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Originally Posted by brandoncrone
In my 79 300D, I have the loop style glow plugs and I was wondering what the resistance value out of circuit is supposed to be. All of the ones I have measure .1 ohms accros the element.
If someone knows that would be great!
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The fuse is good huh? Always suspect it first.
Loop style GPs are less than half an Ohm in resistance, just a little more than the resistance of the leads on an Ohmmeter. hard to get a valid reading on the typical Ohmeter, DVM's excluded.
Pencil style GPs are around 2.2 Ohms and are easily read on a decent Ohmeter like a Simpsoon 260. Forget it if its a Radio Shack $3.95 meter.
To test loop GP's you can connect a heavy wire (jumper cable of necessary but be careful!) from the + terminal on the battery to the GP nearest the firewall ( the one in the front is grounded) there should be a spark as current flows through the series connected plugs. I have used this to start a car when necessary (after the timer failed) yes the points take a beating in the timer box and can be burnished back to give some more life. Is the relay clicking? If not then its an indication the timer might be kaput. Or the timer relay may be receiving an "engine hot" signal, later models use a thermal switch to drop out the long ON hold time
addendum:
The wire should be at least as large as 8 Ga and can be connected to the battery + or to the three terminal connector block that the starter motor is connected to (on the right side of the engine).