1990 300D 2.5 Turbo is not starting. No glow plug dash light, not even momentarily.

I've been following the steps in 15-4000.

Dash bulb is good.

I've got one plug at .060 ohmes, but it is just still within tolerance. The other 4 are fine.

I'm only getting about 7.83 volts from the relay pins leading to the glow plugs. The battery is fully charged and all other trouble shooting appears to work out okay. Is 7.83 volts enough?

The glow plug relay temperature sensor does not give me any ohme return, and that is from testing directly on it.

Could a bad sensor give a signal to the relay that prevents proper operation?

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Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
92 300D 2.5 Turbo
92 300TE 4Matic

7.83v is too low. Maybe the relay or connections need cleaning. I would pull that GP and test it directly on the battery, in fact its best to test all the GP's that way. If they are not glowing red, replace them.

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Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving

Inside the Relay.
Gently
Also check your GP Relay Grounding POINT. There is one in the Engine Compartment.

9 Volts will start a conflagration in these GPs ,But 7.83 will not cut it.
You've got a Bad Connection somewhere.

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'84 300SD sold
124.128

PM sent

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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!