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Old 01-03-2017, 10:45 AM
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Diesel911 Diesel911 is online now
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Location: Long Beach,CA
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If you want you can ignore the glow plug light and keep the key in the pre-glow position until the relay timer shuts the glow plug cycle witch means you get approximately 30 seconds or total glow plug time.

When the Starter is cranking the glow plug relay is activated and the glow plugs are on.

It is also possible for the a glow plug to ohm out ok and still be no good.

In the pic is a plug I had that Ohmed out ok but if you notice the tip of the plug that is the only part that sticks out into the prechamber is not the hottest part of the plug as it should be.

The definitive way to check the pencile type glow plugs is to remove them and use a jumper cable to test them with batter voltge.
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Glow Plug Relay Troubleshooting...-glow-plug-test-bad-may-14-b.jpg  
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