Gona have to get my light to come back on. I had to unhook the battery from the block to put the a/c bracket in and the light is out now. I found out the MUT-III can't communicate with these trucks unless they have an OBDII port to power up the VCI so back to the test light.

I have a cracked exh. manifold so Im pretty sure I know what the problem is but I'd like to see the codes.