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Old 10-21-2013, 05:39 AM
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Glow plug resistance

I ohm tested my GPs yesterday and i got some interesting results. Im getting ~2.2 for all of them except GP #6 im getting ~1.8. What do those numbers mean? I thought they were supposed to be all at ~1.0 ohms. It doesnt seem likely that they all are going bad at the exact same rate at the exact same time other than cylinder 6 or could i have used the multimeter wrong?
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Old 10-21-2013, 06:34 PM
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Do you "zero" the meter by shorting the leads before taking measurements? Also are you using the correct scale for the expected resistance? Cheers!
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Old 10-22-2013, 04:57 AM
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Originally Posted by Patrick Feeley View Post
Do you "zero" the meter by shorting the leads before taking measurements? Also are you using the correct scale for the expected resistance? Cheers!
Yes i touched the leads together and it would read then when they were separate it showed infinite. As for scale i used the 200 ohm(lowest) is that right?
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Old 10-22-2013, 05:15 PM
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Sounds like you are correctly measuring. It does seem odd though. I know my "cheap" multimeter will not zero even with leads shorted (it will read about 1.2 ohms, where my Fluke will. How many miles are on your GPs? Cheers!
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Old 10-23-2013, 05:21 AM
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Quote:
Originally Posted by Patrick Feeley View Post
Sounds like you are correctly measuring. It does seem odd though. I know my "cheap" multimeter will not zero even with leads shorted (it will read about 1.2 ohms, where my Fluke will. How many miles are on your GPs? Cheers!
Well i talked to the electric guy at work and he said you gotta subtract the ohms that the leads read touched together from the reading you get from testing so when i do that i get .9 ohms so well in spec but the 1.8 on cylinder 6 is .5 so that one may need replaced some time in the near future.

As for miles i havent the slightest truck has between 190000-250000 miles(odometer replaced by POs PO so how reliable that is is relative) so it honestly could still be the same ones from factory because the VCs look pretty undisturbed.
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