72 & 78 wiring harness differences

[Big_Chig#2]

Figured I would ask first. The wiring harness in my 78 FJ40 is pretty bad. I have an opportunity to purchase a used 72 FJ40 wiring harness locally but have some concerns.

Primarily, are there major differences in the tracer wire colors and the routing?

Also, I do not have to worry about smog.

I will spend some time with the 2 wiring schematics but I'm going to look at it in about 30 min and just thought about the possible differences

 

[3_puppies]

alternator is on the opposite side of the engine, wiper motor is in a different location, most of the switches are different, ignition switch is in column versus dash, etc, etc

probably not worth it even if it's free.

 

[shelfboy1]

been there tried that not worth the work better to open up the old harness and rebuild it

 

[ToyotaMatt]

alternator is on the opposite side of the engine, wiper motor is in a different location, most of the switches are different, ignition switch is in column versus dash, etc, etc

probably not worth it even if it's free.

to Add to @3_puppies valued input , The 1972 harness if for a F engine equipped FJ40 , The 1978 harness is for a 2F equipped FJ40



IMO, They are both radically different in many Too many ways , U will have Not enough wires to work with using a 1972 harness on a 1978


U need to source at least a 2F harness , and one much closer to your 1978 production date .............

 

[BeerM3]

I only know a tiny fraction of what those guys ^^^^ know but I have a '76 that I'm using a parted out '72 to fix various rusted out body issues. I can tell you the virtually nothing behind the dash will be plug-n-play from one to the other. I'd strongly recommend shipping yours off to @Coolerman if he's still in the business. While I managed to clean, fix and re-wrap my front harness with only a few minor setbacks, I still wish I'd have just sent it to him. My rear harness was a crimp-splice wasteland and the replacement he made from scratch was plug and go!