Delco one wire

grandpa Love · Apr 10, 2022

I need a parts number for a Delco one wire alternator. Me and the parts guy looked up several '70-80s Chevy truck alternators and they all had a plug on them too. Thanks

RCP · Apr 10, 2022

I prefer the mini alternators, I find them easier to mount and keep under hoods and sideshields. Here is an example;
Mini

warbaby · Apr 10, 2022

Any GM alternator with a designation that ends in ''SI'' (self exciting) will do- its all in the internal regulator. Put one of these regulators in a standard GM alternator an you will then have a ''one wire'' unit.
one wire regulator

Janicholson · Apr 10, 2022

One wires (of any design or model number) are remanufactured, or new, alternators made from standard castings. The attachment plug in is going to be there no matter what. In some, there is a plastic insert covering the hole, but not always. The voltage regulator inside is what is modified. The modification is to wire a exciter voltage from the output to the VR #1 terminal circuit through a added resistor. Or to design a new VR with that built in. This causes to minor drain all the time in a one wire setup. So that is why I suggest a 3 wire. One directly to the big output post 6 inches long from the #2 terminal, and one through a diode small marker lamp, or 10 ohm 10 watt resistor to the ignition circuit at the on off switch, or the coil input or ballast resistor input as convenient. Jim

miangus · Apr 10, 2022

All those trucks would have had a three wire. Actually its the regulator that is one wire. You can install a one wire regulator in the alternators you were looking at. I prefer the three wire. I replaced the one wire regulator in the alternator on my 400 with a three wire and a light. A one wire is just self excited. I have had bad luck with the one wire alternators

Steve@Advance · Apr 10, 2022

I don't know of any automotive application for a 1 wire. That's why it can't be looked up by application.

They are all aftermarket. Best to buy it online, probably save a bunch of money too!

warbaby · Apr 10, 2022

NO, NO! Forget that. ''SI'' on the Alternator designation means ''System Integrated''! GM speak for an alternator with a internal regulator. You need one designated ''SE''. That designation means ''Self Excited''.

A condition I sometimes experience myself...

44 massey · Apr 10, 2022

One problem some people run into with one-wire is, depending on application, they wont self energize unless rev up the motor when you first start it then they are ok!!!

SDE · Apr 10, 2022

I had an alternator that I made the pulley smaller so that it would excite itself at a less than full throttle speed. Which might be a problem that you will have with a small hp engine.

caterpillar guy · Apr 10, 2022

A 3 wire is not difficult to use and solves all that nonsense about whether it will excite or not. A simple wire to the ign switch solves all the foolishness of discharging. You have to shut the tractor off anyway.

Traditional Farmer · Apr 10, 2022

Go to the DB Electric website they'll have what you need I'm running about ten of them.Start charging as soon as I fire up the tractor and will NOT run the battery down while sitting.

AZglide · Apr 10, 2022

Dont remember all the digits but the NAPA number will be 213-XXXXSW. SW identifies it as a single wire. Even the least experienced counter guy should be able to find one on the shelf even if they dont understand what its for.

stevieb49829 · Apr 10, 2022

Kevin, get a 3 wire, and I'll send you a diode. I wired mine right to the ignition switch side of the coil. It was about 10 inches of wire. Then the jumper wire I spliced into the Output wire. That was about 3 inches of wire with a spade plug on the end. Charges instantly to about 14V. And this is an old, used Chevy truck alternator. steve

john in la · Apr 10, 2022

There is no such thing as a Delco one wire alternator in an automotive OEM application.
To find an OEM one wire alternator you need to look under marine applications.

Lots of places sell the 3 wire alternator and call it a 1 wire.
Some might even put a little black plug where the 2 wires go.
They live on the fact a 3 wire will self excite given enough RPM's.

If you really need a 1 wire alternator do like TF said and order it from DB Electrical.
They have a automotive alternator with a marine regulator in it and the wide 5/8 pully most tractors need.
Gona cost you about $100 but its not a bad price considering it is new and not some rebuilt stuff you will find somewhere else.

Fred Werring · Apr 10, 2022

Link below is to DB electrical 1 wire.

I prefer 3 wire myself with the idiot light...'cause some idiots (raises hand here) like to run the carb dry on occasion, and the light lets me know the key is still on.

