Hey guys, finally back with another diesel. I have a 2007 2500 lbz and it has thrown a code for the number 4 glow plug. I replaced what I thought was the number four (second back on drivers side) and I still get the code. I then decided to change out the second back on the passengers side. When I removed both glow plugs I ohmed them out and both were reading with resistance. My next question is where should I start to look? I still throw my code for the plug, is there any more common issues with the glow plugs or am I going to be tracing out wiring?