Testing glow plugs, am I doing it right?

[buckroseau]

Having a starting problem.....it isn't. Grabbed the multi meter to check the ohm's while the plugs were still in the truck. One terminal on a ground and another on the plug bullet. While the plugs where still in the truck, 1 plug tested at 2.0 ohms. The other 7, nothing.

I pulled all 8 plugs tonight, all came out easy, no swelling. The plug by itself on the left is the one that is reading 2.0, the others don't do anything?

Am I missing something, or do glow plugs go from working to not working over the course of a few starts?

Thanks, Matt

 

[gcbennet]

I pulled and tested all of my plugs just to either confirm or eliminate them during my S3 box troubleshooting. I put my probes on the connector nipple and the outer casing and they all metered at between 2.0 and 2.5 ohms.

 

[buckroseau]

Then I must be doing it right. Seems odd that 7 would fail that quickly?