I’ll let you know what I find. Thanks for the ideas. Unfortunately I got busy with work and travel so I had to step away from the car for a few days. I’ll have some updates for you over the weekend thoughSince the no start problem started after you drove into your garage, the cause is likely related to the work done thereafter. During the battery relocation a wire carrying 12v was possibly pierced and shorted to the 5v circuit.
Maybe this method will isolate things: Set DVOM to DC volts, put the black lead on batt (-), red lead on BRN/WHT of fuel pump connector (use hooded alligator clip for that pin, or with connector separated backprobe BRN/WHT. Get a helper to start pulling fuses until the 11.61v becomes 5v. That will identify which circuit is shorting to your BRN/WHT circuit. Things to look at are fasteners added which can pierce wires behind panels/bulkheads and pinch points on new wires ran. Let us know what you find.