Hi guys.
Nice to meet you all.
I am new to the forum and I am doing a small project.
I have 2 regulators for my car. Both are Mitsubishi but from different car models One of the is 140a and the other one is 70a.
The 70amp alternator fits on my car and I have it as a spare. I will modify the 140amp to fit on my engine but my worry is the regulators.

Both have 2 pin plugs but on the 140a I think the pins are Field Report and Driver.
Which on current one the pins are S and L.

Is there a way to modify the 140amps regulator pins to S and L?

See the attachments for the alternator numbers
Any help would be much appreciated

Thanks
John

 

Can you find wiring diagrams for something the other alternator fits? I kind of poked around online out of curiosity on the matter and found it seems to be listed for a commodore something or another (in the U.S. here so have no clue on that).

Since they are both internally regulated I would guess it's just a labeling difference. Normally you have a light terminal for your dash light. Since they both have an L terminal I would believe that would be the light. As far as the other I couldn't tell you.

I'm not sure about Mitsubishi, but Delco alternators will usually just work with the battery connection and ground connections. Maybe try that if nothing else.

 

Can you find wiring diagrams for something the other alternator fits? I kind of poked around online out of curiosity on the matter and found it seems to be listed for a commodore something or another (in the U.S. here so have no clue on that).

Since they are both internally regulated I would guess it's just a labeling difference. Normally you have a light terminal for your dash light. Since they both have an L terminal I would believe that would be the light. As far as the other I couldn't tell you.

I'm not sure about Mitsubishi, but Delco alternators will usually just work with the battery connection and ground connections. Maybe try that if nothing else.

Yes. I am in Australia and this is from a holden commodore V6. I will take it apart and check the regulator brand and specs if that helps. I will also look if I can find any diagrams...Since the L is the same then we would like to convert the other pin to sensor for the battery voltage correct? Swapping the regulator from the spare that I have it wont work I guess?

 

Yes. I am in Australia and this is from a holden commodore V6. I will take it apart and check the regulator brand and specs if that helps. I will also look if I can find any diagrams...Since the L is the same then we would like to convert the other pin to sensor for the battery voltage correct? Swapping the regulator from the spare that I have it wont work I guess?

That was kind of my thoughts on the voltage sense, but I didn't want to assume it.

Just did a quick search hoping Mitsubishi FR pin would make it quick and easy... I found this https://www.justanswer.com/mitsubishi/7pofh-wiring-80amp-alt-mitsubishi-mirage-98-99year.html. It looks like the diagram shows the FR pin going to the PCM for some reason or another. It also shows an S terminal leading to the battery so it looks like there is a difference. I know it's not the same alternator, but it kind of shoots the labeling thought out the window.

It may be as simple as sending 5 volts to turn it on which it kind of looks like it could be... or maybe that will fry it.

Good luck!!

 

Another link to check out... https://www.dsmtuners.com/threads/4-pin-alternator-on-2-pin-car.439835/

If that information is correct the FR pin won't even need to be connected to anything in your case... it's just to let the PCM know what is happening.

Good luck!! Something about wiring up a Mitshubishi alternator to a Ford voltage regulator on a couple tractors once upon a time steered me towards this in the first place. It was the only thing we could get to fit under the hood. 7 years later they both still work!!

 

The FR pin is used by the PCM to control rotor on/off time. It is PWM controlled. The L is obviously lamp and the regulator grounds the lamp through this pin. The S terminal is the sense wire and uses this to monitor battery voltage. It is connected close to B+ terminal and monitors battery voltage. It will turn on rotor longer if voltage is low and vice versa. Your regulator is more than likely made by Mitsubishi. There are many versions of these regulators and if I had pictures and part numbers off the regulator and alternator, I could probably figure out what you need. It has been a while but I have rebuilt a few of these.

 

I'm sorry I can't help you with your question. I have twice put air bag suspensions on 60's era cars with kits that required replacing the alternator because of the additional power demands. Installing the kit and alternator required changing some fuses and relays. A possible consideration to what you're doing. Maybe someone helping you can also help with if this might be necessary or not.

 

The FR pin is used by the PCM to control rotor on/off time. It is PWM controlled. The L is obviously lamp and the regulator grounds the lamp through this pin. The S terminal is the sense wire and uses this to monitor battery voltage. It is connected close to B+ terminal and monitors battery voltage. It will turn on rotor longer if voltage is low and vice versa. Your regulator is more than likely made by Mitsubishi. There are many versions of these regulators and if I had pictures and part numbers off the regulator and alternator, I could probably figure out what you need. It has been a while but I have rebuilt a few of these.

Hi there.
Thanks a lot for the reply.
I ve posted pictures of the alternator that has the number. Its a Mitsubishi alternator A002TX1381.

I haven't taken it apart yet to see the regulator.

Please let me know.

Thanks
John

 

Hi John,

Did you eventually figure this out? it's been a long time but I have a similar issue currently

Regards
Ken

 

Mitsubishi has many regulators that fit their alternators. Post up your information in yournown thread and I will help you out. YEAR/Make/Model/Engine of car and Model # of alternator. Pictures would help