Hello Brian. The glow plugs for the c223 are 6 volt rated plugs......be very careful applying 12 volts directly to them for more than about 2-3 seconds............I have not been happy with the Beck 176 1043 glow plugs when using any fuels with a higher Btu value than diesel fuel.......they burn out.......

Jerry has glow plugs at a much better price than $27 each...........

I just found a problem on both of my diesel troopers with the wiring harness for the glow plug resistor bar circuit..........at least on these two engines, the way that the harness for the small green and red wires that attach to the resistor bar is routed back to the fire wall caused a "rubbing" point that "shorted out" the two wires and I believe that is what "blew" all four of my glow plugs at one time on one of them.............

After re taping the wires, I ran the harness differently to stop the problem............

This is some thing that I will be checking on all of my trucks, pick ups as well................

regards,
crossbones