Glow Plug ohm test
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Laughing Gas
Joined: Aug 2003
Posts: 836
Likes: 9
Glow Plug ohm test
My truck has been having some hard start issues with smoke on these cold mornings..(32 degrees)
I first tested my GPR. It was 12.5 on the battery side and 11.2 on the relay side.
Next I went to check the glow plugs by pulling the connector on the passenger side valve cover gasket. I grounded the multi meter on the negative battery and touched the first GP pin ...Nothing...The meter did not even move.....Tried the next pin again nothing....In fact none of the four GP pins on the passenger side registred on the ohm meter. Tried a different meter still nothing..... Tried grounding on the ac bracket...nothng.....
Did not have time to check the drives side.. What's going on?
I first tested my GPR. It was 12.5 on the battery side and 11.2 on the relay side.
Next I went to check the glow plugs by pulling the connector on the passenger side valve cover gasket. I grounded the multi meter on the negative battery and touched the first GP pin ...Nothing...The meter did not even move.....Tried the next pin again nothing....In fact none of the four GP pins on the passenger side registred on the ohm meter. Tried a different meter still nothing..... Tried grounding on the ac bracket...nothng.....
Did not have time to check the drives side.. What's going on?
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Laughing Gas
Joined: Aug 2003
Posts: 836
Likes: 9
I replaced UVCH last year with new OEM gaskets and harness. I think if the UVCH was that messed up the truck would not be running that good. Must be somehing with my method... I will go back at it tomorrow make sure I got a proper ground.
Lead Driver
Joined: Jun 2007
Posts: 7,760
Likes: 27
From: Hampton, Maryland.
Jason, did you already ohm out the glow plugs on the exterior plug atop the VC harnesses? It's very quick (less than 2 minutes) and will verify that:
a. your GP's are good
b. all GP's are connected (had an UVCH done at a dealer after it failed far from home and found out they didn't connect two of them, so I'm a bit jaded...)
Just thinking that jumping the relay won't do any good if the juice isn't getting all the way to the GP's.
9 pin connector, use the center (position 5) as the ground, ohm out the 4 at the ends of the plugs, so positions 1,2,8,9. Should all be less than 2 ohms.
a. your GP's are good
b. all GP's are connected (had an UVCH done at a dealer after it failed far from home and found out they didn't connect two of them, so I'm a bit jaded...)
Just thinking that jumping the relay won't do any good if the juice isn't getting all the way to the GP's.
9 pin connector, use the center (position 5) as the ground, ohm out the 4 at the ends of the plugs, so positions 1,2,8,9. Should all be less than 2 ohms.
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