How do you know if an alternator has an internal regular or needs an external regulator.I'm trying to figure out if the one that came with my Cub is correct for the way its set up. Tons of wiring with some being dead ends so I want to clean up the mess. Tractor isn't running so I don't even know if the alternator works.
- Thread starter Charlie M
- Start date
J. Schwiebert
Well-known Member
Early alternators all had external regulators.
In Delco alternators, if the regulator plug is in the rear face of the alternator with the terminals positioned like this [II] in a little square plug, it is an old 10 DN made for ,an external regulator.
If the regulator plug is on the side of the alternator rear housing and had the terminals positioned like this [- -] and is shaped like a long rectangle, It is A SI series with an internal regulator.
If the regulator plug is on the side of the alternator rear housing and had the terminals positioned like this [- -] and is shaped like a long rectangle, It is A SI series with an internal regulator.
Bob M
Well-known Member
If your Cub has a Delco 10SI alternator - the most commonly used alternator conversion - the Jon Hagen's advise below is right on.
However if it's some other mfr's alternator, best to post a photo of the side and rear of it. Someone here will be able to figure it out for you.
However if it's some other mfr's alternator, best to post a photo of the side and rear of it. Someone here will be able to figure it out for you.
old
Well-known Member
- Location
- Camdenton Missouri
Internal regulators did not come out til some time in the mid 70s. Ones like in a 1969 Chev where external VRs but in the late 70s early 80s they had internals ones
Odds are that it is internally regulated, but a dead giveaway to it being externally regulated would be an... external regulator.
On a Cub the old generator regulator was mounted on or next to the original generator, and would have to be removed to accommodate the alternator, even if the previous owner did the world's sloppiest job. So there would be no leftover artifact to confuse things.
On a Cub the old generator regulator was mounted on or next to the original generator, and would have to be removed to accommodate the alternator, even if the previous owner did the world's sloppiest job. So there would be no leftover artifact to confuse things.
Where did you get that info from? First US automotive alternator I know of was in the Ford Model T approx. 100 years ago (no regulator at all). "Modern" alternators up through the 70s mostly all had external and separate regulators. Then internally regulated alternators became popular until on-board computers became the rule. Now many cars and trucks are using external regulators again - with the regulation done by the computer. My 1998 Dodge Grand Caravan has an external regulator.
Lots of Delco one wire conversions out there, easy enough to install- I've done a couple on old generator cars like 1962 Chevy, old Jeep, upgrade on a Nissan- that is internal regulator and a diode in line for exciter. One minor problem is a lot of generator tractor conversions will use a small diameter alternator like the Nissan or the Motorola to fit under hood in place of the generator--and the English Lucas rigs from some of the parts store are positive ground, small diameter and about same mounting plate as a Motorcraft/Ford generator- which wasn't far off from lots of Delco rigs and tuck right into a IHC H, couple early Case models wit no hood cutting. Really need to check what kind of alternator you have. RN
Anonymous-0
Well-known Member
Yes and when that regulator in the computer dies you can simply wire in an old style Mopar electronic regulator instead of replacing the computer.
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