Ok, so I found the larger plug and it has 5 leads on it, one for each gp. Ok, good.

So, I probed them incrementally.

1 and 2: OL
2 and 3: OL
3 and 4: .8 or .9, went back and forth
4 and 5: OL
5 and 1: OL

My multimeter is the Radio Shack 22-163, if anyone's wondering.

So, do I have just one good glow plug?

Thanks again!

-m

__________________
Now:
2018 Tesla Model X
1999 S500 Grand Edition 164k
1992 300D 2.5 Turbo 287k
2005 E320 4MATIC wagon
1991 Alfa Romeo 164L 99k (sleeping for a while)

Then: 96 Lincoln TC, 93 Lincoln TC, 87 560 SEL, 87 300 SDL, 80 300D, 89 560 SEC