Got to get the old girl starting this winter (would not start if in the lower 20's last year). So, I've tried checking the glow plug system. I have 12.34 V coming into the relay. I have 12.34 V coming into both ends of the fuse strip.. I have about 12.06 V at each of the plugs when the relay is energized. I checked the wire resistance from the relay to each plug, and all seem to read .5-.6 ohms. I took one plug out and put it on the jumper cables and it glowed very nicely. Now here's the thing...
Seeing as the WHOLE plug got wicked hot while on the jumper cables, I figured rather than pulling out the other four and testing them, I would just use by handy infrared thermometer and shoot the exterior tip of the plug while still in the engine block. As a base line, the other end of the plug I pulled out read about 90 - 100 degrees when energized by the jumper cables. So I shot the rest of the plugs in the engine block (2 or 3 glow cycles) and the temp. never budged. I figured I would at least feel the plugs get a little warmer with my fingers. Does the engine block act like a heat sink enough so that the other end does not get warm? Also, I have only about 10.06 V at the wires going into the plug during the glow cycle. Is this normal?