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Alternator wiring
- Thread starter Jimjordan2
- Start date
hitachi alternator wiring
Hello, Tom H!
Just wanted to read your detailed directions on how to wire a Hitachi 14231 alternator for my sv. I need to replace the Lucas alternator. I just can't get to your original posting. I am not very good at this wiring. I would appreciate your help. Thanks
ohiotom
Hello, Tom H!
Just wanted to read your detailed directions on how to wire a Hitachi 14231 alternator for my sv. I need to replace the Lucas alternator. I just can't get to your original posting. I am not very good at this wiring. I would appreciate your help. Thanks
ohiotom
ohiotom,
Tom H's write-up is available here:
http://mhartman.net/files/sunbeam/Hitachi 14231 Alternator wiring rev 2.pdf
Mike
Tom H's write-up is available here:
http://mhartman.net/files/sunbeam/Hitachi 14231 Alternator wiring rev 2.pdf
Mike
Hello Tom H
Tom H,
I am another Tom H. I live northwest of Dayton in Clayton. I have been in your neck of the woods a few times. I have been "restoring" a '67 SV for about 20+ years now.- just about to get it on the road. The alternator wiring was a big help- just have to figure out what the "r" terminal on the Hitachi alternator is. Thanks for all of your help.
ohiotom (Clayton, OH)
Tom H,
I am another Tom H. I live northwest of Dayton in Clayton. I have been in your neck of the woods a few times. I have been "restoring" a '67 SV for about 20+ years now.- just about to get it on the road. The alternator wiring was a big help- just have to figure out what the "r" terminal on the Hitachi alternator is. Thanks for all of your help.
ohiotom (Clayton, OH)
Ken Ellis
Donation Time
Ohiotom,
This post from up above has a link to a tractor site, that shows which terminal is which if not labeled:
http://www.sunbeamalpine.org/forum/showpost.php?p=172687&postcount=5
It matches the Hitachi I just installed in mine, and when integrated with Tom H.'s instructions, all worked fine.
Just be methodical and focused when you're doing the wiring, print out the notes, and check off the steps/label wires, and you'll do fine. Original wires clean up nicely with hand cleaner, removing oil and grease and revealing original colors well. I used some insulating sleeve to protect wires from header heat, and new right-angle insulated spade connectors so wires routed nicely to the side right away, instead of 'looping' toward exhaust first. You can get insulation from Jegs/Summit or some parts stores. I got mine from dead microwave ovens...
(Using the supplied pulley, I did have to slightly modify the existing alternator bracket on block, and extend the adjustable bracket at top. Also needed a metric bolt for tapped adjustment hole in alternator.)
This post from up above has a link to a tractor site, that shows which terminal is which if not labeled:
http://www.sunbeamalpine.org/forum/showpost.php?p=172687&postcount=5
It matches the Hitachi I just installed in mine, and when integrated with Tom H.'s instructions, all worked fine.
Just be methodical and focused when you're doing the wiring, print out the notes, and check off the steps/label wires, and you'll do fine. Original wires clean up nicely with hand cleaner, removing oil and grease and revealing original colors well. I used some insulating sleeve to protect wires from header heat, and new right-angle insulated spade connectors so wires routed nicely to the side right away, instead of 'looping' toward exhaust first. You can get insulation from Jegs/Summit or some parts stores. I got mine from dead microwave ovens...
(Using the supplied pulley, I did have to slightly modify the existing alternator bracket on block, and extend the adjustable bracket at top. Also needed a metric bolt for tapped adjustment hole in alternator.)
Last edited:
Ohiotom said:
I'm not sure if you want to understand the purpose of the "R" terminal, or which one it is on your Alt. On almost all 12431's I have seen the R terminal is the top of the T shaped pair of connectors. Sometimes it is labeled "S" instead or "R".
The purpose of the "R" (for Reference) or "S" (for Sense), is to provide the feedback/control signal to the regulator built into the Alt. That built in regulator will control the Alternator to maintain the correct output voltage. The wire connected to the R or S terminal will be connected at the other end to a point such as the fuse holder, so that the Alt maintains the correct voltage AT THE FUSE HOLDER. You could wire that R or S terminal with a short wire, directly to the B+ terminal. That would simplify the wiring, but then the built-in regulator would maintain the "correct" voltage at the B+ terminal, and depending on how much load current was being drawn and the resultant voltage drop you would have a slightly lower voltage in the system than the "correct" level.
Tom
I'm not sure if you want to understand the purpose of the "R" terminal, or which one it is on your Alt. On almost all 12431's I have seen the R terminal is the top of the T shaped pair of connectors. Sometimes it is labeled "S" instead or "R".
The purpose of the "R" (for Reference) or "S" (for Sense), is to provide the feedback/control signal to the regulator built into the Alt. That built in regulator will control the Alternator to maintain the correct output voltage. The wire connected to the R or S terminal will be connected at the other end to a point such as the fuse holder, so that the Alt maintains the correct voltage AT THE FUSE HOLDER. You could wire that R or S terminal with a short wire, directly to the B+ terminal. That would simplify the wiring, but then the built-in regulator would maintain the "correct" voltage at the B+ terminal, and depending on how much load current was being drawn and the resultant voltage drop you would have a slightly lower voltage in the system than the "correct" level.
Tom