Hi Randy
Happy to help. Strangely, I was looking at that switch about 5 mins before I read your post!
So, the switch is a plunger fitted into a hole in the LHS leading edge of the bonnet. There is a rivet/screw? on either side (now rotted away).
https://goo.gl/photos/kBBpRoyMhAidC2WL6The switch itself is also rotten beyond repair. EDIT: I'm pretty sure it's a Linread switch, from the diamond shape.
https://goo.gl/photos/bWJ6z5UeP9ynANYE9Trapped underneath one fixing is a short single black wire leading to a bullet, which in mine was unattached to anything else. Another black wire of the same length was unattached to anything, perched on the chassis. There's no evidence of where the second wire is attached.
https://goo.gl/photos/EHCwCxEWbLJzDHXv5Nearby you can see there is a small subloom, consisting of 2 red/whitestripe, and 2 black bullet sockets. The black ones fell off before I could take this pic. There is just one black (earth) wire feeding the bullet sockets, but two individual red/whitestripe wires:
https://goo.gl/photos/X5k6hD7hL2bgs6SC8That threads vertically down past the radiator bottle, and then into the left wing (looking like it's heading for the LHS engine bay light). Meanwhile, the loom branches and a thin subloom runs up towards the RHS engine light.
I've tested for continuity, and the red/whites
are connected to the red/white wire on the lamps on either side. So it's definitely a sub loom just for the engine lights.
https://goo.gl/photos/zYoqrNdaJeyrBwz26So I'm missing some wires between the switch and the subloom, but until I get a new switch I won't be able to tell how it goes together. I don't really understand how the switch works, though clearly it is depressed when the bonnet is shut (there are score marks on the bodywork), and then pops open and makes the connection. Any ideas for a replacement? Must be a parts bin job, I'd imagine!
I'll check about your trim panel later today!
All the best from London
Ned