Wiring help with HO Alternator Please!!

[Yaris Lighter]

Originally Posted by CTScott

That is a good question. The service manual does not explain if lacking that signal will cause an issue. I would say to connect it up and then try the A/C. I suspect that it will still work fine. It is probably more of an issue for "cold weather package" Yaris, which have the PTC heater. That may be what the AC ECU prevents from powering, unless it sees the alternator output signal.

Ok Scott I need your brain again!! After a closer look at the wires on the HOA, I found a 4th pin that didn't have a wire to it. Seems like they just wanted to use three wires. So I was able to rig it to where I then had 4 wires. But now... the "fun" begins.
After days of working on cutting pieces of the HOA, finding new bolts, extending wires and all that jazz I was eventually able get the HOA on and in the right place so the belt wasn't slipping off and able to spin all the wheels correctly. I hooked up all the wiring and everything seemed great but my Idiot Light was on when I started the car. I wasn't too worried at first because I have a digital gauge + terminal and the voltage was reading at 14-14.5 for a good 5-7 minutes so I just figured oh well and happy day. However, after starting the car up a second time the voltage on the gauge wouldn't go pass 12.1. It would fluctuate at 11.8-12. I turned the car off and on again with the same results. I hadn't touched anything from when the gauge first read 14+. So I pulled out my multimeter and thought maybe a connection came loose on my Voltage Regulator wiring but this is the readings I found:
S wire 11.8 v
I wire 11.8 v
L wire is only at .9 v (causing the idiot light I bet)
Lastly the M wire (the one I rigged) is at 5 v

Do I need to switch or combine some of the wires? I have them all in the right places I thought. I followed what we had discussed before so IDK what to do or what changed from the first time I turned the car on after hooking up the wiring. I’m going to unhook the M wire I assembled to see if that changes anything. Maybe the pin was unused for a reason=D. Please let me know what you think and thanks for all your help Scott!