Using Ohm's law to diagnose a car

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In this video we diagnose a Car/Van using Ohm's Law.
I'll show a quick,easy and safe way to test glow plugs.
The wiring Diagrams used in the video;
www.diagnosexl...
Ditex Relative compression tester;
Main website;
www.autoditex.com/
Holland;
www.diagnosexl...
Ireland/UK
www.ryansautom...
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(Not for technical questions)