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Old 11-22-2013, 12:00 AM
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testing glow plugs

suppose I could do a search, but's been awhile and this is so much more personal,

so my question, when testing the glow plugs, attach the test light to the positive terminal?
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  #2  
Old 11-22-2013, 06:32 AM
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Yes, that way you can check for continuity through the glow plug. It gives the test light a ground.
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Old 11-22-2013, 09:44 AM
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thanks for the confirmation Fellro. I did do an internet search last night, too. I haven't been pulling the wires off when I checked the plugs recently, would that give a false reading? When I don't plug the old girl in, she starts real hard. Gonna pull the air filter off tomorrow, and check the plugs the right way.
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Old 11-22-2013, 10:28 AM
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Yes, because the light can ground through any of the glow plugs in the harness. You have to unplug to isolate the one you are testing.
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My trucks:
The workhorse, 86 F250 4x4 6.9 nat aspirated, 3.25 exhaust, custom intake, electric fuel pump, otherwise well used stock... not real pretty but just loves to work!

The other heavy hauler, 92 F350 2wd dually crew cab, flatbed/toolboxes, 92 Cummins VE 12V with intercooler, NV4500 manual

The beater: 88 F250 4x4, 5.8 5 speed
The project ... 1978 F150 4wd shortbed 351 auto

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I do most all of my own work so I know who to complain to..Roger
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