Grounded at the battery thanks to some alligator clips and 12 gauge wire. Meter finally produced results. I tested at the glow plug connector. Here are the results.

GP 1 = 1.5 ohm
GP 2 = 1.3 ohm
GP 3 = OL
GP 4 = 1.4 ohm
GP 5 = OL


Then I reached in and tested at the plugs themselves--or as close to touching the wand to the plug as I could get. With this test, both plugs 1 and 2 were the same, but plug 3 gave me 1.3 ohms, while plugs 4 and 5 didn't register anything.

Does this point to the harness (wire that goes between plug and relay, right?) for plug 3?

__________________
JBG
1985 TD wagon, 228k
running on grease since 3.07
AUSTIN, TEXAS