Does anybody know what this white wire connects to? It’s coming from the wiring harness. It looks like it’s solid white. Does it have anything to do with my instrument cluster lights or tail lights? Here’s a few pictures thank you.

 

Too many changes to that harness too be 100% where it landed originally, maybe something aftermarket maybe not?
I would do a continuity check between that white wire and the curtsey lamp at the trip-reset cable bracket.
That would be my first troubleshooting approach..

 

First, start with what's not working. Why are you asking about the cluster and taillights? Are they not working properly? What about them isn't working?

See if you can figure out whether it is the hot or ground side of a circuit. Check voltage to ground. This likely isn't a ground wire. Does it have 12v on it? If so, check resistance to the battery + terminal. If that is low (<10ohms) it's likely a power feed to something. If it's higher, it's likely a signal that gets grounded to turn something on. If that's what it is you can momentarily ground it to turn on whatever it goes to (CAUTION - be ready for blown fuses if you try this).

If it's on the ground side of a circuit, (zero volts but measures some resistance to ground) you can do the inverse by jumpering it to +12v. Here it would be better to use a fused jumper - a dead short to the battery will result in some exciting sparks.

The other caution is there is a small amount of solid state electronics in these cars and you can burn them out by shorting them the wrong way. If you're not comfortable with a multimeter, get help.

Also, climb under the dash and see if there's a missing terminal within reach. It would be either brake pedal switch, clutch switch (but almost definitely not, those wires are bigger) fuse panel, or steering column. Could potentially be the door switch, but doesn't look long enough.

 

White wire (if it is Chevy factory installed) should be 12 vdc, switched and fused line. It could be to one of the interior lamps. Instrument cluster and dash lamps are gray wires.

If it's not GM/Chevy, it could be attached to anything (stereo, aftermarket alarm, etc).

 

It looks like it came with the car, my 77 vette. It's part of the wiring harness that's behind the speedometer. Oh well, no big deal I guess. I was just curious. I'm sure it goes somewhere. Thank you

 

White wire in that location. Best guess, wire going to drivers side door switch.
As above Gary. First clue. What doesn't work?
I also have a 77 and all the schematics. But I know everything works on my car. And I know what's been changed.
So, what doesn't work?

 

everything works.

 

everything works

 

That's a bugger Gary. 3 white wires to door jamb switch. One for key alarm buzzer. That works? One for security alarm system. That works? And the third for courtesy lights. And there working as well?

 

So, with door open and ignition key firmly in the switch.
Buzzer goes off?
With alarm turned on. Open door and alarm goes off?
Dome light seems obvious.
I'll have a look at schematics and see what I can find.

 

OK Gary. I really did look. Those are the only white wires in that location I can find. Sorry.

 

There are 3 white wires that exit the main dash harness in that area.
The longest is the drivers door pin switch followed by the curtsey lamp socket and the shortest being the brake switch connector...
My door pin switch wire colors may differ from yours as this harness is from a late 1977...
Like I said earlier, do a continuity test on your white wire and the white wire at the bulb socket. That circuit is one big happy loop...

 

no buzzer at all. As far as the alarm goes, it did not come with this car as far as I can tell. I have the early model 77.. I believe there’s some kind of a key or something that the tumbler is in the fender on these cars for the alarm. I don’t know. Thanks for your help. It’s not a big deal since everything works. I was just curious why a wire is just hanging there.

 

Buzzer feature was built into the horn relay in earlier C3's. These questions help point to the correct diagnosis for your problem. Are you sure that wire is not meant to power the left side interior lamp which is mounted to the bottom edge of the driver's dash pad?