How to troubleshoot a bad engine block ground with just a simple test light. The key with this type of troubleshooting is in understanding how to "load the circuit", which in this case is achieved by holding the key in the crank position.

Engine Performance Diagnostics chapter 1

Symptoms
no crank, starter does not engage
various dash lights flickering on and off

Fix
relocate engine ground to the block

Tests shown
how to "load the engine block"
how to test for a bad battery cable
how to test the engine block ground circuit

Tools used
incandescent test light
https://www.jbtoolsales.com/otc-3633-...

Playlist
Starting, Charging and Battery system problems
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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
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On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!

Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.