3FE alternator wiring in FJ40 w/ aftermarket harness (1 Viewer)

[Devil Frog]

I have a 3FE transplant with OEM alternator and wiring my FJ40 with a generic harness and custom gauges. The harness is a 22 circuit Speedway motors Universal setup for 3 wire alternator, and the FJ62 alternator has 4 wires. This is how I am planning on wiring:

I would like to run it by some folks with wiring expertise before I inadvertently fry something. I posted in my build thread too, but that is off our local Club house forum that gets much less traffic.

Does this look reasonable? I am missing anything?

 

[tornadoalleycruiser]

This might help Tornado takes the top off 1964 SWB FJ-45 - https://forum.ih8mud.com/threads/tornado-takes-the-top-off-1964-swb-fj-45.522904/page-9#post-7591527

 

[Engineer8000]

I would run a separate "sense" wire as shown in the 3fe FSM:

The later 40s just connected the L terminal (without relay) to the brake light via auctioneering diodes with the brake fluid level switch, this doesn't work with the pressure switch set up. And the brake light will ghost in while at idle.

 

[Devil Frog]

I would run a separate "sense" wire as shown in the 3fe FSM:

Where is the "sense" circuit in the diagram you posted?

 

[Engineer8000]

Terminal 1 of the round plug (s) black wire. Your diagram shows it jumped to the white wire. Your harness should have a sense wire in it.

 

[Devil Frog]

On both diagrams it looks like the 'S' and 'B' wires go back to the + batt, your diagram shows the S going through a few fusible links before they combine. The diagram I modified came from the FJ62 FSM, here is the unmodified:

here they are combined right out of the alternator, this is a photo of the harness plug, my 'S' wire is white:

 

[Devil Frog]

I did leave out the ignition switch wiring, so here is the updated diagram:

 

[Engineer8000]

That will cause the charging voltage at your battery to be low, depending on voltage drop due to charging current. I ran mine like that for quite a while with out issue, as far as I could tell anyway.