Any chance of photos? Wouldn't it be best to wire the alternator as close to the manufactures recommend way? The only change I make if the vehicle doesnt have a factory sense wire (ie a boat) is to run that directly to the B terminal of the alternator. I only wire about 4-5 1uz alternators a month though.
Yes, maybe it would be best to follow what Toyota recommends. My thinking behind my question was with a possible view to have a few wires removed though.
I have looked around at www through some old wiring recommemdations, my understanding of how the alternator should be wired is as follows:
the top plint in the oval socket is the S (sense) wire and should go to the + battery pole
the lower right plint is the L (light) wire and should go to the charging lamp and further to ground
the lower left plint is the IG (ignition-on) wire and should be fed positive from the ignition-on position of the key
(my assumptions;
the charging lamp should also be fed positive from the ignition-on position so that it lights up
(it was said that when the engine starts and the alternator works it will feed positive onto the L plint,
resulting in the lamp being fed 2 positives and no negatives, hence, it will switch off)
a non-return valve, ie a diode, would be needed on the L wire between the lamp and the ground connection
in order to avoid a short circuit when the alternator starts feeding + to the L plint)
in my case;
I have no charging lamp (and have no real use for one), as I have two excellent battery monitors, one for each battery,
so I see rather accurately what goes in/out of V and A to/from each battery.
The 3 wires from the oval plug vanishes into the loom - not sure where they go,
but I can say for sure that it must be quite some cable distance between the + battery pole and the S wire.
And I can say with almost certainty that there is no diode anywhere in the loom,
the wiring of the charging system could of course utilize a diode inside the ECU box without me being aware of it.
WOULD THE FOLLOWING WIRING WORK OK?:
I connect a AWG14 cable to the B bolt/nut on the alternator and the other end to the battery + pole,
or rather than the pole itself I will connect it to the positive buss nearest to the batteries.
(which battery is connected to the buss varies, could be either one or both - this is normal marine wiring).
And then I just unplug the 3 wires in the oval socket.