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AC Delco Alternator wiring
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B26240 View Drop Down
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Joined: 21 Nov 2009
Location: mn
Points: 3866 		Post Options Post Options   Thanks (0) Thanks(0)   Quote B26240 Quote  Post ReplyReply Direct Link To This Post Topic: AC Delco Alternator wiring
    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 !
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 89138 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post 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.
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
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Points: 89138 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post 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.
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Joined: 11 Sep 2009
Location: wisconsin
Points: 34430 		Post Options Post Options   Thanks (0) Thanks(0)   Quote JC-WI Quote  Post ReplyReply Direct Link To This Post 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.
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The truth is the truth, sugar coated or not. Trawler II says, "Remember that."
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Joined: 21 Nov 2009
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Points: 3866 		Post Options Post Options   Thanks (0) Thanks(0)   Quote B26240 Quote  Post ReplyReply Direct Link To This Post 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
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