Missing voltage regulator

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BenM
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Missing voltage regulator

Postby BenM » Tue May 16, 2017 5:16 pm

So my alternator is a Duralast DL7122. I did some looking and this alternator requires an external voltage regulator which the tractor doesn't have. Good catch Glen!

I don't have any experience with regulators. I did a quick price search and they look to be in the $30 to $80 range. May be a cheaper option I don't know about. Can someone recommend a regulator to me?

Alternatively, would it make more sense to put on an alternator with an internal regulator? If I am going to be shelling out $30+ anyway get a new alternator and save myself the hassle of setting up the regulator?

Opinions welcome!

inairam
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Re: Missing voltage regulator

Postby inairam » Tue May 16, 2017 5:21 pm

do not add and external regulator. Very unreliable. Add a 1 wire alternator. see recent posts viewtopic.php?f=1&t=96696
When you only have 9 horsepower you need to know the names of all of the ponies!

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Glen
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Re: Missing voltage regulator

Postby Glen » Tue May 16, 2017 5:57 pm

Hi,
I Googled the number you posted too, and it is a Delco alternator for use with an external voltage regulator. That style was used by GM from about 1963 - 1971 on many cars and trucks.
Then the Delco with internal regulator came out.
It would be easier to buy a Delco 1 wire alternator than to wire in a voltage regulator for the alternator you have. The 1 wire alternator should fit in the same brackets that the Cub has.
The rear halves of the 2 alts look different.
Here is a pic of the Delco 1 wire, model 10SI. :)
Attachments
Cub Delco 1 wire 2.jpg
Last edited by Glen on Tue May 16, 2017 6:15 pm, edited 1 time in total.

BenM
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Re: Missing voltage regulator

Postby BenM » Tue May 16, 2017 6:07 pm

Alright, new alternator it is...

Matt Kirsch
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Re: Missing voltage regulator

Postby Matt Kirsch » Wed May 17, 2017 2:24 pm

Yup, you can get a Delco 10SI that will mount pretty much in the same location, and have an internal regulator, for about $40 at one of the major auto parts chains. Even if you sit on that 10DN, and pay the core charge, it'll still be cheaper than a regulator.

Daniel H.
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Re: Missing voltage regulator

Postby Daniel H. » Wed May 17, 2017 10:02 pm

While I agree the 10si is superior, I have a 10DN on my Ferguson 35 because some 10DN alternators have a tapped shaft to run a mechanical tach drive, which is required on the Ferguson. I bought an external soild state regulator and have not had any trouble in several years of operation.

On disadvantage I have run into on the one wire setup is the battery will discharge over time. I don't know if they are all like this, but I have one a 100 that will over a couple of weeks.
The four most expensive words in tractor restoration: "We might as well..."

inairam
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Joined: Wed Jul 08, 2015 10:24 am
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Tractors Owned: 1948 with international 1000 loader
1949 with kub klipper belly mower.
1957 with c-2 mower & c-54 grader blade
1965 lo-boy with c-3 mower
1975 with homemade mower
Memberships: Rough and Tumble Engineers Historical Association;Chapter 8 IH Collectors; IH Collectors Worldwide
Circle of Safety: Y
Location: Glen Mills PA

Re: Missing voltage regulator

Postby inairam » Thu May 18, 2017 9:03 am

I wanted to clarify my comments about the reliability of the external voltage regulators was related to the Delco units used with the original generators and not external voltage regulators in general.
When you only have 9 horsepower you need to know the names of all of the ponies!

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Re: Missing voltage regulator

Postby Eugene » Thu May 18, 2017 9:32 am

Daniel H. wrote:On disadvantage I have run into on the one wire setup is the battery will discharge over time.
My Delco clone single wire alternator has a 5 milliamp draw when everything is shut off, engine not running.

To test the alternator's amp draw, remove one battery cable, multi-meter set on highest amp setting, connected between battery terminal and cable end. Read the meter, then disconnect the battery wire from the alternator, read meter again.

Automotive batteries will self deplete at around 3% per month.
I have an excuse. CRS.

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Re: Missing voltage regulator

Postby Bud-in-PA » Thu May 18, 2017 4:06 pm

I put a 1-wire Delco alternator on my TE-20. It works nice. But one thing I noticed was that if you put a charger on the battery or try to jump start your tractor you run the risk of blowing out your diodes. Disconnect the battery lead at the alternator before doing either. I didn't (twice) and had to put a new 10SI diode pack in it. What's that about doing the same thing over and over and expecting a different result!
1955 Cub Lo-boy, 1973 Massey Ferguson 165 Row Crop,
1989 Kubota L3250 TLB, 1947 Ferguson TE-20


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