'74 wiring in frunk question? What are these wires?

[CBA]

Good morning,

I've tried reading the wiring diagram and I think you need a PhD in how to read those darn things. Needless to say couldn't figure it out so if anyone can help me identify these misc. wires it would be great. See notes between pictures.
Where does the brown / white wire connect?
Can I delete the purple wires as it looks like someone spliced into the yellow wire?
What are the white & green wire?
What is the blue wire?



Image #1. This brown & white striped wire? Can't figure out what it came off of? maybe a gauge? It barely reach the fuel/oil level gauge.. barely.
Also the "pigtail with 2 yellow wires splices with purple wires. Not sure what this is. Might have been for the old alarm? The black plug looks factory though but isn't being used for anything? Just has the loop at the end... the black wire appears to be a ground which is not connected.

Picture #2 shows a little more detail on brown & white striped wire where it goes and also where it looks like the yellow wire was cut / spliced to add the purple wires for something.

Picture # shows where the brown & whites striped wire comes from. There is 2 total wires coming from this location.

Picture 4 white is the green & white stripped wire What is the blue wire?

[proporsche]

i`m sure timmy2 will see you soon..he is an expert.
For me i would start removing the non original wires..looks like you know which once..always use power test light ..
Ivan

[timmy2]

Blue wire is for auxiliary Webasto gas heater. Ignore it.
Green/white is rear fog lamp. Ignore it.
Brown/white could be part of the brake warning system, or Glove compartment light switch?
Yellows look like there was either A/C or some alarm system installed.
Yellow from through body harness should plug into yellow from back of 6 pin through body connector.
Purple is not original. Black being grounded is not Porsche. Brown is ground for European cars.

[CBA]

Thanks Dennis. I will go through it this week to see if I can figure it out.

[Walt Fricke]

The thick purple wires look to be attached to an SAE relay holder, which itself has the white jumper wire connecting purple to purple. One of the purple wires is or was attached to a source of +12VDC. The other attached to some device. Maybe a massive stereo amp, big fog/driving add on lights, or an anti-theft system? You can trace those before you remove them. The smaller black and white wires would be the relay coil control wires. I'd trace them back - the white probably goes (or went) to a switch of some sort, and the black to ground (though polarity doesn't matter with relays).