Delco 10 SI voltage regulator question

55 50 Ron · Jun 6, 2022

If the connecting wire between the main alternator output and pin 2 of the regulator is open, will that destroy the regulator, or if not destroy it, what is the actual problem that develops?

JMOR · Jun 6, 2022

(quoted from post at 15:02:43 06/06/22) If the connecting wire between the main alternator output and pin 2 of the regulator is open, will that destroy the regulator, or if not destroy it, what is the actual problem that develops?

Like most all things in life, it depends.

If an earlier regulator, open sense wire will result in full output all the time, but....in later versions, open sense wire will result in no output.

55 50 Ron · Jun 6, 2022

The one I'm working with is labeled RENARD 35-101-1 3174. I assume the 3174 is a date code of 31st week of 1974 and that would be considered a later version??

used red MN · Jun 6, 2022

So by the numbers your reading it sounds like it is a rebuilt unit or I am assuming you are reading the numbers off the alternator. The change is made in the internal circuits of the regulator, very difficult to assign which way the regulator would default. Rebuilders buy regulators by the cases or they may even have test banks that run the regulator in a test cycle for x hours to determine if they are good or bad. If good they may actually stick them back in a unit to go out the door.

Janicholson · Jun 6, 2022

In the case where it is disconnected, if an early alt it might not affect the regulator itself, but other components may be ruined from over
voltage/charging. If later, it still won't damage the reg. Alternators are current limited by design, and really can't produce more current
(read heat) than designed. So generally they do not have heat related failures. The sense #2 connects best where the battery + cable attaches
to the starter switch/relay/solenoid. This is to get an accurate reading of the real charging voltage at the battery. In the simple wiring of a
farm tractor, there is no real need for that. Jim

JMOR · Jun 6, 2022

(quoted from post at 15:54:11 06/06/22) The one I'm working with is labeled RENARD 35-101-1 3174. I assume the 3174 is a date code of 31st week of 1974 and that would be considered a later version??

asy to determine.....connect voltmeter to output/battery & disconnect Sense #2 and see what voltage does. Reconnect & observe voltage. Usually I can hear the loading/un-loading of the engine with the abrupt change between charging & not.....no voltmeter needed.

55 50 Ron · Jun 6, 2022

The numbers are off the old voltage regulator itself. O'Rielly Auto Parts could get a new one so I ordered one.

Delco 10 SI voltage regulator question

55 50 Ron

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JMOR

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55 50 Ron

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used red MN

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Janicholson

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JMOR

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55 50 Ron

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