MTFCA Forum

I'm putting a starter in a 15 T for a friend and have run in to an issue I don't know what to do. The car has a Hitatchi alternator, and I'm unsure on how to wire it. The lead to the battery is obvious, but there are two male spade lugs on the back I do not know how to wire. I assume one is for the idiot light and one is the exciter but I do not know which is which. I have searched the internet, but I have not found a schematic for this alternator. There was not a resistor in the line, and from what I read, it needs on so the battery lead does not feed back from the exciter lead. Help please

I had one of these on one of my Fords. I do not remember the wiring, but be advised, the one that I had ran off of the generator gear. The cut-in speed was 1500 rpm. With the small gear, the car had to be moving at around 22 mph before the alternator would start to charge. With the pulley system that you show, the cut-in speed may not be an issue. Just be advised.

Do you have a working magneto? If so, you can use the output from the magneto.(its an unrectified alternator.)
I have mine set up to charge a 12V battery.

I was tasked to install an alternator unit for a customer. Looks like the same one you have.
It didnt work, so I removed it & set up the magneto to keep the battery charged. Works great.

No the magneto is gone.

This is not my car, I am repairing all the ills someone else inflicted on it some years ago

I don't remember which terminal. You can put voltage to either one. One of them will make the alternator produce output. That alternator does not have a built in regulator. Something like a WVE 1V1067 works well. It was standard equipment on a bunch of Chryslers in the late 60s.

Take a look at this https://www.ebay.com.au/itm/164280581068

Both of the replys above are very helpful, Jeff Cordes says it needs a regulator, but at one time this was a running car, and there is no regulator on this car. TRDxB2 has a very similar alternator pictured, but it does not explain if it requires a regulatoror not. I still don't know if it need a resitor or not. I'm still confused

Lack of a regulator may cause problems with excess voltage, overcharging of the battery, and overheating the alternator. IF the alternator you have is internally regulated, it does not need an external regulator, but it may require a switched "exciter" connection to battery voltage, such as the ignition primary circuit, in order to begin charging.

Waldo wrote: ↑

Tue Feb 28, 2023 7:10 am

Both of the replys above are very helpful, Jeff Cordes says it needs a regulator, but at one time this was a running car, and there is no regulator on this car. TRDxB2 has a very similar alternator pictured, but it does not explain if it requires a regulatoror not. I still don't know if it need a resitor or not. I'm still confused

I couldn't ind any specs on the alternator either. Did you check the underside of it for a model number?
Here is some info on wiring https://www.edrawsoft.com/article/alter ... agram.html

You always can remove it and take it to an alternator repair shop to see if they can tell you what you have and how to connect it

Ralph Reeder sold back in early Texas T Parts days sold Mitsubishi alternators that used an external regulator that plugged into the back using both terminals. I think their two terminals were parallel to each other instead of being 90 degrees to each other. In a pinch maybe one of them could be wired (instead of plug in) to the Hitachi. Check with a good well stocked auto parts store. Show them your alternator and the diagram (picture) that was posted on the forum. If they do not have, or can't order, you the correct regulator, you might have to wire a Mitsubishi regulator in as a replacement. Snyder's carries the Mitsubishi regulator.