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?

As I recall, the voltage at the GPs should be around 11 volts. How is your battery condition? I have found a good battery and a good synthetic oil make a big difference in cold weather starting.

Kindly explain the aforementioned discrepancy.

Oops, sorry. I meant 12.04 V at each prong in the plug on the relay (not the glow plug) where the glow plug wires plug into the relay. 10.06 V at the actual glow plug.
Just checked my battery and realised I've left my ignition on for a couple hours so it was low... about 12.00V. When I started earlier today it was about 12.5 V though.
I guess I'm wondering if it's possible that the glow plugs don't work too well if they don't get enough voltage. (I know it works real good when hooked right too the battery).
I plan on using Rotella's 5W-40 syn. this winter. I sure hope you're right about that.

You would be correct. The temperature of the plug is significantly lowered if you supply the plug with 10V rather than 12V. Check your wiring and connections at the plugs. I'd be very surprised if you truly lost 2V between the relay and the glow plug, however.

I use Rotella syn for these vehicles in all seasons. I change it at 5K. The viscosity starts to climb when you go above 5K although the soot levels still are tolerable (< 1%). I'm not sure of the cause.

Recheck the GP voltage with a fully charged battery and see if you are getting close to 11 volts. I have found the 5W40 synthetic makes a noticeable difference. Also, make sure you have your valves adjusted correctly, they should be checked/adjusted every 15K miles.

I agree, a 2 volt drop doesn't make a lot of sense. The last thing I did was check the voltage at the glow plug, so maybe I drained my battery a bit cycling the plugs. I'll charge and check in the morning.
I adjusted the valves last winter. I was surprised it didn't help with the starting too much since just about all of them were touching the cam lobes before I adjusted them.