I've done exactly what you are considering.
What I did was add both a light over the passenger side (Mirror image of the
factory light over the driver's side) and a light over the sliding door.  The
DPO had installed an alarm, and as part of that install, they added a door light
switch on that sliding door and wired it into the factory interior light.

Rather than tap into other wiring, I just extended the wiring from the dome
light over the driver's door to the new ones I installed over the passenger side
and sliding door. All I needed to do was loosen and lower the headliner over the
driver compartment.

Todd
'88 Westy

lchase wrote:

> Folks,
>
> I'm in the process of installing a small interior light above the sliding
> door on my 85 Westy.
>
> Have the Vent channel above the door partially disassembled.
>
> I notice there is a black cable coming from the front.
>
> What is this and if electrical, would it be a goods place to tap for power
> to the light?
>
> If not, would you run your wiring forward or backwards and where would be a
> good place to get a hot connection.
>
> Apologies for asking a question that I could have answered myself with a
> Bentley. Had an order with Amazon that was backordered for 6 weeks.
> Cancelled it and placed a new order with B&N, it appeared they were in stock
> although a bit more expensive. That order has been backordered now for 4
> weeks. What's the deal on the shortage. Are we waiting for a new printing or
> version?
>
> lchase 85Westy
> Campbell, CA