(800) 853-2651
SHOP NOW

Delco 10si altenator

W

WayneMo

Member
I have a 3 wire Delco 10si alternator on my tractor and the volt meter has dropped from 14 to 12 volts when running. I assume the problem is in the voltage regulator inside the case. I went on Ebay to find a rebuild kit but all the kits there are for 1 wire alternators! I assume the voltage regulators in the kit is different from mine. Is there any way you can use the 1 wire kit to rebuild a 3 wire alternator? Why are there no 3 wire kits shown?
What is the difference actually in the internal parts between these 2 alternators? Is it just in wiring inside the case? Please educate me!
 
Just the regulator. Some one wire kits have different one wire regs than others, in that some do wire differently inside alt and others are simple drop in and go, with no re-wiring inside. # wire reg are still available.
 
Got a couple of these a couple of years ago, work fine. I only use three wire, not a fan of one wire at all.

<a href="https://www.ebay.com/itm/Alternator-Repair-Kit-Delco-10SI-up-to-75-Amp-Chevy-Truck-GM-Olds-Pontiac-Buick-/190606801960">https://www.ebay.com/itm/Alternator-Repair-Kit-Delco-10SI-up-to-75-Amp-Chevy-Truck-GM-Olds-Pontiac-Buick-/190606801960</a>
 
In my opinion, those things are cheap. Just get another one rather than wasting time to find parts and overhaul it. When you are fixing it, you end up with a 'fixed' unit, rather than a new warrantied one.
 

It would be rare for the voltage regulator to be defective... They have a test hole sometimes referred to as a D hole... You insert a small screwdriver in the D hole to ground the regulator if it charges at full capacity its the regulator if not its something else in the alternator...

As simple as they are you will run across one that bites... Sometimes you are better off to just buy a replacement the price is not that bad... Back in the day we repaired them because they were expensive to replace..

$70 bucks are so in the 70's to mid 80's was big money you could do a lot of fix'n for that kind of money but not so much today...
 
As to parts availability, I answered your other post.

At 12 Volts it probably isn't charging at all, mite B as simple as a worn-out brush.
 
Most likely the diode trio easy to test when disassembled.can also test the regulator with a battery and a fast charger while it is out. Diode trio used to be about 5 bucks at the parts store.
 

Name: waynemo (Reserved Name)
E-Mail:
Subject: Re: Delco Alternator
In Reply to: Re: Delco Alternator posted by Janicholson on October 10,
2019 at 11:42:03:
Body of Message:

I have already rebuilt the alternator using a kit I bought on Ebay over
a year ago and don't know if the regulator is a 1 or3 wire model! I did
not know there was a difference. I will put it on the tractor tomorrow
and hope it works!
If the regulator is a 1 wire model, will I damage anything by plugging
in the #1 and #2 wires? Could I just leave them disconnected and use it?
I can see why lots of folks would use a simple 1 wire model if all you
have to do is connect the main bat lead to somewhere there is a 12v
connection to charge the battery. Glad to learn that there is a battery
drain with 1 wire models, thanks to you guys here on this site.
Thanks for all the info, I have learned a lot and found that rebuilding
the unit is quite simple once you have the parts
 
Might be a few days late on this. I had a similar problem and I just bought a new alternator on amazon. It was like sixty something bucks. I just took the pulley off the old one and put it on the new one. I'll link it.
Alternator I bought.
 
I dont think that link worked. Just google

DB Electrical ADR0152 Alternator For 1 Wire Universal Self-Excited 10Si 10 Si 63 Amp/Internal Regulator/Negative Polarity/External Fan / 10459509, 90-01-3125, 90-01-3125S, 70-01-7127SE
 
You must log in or register to reply here.

Similar threads

R
john deere 4020 12 volt conversion problem
Replies
2
Views
160
Jim.ME
J
D
3 wire altenator indicator light or diode? Ammeter guage?
2
Replies
23
Views
981
DN-N-TN
D
stevieb49829
One wire and 3/2 wire 10SI
2
Replies
27
Views
590
HFJ
H
J
1948 8N rebuild progress
2 3 4
Replies
68
Views
2K
JJay48
J
D
  • Solved
Any help on understanding this panel wiring?
2
Replies
20
Views
2K
caterpillar guy
C
Tractor Parts Tractor Manuals

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top