Hi and thanks for using 2CarPros.
Since the lights go out, the first thing I would be checking is for a weak or damaged ground. It sounds like something is shutting down everything. First, take a look at the first picture I attached, it is of the engine control module's ground location. I added that one because it shuts the engine off. However, the second is where I feel the problem may be. The second picture is of the primary "all activity" ground. Check these and let me know what you find.
I noted you indicated you are a mechanic. Most likely, you won't need these, but I am adding them in case you do.
If you need anything else, let me know.
Take care and Happy New Year,
Images (Click to enlarge)
Sunday, December 30th, 2018 AT 9:11 PM