the glow plug relay?1st thing is disconnect the glow plug solenoid. That should slow down the battery drain problem a lot while cold cranking. Next, track down that short. P1747. A continuity test on the harness should rule that out, along with checking the solenoid.
Did it pass the buzz test eith old ICM or donor unit?
good to know! Wonder if my IDM is fried as I removed it with batteries connectedIf there is any power applied to the PCM you can cook it when you remove the plug on it. It is more likely if there is a chip removed but when working on any electronics disconnect the batteries before working on them.
makes sense, I fully charged the batteries so I want to test everything as shown; But my buddy has a pcm off his truck is it not going to work if I just unbolt the 10mm and clip in his pcm?The problem usually doesn't come up unless the key is in the ignition with power to the affected part, but with electronics you never know.
It mostly happens with the PCM when a person removes a chip from it while it is under power. I haven't heard of a problem doing it with the IDM.