How to test Glow Plugs on all diesel engines

Simple how-to for glow plugs on diesel engines using a multimeter.
Tested on renault megane 1.5 dci, same principle applies for all diesel engines.
More info at: http://renault-repairs.com/how-to-test-glow-plugs/

Recommended Tools For This Job:

- Fluke 179 Multimemter Here: http://www.amazon.co.uk/gp/product/B007S43594/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=B007S43594&linkCode=as2&tag=yt-links-21&linkId=PMSW7VSAYXL3CTSM
- Glow Plug Socket Set: http://www.amazon.co.uk/gp/product/B002VE85AK/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=B002VE85AK&linkCode=as2&tag=yt-links-21&linkId=IXMTKHZU35ZM7USP
- Broken Glow Plug Removal Tool: http://www.amazon.co.uk/gp/product/B00ICHBUTS/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=B00ICHBUTS&linkCode=as2&tag=yt-links-21&linkId=MCRB74JEUQVXSA4G

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