Wiring fun in a ‘78

[mn12]

Running through wires trying to figure what is what, labeling all and almost complete.
Any help is appreciated.
1978 FJ-55 with 350 GM

Does not work: Parking lights (headlight switch half-pulled), Backup lights, Rear tailgate switch
Works: Hazards, Turn, Wipers, Dome
Does not have: Lighter, Radio, Rear Heater

Up first
Lighter gauge R/B no connection. Does not go to inspection light in glove box.

 

[mn12]

#2
Loose B/R
Assume radio?

 

[mn12]

#3
R/B was connected to B/R heading to the rear loom?
Could be cig lighter?
According to the diagram I was looking at.
This DOES connect to the inspection light.

 

[mn12]

#4
Loose from under dash driver side

 

[mn12]

#5
Rear taillight area, not connected

 

[mn12]

#6
Last for now.
Rear passenger, not connected.
From a @Coolerman post, I think the B/R is backup.
?? On the B/Black

 

[RUSH55]

Do you have diagrams?

 

[mn12]

I do.
But obviously struggle with them

 

[RUSH55]

You’ll need to trace out points of origin for each of those. Nobody will be able to identify random wires. Sometimes there are wires in the looms that go to options not included in your rig.
Use an ohm meter to see if you can determine what circuit each of those originate from.

 

[Big Sexy]

Running through wires trying to figure what is what, labeling all and almost complete.
Any help is appreciated.
1978 FJ-55 with 350 GM

Does not work: Parking lights (headlight switch half-pulled), Backup lights, Rear tailgate switch
Works: Hazards, Turn, Wipers, Dome
Does not have: Lighter, Radio, Rear Heater

Up first
Lighter gauge R/B no connection. Does not go to inspection light in glove box.

View attachment 3212725

Ohmmeter is your friend...

 

[PabloCruise]

Good to see you reference @Coolerman - he has the diagrams.

x3, multi-meter is your friend!

 

[Ry24000]

It's time to educate yourself on the reading of the wiring diagram. You might print a few off and use highlighters to trace each circuit. I will vouch for the multimeter, I couldn't do my job without one!

 

[mn12]

#5 above connects to rear taillights 👍

 

[55guy]

Good luck , It"s not going 2 be easy , It"s usually 2 steps forward and one step back for me , And still not right ,
Plug in the connectors that are the same male ,female first , and trial and error the rest ????

 

[mn12]

Running power from some cheater wires and a 9V batter to see what happens.

 

[PabloCruise]

Good luck , It"s not going 2 be easy , It"s usually 2 steps forward and one step back for me , And still not right ,
Plug in the connectors that are the same male ,female first , and trial and error the rest ????

You have skillz.
My work usually goes something like - 1 step forward, 2 steps back!