AC Delco Alternator wiring
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=190809
Printed Date: 17 May 2025 at 4:46pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: AC Delco Alternator wiring
Posted By: B26240
Subject: AC Delco Alternator wiring
Date Posted: 20 Sep 2022 at 7:19pm
| Picked up a parts tractor (red) that has a delco 12 volt neg ground, it has a plug conected to terminals 1 & 2, with two small wires that went somewhere in a former life. Can I just jumper terminal 1 & 2 together and make this a one wire alt ? If not where do wire terminal 1 & 2 get connected to ? This alt turns free bearings seem fine and I would like to use it on future project. Thanks in advance for the help ! |
Replies:
Posted By: steve(ill)
Date Posted: 20 Sep 2022 at 7:58pm
#2 is hot and can be jumpered to the BIG LUG on the back that goes to the battery... #1 is the excitation and is switched on and off by the KEY or TOGGLE switch.. Normally there is a resistor or idiot light in the line to drop voltage slightly to make it KICK IN ... and you dont want FEEDBACK thru the #1 wire to the coil... could make the tractor continue to run with the SWITCH OFF. ------------- Like them all, but love the "B"s. |
Posted By: steve(ill)
Date Posted: 20 Sep 2022 at 8:01pm
|
im assuming this is the OLD STYLE LARGE 10SI alternator from the 1970-80 era... If it is a newer , smaller unit, the resistor would probably be 100 watts. ------------- Like them all, but love the "B"s. |
Posted By: JC-WI
Date Posted: 20 Sep 2022 at 11:35pm
If you have an alternator that loks like this, it is a Delcotron and uses an external regulator.  The 10SI alternators have internal regs. ------------- He who says there is no evil has already deceived himself The truth is the truth, sugar coated or not. Trawler II says, "Remember that." |
Posted By: B26240
Date Posted: 21 Sep 2022 at 6:10am
| Thanks Steve and JC It is the older style and does not look like the one in the picture, the spade connections are on the outer rim of the housing. I will wire it like the print Steve shows. THANKS Mark |