Originally posted by RedHeartbeat@Dec 9 2005, 11:09 PM
There is a wire coming from the PCM that grounds out when there are diagnostic codes. I can't remember which wire it is that you hook it to in the wire harness behind the glove box, brown wire I believe.

All you need is a positive wire to a bulb and then ground it using the PCM wire for codes. It should light up when you turn the key on and then off when the engine starts if you're fortunate. You could just use a test light.
Thanks.
I dindn,t know you where local. We should get to gether w/ are trucks and go raise some hell.