2nd battery (frame) cuttoff switch 2001 7.3

[bonedoc]

Unreng......thank you sir!

[1DogRescuer]

You should find an OE interrupt option for that harness. Sites like FordPartsGiant, TascaFordParts ….
Another alternative would be high current BlueSea Disconnect (red knob).
Last, Anderson PowerPole connectors.

[Vanimal]

Years ago I cut the frame rail battery cable and installed a heavy duty Ford style ignition relay. I mounted it to a ignition wire. When I turn ignition to run it energizes relay to give power and charge but isolates them when off. I was getting a parasitic draw on my frame battery, still don't know why but it cured the issue?

[porschedpm]

what about using a high amp connector plug like this:

https://www.amazon.com/dp/B08877PMQP...n_1_title&th=1