Having a a battery monitor, I had to reroute all my grounds through a 500 amp shunt.
I've upgraded my grounds, and added some more like one from frame to engine.
From the same frame point I added a cable to the alternator(-) stud. This stud also is connected to the same engine ground that goes to my shunt. dodge vans seem to be sensitive to poor or missing grounds. I was seeking to eliminate this and increase alternator charging current as I had beefed up the Positive side of the charging circuit
I don't know if this is considered multiple path or not. The noisiest devices are my solar charge controller and battery monitor.
The only effect I notice is that Analog channel 6 out of TJ has diagonal waves running across the screen, which disappear if I pull the Solar fuse. AM radio might be affected too, but I don't often go there.
Interesting topic.