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'84 300D/ dakota benz trk. Sold... miss it. "88 260E '91 190E 2.6 '89 Volvo 240DL "85 300D
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1,252 Posts
Discussion Starter #1
i recently saw a post on here on how to test the glow plugs while installed in the engine. i would like to confirm this procedure and my results.
i set my meter to continuity, ground the black lead, test each of the 5 female connectors coming from the glow plug relay. from my understanding, if i have continuity, the plug is bad. if thats the case, i have 4 out of 5 that are bad! am i testing this properly? the only lead that did not have continuity is the pin that is by itself at the bottom of the connector. please advise. i could take the GP's out and test individually, but if this testing procedure is accurate, it would save time doing it this way.
 

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'73 450SL, '83 300CD, '01 E320 4matic
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2,446 Posts
wow.

Forget about all that.

Unplug the plug at the relay.

Ground the black lead on your meter.

Set the meter to ohms. Use a digital meter.

Touch the red lead to the 8mm nut on each glow plug.

Each GP should test around .5 ohms.

If more than two are bad, replace them all.
 

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money pits of various forms
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.5-.9 or there abouts. I personally just test at the GP tip but to each their own.
 
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