Delco SI alternator
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=148713
Printed Date: 27 Apr 2025 at 2:04pm
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Topic: Delco SI alternator
Posted By: allisbred
Subject: Delco SI alternator
Date Posted: 22 Mar 2018 at 8:06pm
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Have a tractor that sat for awhile and have to trip the relay to get the 1 wire alternator working every time the motor goes back to idle. Is the relay causing this issue or can the magnetic field be lost permently from sitting. I'm not a fan of these but, was already installed, I think they seem to draw some power when not in use.
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Replies:
Posted By: Dakota Dave
Date Posted: 22 Mar 2018 at 8:14pm
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Delco SI alternators are internally regulated and don't have a relay. If you have a relay on one it's wired wrong.
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Posted By: Coke-in-MN
Date Posted: 22 Mar 2018 at 8:22pm
The 10 SI needs a higher RPM to excite and once output is established it will stay charging or regulating internally - no magnetism involved until electric flows - as not like a generator with residual or self exciting .
If it's drawing power when off - bad diode in diode trio - replace that .
look on back and there should be a U shaped hole in back casting - just inside a bit is a tab - if you take a small screwdriver and touch case and that tab it should give you full output from alternator - if not internal regulator could also be bad
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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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Posted By: allisbred
Date Posted: 22 Mar 2018 at 8:28pm
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No external relay, you would be correct, it is the regulator that I'm thinking about in the alternator. This tractor is new to me and has not been working yet. Just trying to figure what I need to fix first.
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Posted By: allisbred
Date Posted: 22 Mar 2018 at 8:37pm
Posted By: Bill_MN
Date Posted: 23 Mar 2018 at 8:07pm
Sounds like alternator replacement is in order. One wire alternators do not belong on a tractor, use a three-wire. There's nothing wrong with the Delco if it's installed/working properly...
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1951 WD #78283, 1918 Case 28x50 Thresher #76738, Case Centennial B 2x16 Plow
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Posted By: wfmurray
Date Posted: 23 Mar 2018 at 8:31pm
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On my B i put an aternator on . To get it to exciet i put a nor open switch on .Crank engine and pull switch to on and it starts charging.Turn switch loose and it still charges untll engine stops .In nor open it will not run bat down when not in use . Works good for me.
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Posted By: jaybmiller
Date Posted: 23 Mar 2018 at 9:06pm
you could just put a smaller diamter pulley on the alternator. AIn't no way a tractors going to rev faster than a car !
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
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