Mystery wires (behind dash, vol. #99)

[WMichelsen]

Yet another mystery wire thread.
1987 911 Targa
I pulled out my fresh air blower and wiper assembly to replace the inner wiper grommets, but also to clean/lube everything.
Before I put it all back together, I wonder about a few mystery wires in there.
The blue/wht and brn/wht were tucked down under the harness and up against the firewall.
I believe these are all factory original situations... but... ??

Behind the Speedo / Tach:

1. Blue w/white, without terminal end.
   • Another thread identified this as something related to trailer wiring. I don't really understand, but I guess I can just insulate and ignore it ?? Proper credit with the links below:
   • https://forums.pelicanparts.com/porsche-911-technical-forum/1030754-help-blue-white-stripe-mystery-wire-behind-gauges-1988-911-a.html
   • LED conversion ... post #11 by user:ClickClickBoom
2. Brown w/white, with female spade terminal
   • I can't find anything that might be missing a connection
3. Black, with shielded connector
   • Similarly, can't find any mate for it.

Behind the Cigarette Lighter

1. Cluster of 4 shielded connectors
   • The way they are wrapped, clearly unused. Just curious what for?

[dictoresno]

I think you have the speedo and the tach labeled in reverse by the way. Anyways, I looked over some wiring schematics for the 87

the only brown/white I saw was for the warning system, from the seatbelt control unit to the seatbelt contact switches, power window controls, right and left door contacts, interior lights and anti theft control switch.




as for the blue/white, I see it in the intermittent wiper diagrams. it goes from the wiper intermittent control unit to the wiper motor. ill try to get better resolution pics tomorrow.

[gerakroo]

If the ones bundled on the picture are grey, white-green, brown and black-blue they are for the rear foglight switch.

The blue-white is optional for a trailer blinker light.

[WMichelsen]

I apologize for my delay. I do appreciate your responses, I just got distracted.

Regarding the bundle, I suspect you're correct, even though the colors differ. Here's a closer view of the wires:
- White w/yellow
- White w/grey
- Black w/blue
- Brown