3 wire 10si on ebay from DB

https://www.ebay.com/itm/DB-Electrical-ADR0151-Alternator-10SI-63A-3-00-OClock-/153177944879
DB

AZglide · Apr 10, 2022

Here you go. If the picture doesnt show up its part number 213-4011SW. Product specs are in the description.

chcase · Apr 10, 2022

Kevin,It depends what you want to put it on. If you have lots of room then one from napa (213-4011sw )or one from db electrical.If you can find someone who does it has a hobby they can help steer you in the right direction.Not sure of the size limits on your cubs but there is also smaller diameters out there.

Ozlander · Apr 10, 2022

(quoted from post at 07:31:22 04/10/22) I need a parts number for a Delco one wire alternator. Me and the parts guy looked up several '70-80s Chevy truck alternators and they all had a plug on them too. Thanks

You need to find on with the same belt size as on the tractor.

Jim.ME · Apr 10, 2022

You need to find on with the same belt size as on the tractor.[/quote]

The pulley from a Delco Remy generator will usually go right on a Delco style alternator so you may be able to just swap the pulleys. If you can find one the right belt width with a smaller diameter than the generator pulley that is a plus. A smaller OD pulley increases alternator rpms for a given engine speed.

grayrider · Apr 10, 2022

Delco 10SI

old · Apr 10, 2022

The Delco 1 wire is a modified delco 10si and was not as such made by Delco but was an aftermarket set up but if yo uhave a good parts person at O'Reilly's they can fid them I know I have gotten more then one from them but prefer the 3 wire since they don't run the battery down over time

buickanddeere · Apr 10, 2022

(quoted from post at 08:31:22 04/10/22) I need a parts number for a Delco one wire alternator. Me and the parts guy looked up several '70-80s Chevy truck alternators and they all had a plug on them too. Thanks

Why do people persist in fooling around with one wire alternators . When they can install a proper three wire alternator . It is not complicated or difficult .

Novanut · Apr 10, 2022

Grandpa Love, the part number for a GM 1 wire alternator is DL7140m at Autozone.

Traditional Farmer · Apr 10, 2022

Because its less trouble and works just as well as a 3 wire,given the choice I'll take a 1 wire every time especially with a diesel.Of course my tractors are workers and I ran off the Correct Police years ago.

Traditional Farmer · Apr 10, 2022

The one wire ones from DB don't either,just cranked my David Brown 780 with a 1 wore alternator this last week that had been sitting with the battery in it since October.Fired right up.

old · Apr 10, 2022

your one of the few lucky ones

Traditional Farmer · Apr 10, 2022

Not luck its the difference in how they are built I guess because none of mine run the battery down.Of course a weak battery will discharge over time by itself.

buickanddeere · Apr 11, 2022

(quoted from post at 00:00:51 04/11/22) Because its less trouble and works just as well as a 3 wire,given the choice I'll take a 1 wire every time especially with a diesel.Of course my tractors are workers and I ran off the Correct Police years ago.

Wiring in a diode or wiring excitation to a switched terminal IS NOT difficult . Why have the regulator slowly discharging the battery?

grandpa Love · Apr 11, 2022

I've done a dozen at least..... It's
not difficult, just wanted to try a one
wire..

JMOR · Apr 11, 2022

Lot of replies here, some worthy of space, some not so much.
Delco Remy DID make a one wire alternator, however, the key words were that it was not factory installed on GM cars. 10SI series, 116 Type, one wire system. Completely detailed in Service Bulletin 1G-277. Someone will need to prove that their one wire alt, wired as a one wire has ZERO drain when not running, because I don't believe it. It can be so small (microamperes) at to not be noticed or detected by some, but it is there. P.S., it is also there on factory installed 3-wire 10SI alternators. This is so small the a simple calculation shows 9 years to totally drain a 66 A-H battery. Battery self discharge will probably kill it before the alternator drain does. It does illustrate why why some folks incorrectly insist that their alt does not have a battery drain when in use and also why a battery disconnect is not needed.

BarnyardEngineering · Apr 11, 2022

I've got two one-wire alternators, both on Farmall Super M's. One will run a new Group 31 battery down in a week. The other can sit for months and fires right up.

I've also got a 10SI 3-wire on one farmall 400 that three alternators have failed on. I've got the same setup on another 400 that's still on its first alternator.

JMOR · Apr 11, 2022

(quoted from post at 13:49:09 04/11/22) I've got two one-wire alternators, both on Farmall Super M's. One will run a new Group 31 battery down in a week. The other can sit for months and fires right up.

I've also got a 10SI 3-wire on one farmall 400 that three alternators have failed on. I've got the same setup on another 400 that's still on its first alternator.

potato isn't always a potato :roll:

Tracy Brown · Apr 11, 2022

Delco one wire

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