Cookie Monster

Hey guys!

So, on every Toyota I've owned so far, I've had to replace the alternator at least once.

After my most recent death of an alternator, I finally decided to bite the bullet and start the GM alternator conversion.

Today I got my hands on a 105amp 15si, got the clip with 2 wires on it, fabbed up some custom mounting hardware, and mounted it in place.

I was considering doing what others have done and bypassing, or cutting out the external regulator, but I was thinking I could splice the GM alternator after the regulator and run them both!?

I'm not very familiar with the '84's wiring as I have been spoiled, and have only owned 22r's with internally regulated alternators.

I have done quite a bit of reading on these swaps, and searched ALOT but these 84's seem to have a funky charging system setup.

I took some pictures of what I'm dealing with:

Coming off the alternator pigtail (Black ground wire not shown):



The pigtail splitting off into the regulator, and other clips and such... :



If anyone has any insight as to whether this is doable, or not I would really appreciate it!! I apologize ahead of time if I am getting anything wrong, I'm a little new to the electrical side of these trucks.

Cookie Monster

Okay so after looking through a bunch check of wiring diagrams I found this, which looks to be right!!

I added my idea of what would work as a piggy-back setup in red.



If I mount a switch on the ignition/field wire could I just run the alternator on command via in cab switch? Will the factory charging system be effected you think?

This is a 1984 22R motor I'm working on by the by.

Cookie Monster

Well, after talking to an "alternator specialist" from a reputable company i decided to run a toggle switch on the Field/Signal Wire.

Now under regular use/when it works, i can still run my factory alternator in its original configuration, but have the 15si on a switch on the dash for running lights, winch, inverter, ect.

As it sits right now, i am still waiting for my factory alternator to come in (Should be here today) but have wired my new alternator in as i drew in the diagram and everything seems to be working great! I added a couple washers to line the pulleys up, and to make the tensioner fit without twisting/bending anything.

Overall it was a pretty easy job, just took a bit of fiddling around to make everything work together.

My Idiot Light/E-Brake light is on at the moment but i assume thats becuase the factory alternator