Check the harness plugs. The mag kill wire is white. Also check the black ground wire at the plugs and at the eng block. Got a loose connection/terminal somewhere along the line.
Click on the Wright logo and then support. You should be able to download an owners manual that has a wire diagram.
It ain't rocket science!
'Course if yer house has more wheels than yer truck...
" Old age ain't for sissies "