[diesel_mercedes] Basic Glow Plug Testing

 



I'm with Alan here ;

Most of the time when they fail they go open circuit so it's far easier to just unplug the glow plug relay on the left inner fenderwell and use a test light to see , connect the test light's clip to the + battery cable and touch the lights tip to the engine to insure the light is connected and working , then simply touch the tip to each female connector inside the connector , the test light *must* glow equally brightly for each of the five (or four 240D's) connectors .

If a pre 1981 model with series wired (FAT) glow plugs , the entire glow plug system will either make your test light light up or not .

If not , don't waste one penny on those crappy original typ glow plugs , up grade them to parallel typ and enjoy easier , faster starti9ng in all weather .

DON'T rush and crank the engine the *instant* the glow plug lamp on the dashboard goes out ! waiting another 20 ~ 30 seconds will heat the glow plugs more and make the engine *much* faster / easier to start .

-Nate
          Alan  wrote :

If I had to take them out to test them, I'd replace them. I usually just disconnect the plug in the relay box and check continuity.  

 

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Posted by: vwnate1@yahoo.com
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