Gerry, glad to hear you resolved your problem. I just had to twice return new Bosch glow plugs (india) due to failed resistance tests.
I am now awaiting replacement Beru plugs, hopefully better quality production.

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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD