Wiring repair for Sliding Door switch

[jlrftype7]

I'm guessing the grounding wire is the last Mouse chewed wire I need to replace in my Passenger Vanagon.
Tested the switch, and grounded the wire at the switch, and checked with a meter while I had the switch out as well. Mouse 1, Human 0...

But, how did VW tie the sliding door switch to the circuit originally?[ don't have my Bentley in front of me] Splice into the Drivers Dome light and run the wiring across the Headliner/Roof.?
Or did they tie into the Passenger Door wire and run it up the A Pillar, along the roof and down the B Pillar to the switch?

along those lines, can I easily use like a Electricians Fish Tool to get above the headliner and pull a wire across , or are there metal ribs /bracing I'll run into on the roof that I can't see.?
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'68 Westy- my first VW and vehicle/Bus- long gone.- sold it to a traveling Swiss couple....
'67 Type 3 Fastback, my 2nd car- gone
'69 Semi-Auto Stick Shift Beetle-gone
2017 MINI Coopers, our current DDs
‘84 Tin Top - Hilga....Auto

[Vanagon Nut]

edit: Sorry for any confusion. I deleted my images and text as they aren't really relevant.

Looking at pics of my slider door switch install on an '81 that did not have a slider door switch, I'd guess that the stock wiring for the slider door switch takes the switched ground from passenger door switch up, rearward, down pillar to slider door switch. IF it runs above the headliner, there will most likely be insulation up there, as my bus had, so that would make fishing a new wire difficult; you'd need to at least partially lower the head liner.

Neil.
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1981 Westy DIY 15º ABA

1988 West DIY 50º ABA

VE7TBN

[jlrftype7]

Thanks Neil, I had forgotten about possible insulation issues. I had read about people discussing new wiring runs, and in particular that up, backward , and then down into B pillar effort. With removing the intake grill out of the bottom of the leading face of the B Pillar to see and access your new wire when pulling it down near the switch on the opposite side.

So, I think that’s the plan for me. Splice into the wire as it sits behind the glovebox and go at it.
_________________
'68 Westy- my first VW and vehicle/Bus- long gone.- sold it to a traveling Swiss couple....
'67 Type 3 Fastback, my 2nd car- gone
'69 Semi-Auto Stick Shift Beetle-gone
2017 MINI Coopers, our current DDs
‘84 Tin Top - Hilga....Auto

[Vanagon Nut]

[jlrftype7]

[Vanagon Nut]