the crankshaft position sensor and the camshaft sensor is out the vehicle wont get a spark. Your question wasn't detailed enough. Are you saying it wouldn't crank is that why you put the starter in. Most of the time it is a sensor. And you need to invest around 80 dollars at the parts store and buy an ODB ii scanner to find out witch sensor it is.
