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How do you test glow plugs for proper operation?1985 F250 6.9 diesel


You should have two

You should have two electrical connectors on each valve cover. (I am assuming this is a V8) Unplug the connector and check the ohms for the two outside pins on both sides. The two pins (4 all together) on each side of the connector go to those plugs. Do that to both connectors on each valve cover. You should get between .2-1.0 ohms if they are working properly.

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