I have had cold start issues for a while, in this thread: Persistent cold start problem - now below -11 C / 12 F

Today I did some checking and rechecking:

1. Redid OHM test with block heater inactive. Four plugs now measure .5-.6, the one that previously gave huge OHM reading now gives infinity.

2. Have power to top right pin in small connector at relay with ignition on.

3. When relay active I have 11.98 volts at all five male pins in relay.

4. HOWEVER, only have 9.75 volts at glowplugs when relay is activated. (I had previously used a test light on the GPs, today I used the multimeter.)

What am I seeing here?

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22