Ford E450 Class C Dash Emergency Battery Switch issues

enblethen wrote:
OK! Does the wiring diagram in the Intellitec manual look like your setup? They may have used different components, but wiring maybe the same.
OP: I looked at the photo that shows the splice. I doubt whether that is factory.

The wiring diagram in the manual is the same as mine is wired.As for the splice I think it is factory installed,after peeling back some of the split wire loom I found the same material wrapping wire bundles and wire end connectors.