High Beam/Trans Neutral?

[44SAA]

Gentlemen- I have spent a week examining my ‘80 C20 350/350 wiring manual with no avail. In short, can anyone assist in identifying this LT GRN wire. Best I can tell it is for either BU lights, Hi beams or trans neutral switch. However, my BU lights are working. The wire originates from a grommet in the firewall behind the instrument panel. It seems unusually long. I am severely colorblind and this has been a challenge…
Thank You, Single Action Army

[Getter-Done]

Does your parking brake have a switch on it?

It could be the parking brake indicator light.

[44SAA]

Thank you Getter. It does, but wiring schematic shows BLK/LT BLU and GRAY to Park SW.

[kwmech]

Looks like an added wire long ago from a previous owner

[Dead Parrot]

Green is often used for:
Temp Gauge/Idiot sender
AC clutch

Possible a PO ran a new wire while trying to figure out why the temp gauge never moved. Often happened if the OEM sender was replaced.

[temp190]

Best thing to do is start tracing it back, where does it go, what does it connect to at other end.

[44SAA]

Curiosity led to me yanking out the instrument panel. The wire wasn’t factory and probably used for POs CB hookup. Oh well, now I can take a shot at replacing the speedo needle and burned out indicator lamps. Thank you for everyone’s help.