alt install...still confused

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TurboRoadster
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alt install...still confused

Postby TurboRoadster » Thu Jan 14, 2016 9:28 am

I have searched and read and still not clear.
If I install a gm one wire, do I still need external regulator and wiring?

If I install a gm 3 wire, Do I do away with the bulky external regulator?

How come I cant find a clear schematic of wiring both types into a factory harness? I know this is a path well trodden before me so i would think the info is here somewhere..I must be searching with wrong key words, heck, I found it difficult to search and find the spark plug gap and points gap. seems simple enough, try it.

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Re: alt install...still confused

Postby Trent M » Thu Jan 14, 2016 9:38 am

Try these from the How To section:

http://farmallcub.com/phpBB2/viewtopic.php?f=140&t=47965

http://farmallcub.com/phpBB2/viewtopic.php?f=140&t=66986

For the simple maintenance and spec stuff, go to the manuals. That info is so easy to find there that there won't be a lot of discussion about them.
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Re: alt install...still confused

Postby TurboRoadster » Thu Jan 14, 2016 9:41 am

I have read both of those, neither explain my questions above.
and the manuals show up on my screen as a bunch of download links which wouldnt be to bad if i knew which one was an index so I can see what page I need to d load. not very user friendly I guess from my end.

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Re: alt install...still confused

Postby Eugene » Thu Jan 14, 2016 9:55 am

TurboRoadster wrote:If I install a gm one wire, do I still need external regulator and wiring?
No.

If I install a gm 3 wire, Do I do away with the bulky external regulator?
Yes.

Both types of alternators have the regulators built in.

Edit: https://www.google.com/search?q=farmall ... lra8mHI%3D Wiring diagram for GM/Delco 3 wire alternator. Schematic is for an M but is the same for a Cub.
Last edited by Eugene on Thu Jan 14, 2016 10:05 am, edited 1 time in total.
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Re: alt install...still confused

Postby ScottyD'sdad » Thu Jan 14, 2016 9:58 am

You don't need the regulator, with either. The one wire wire, goes to the ammeter. Not sure how the 2 wire one is set up.
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Re: alt install...still confused

Postby Don McCombs » Thu Jan 14, 2016 10:06 am

Boss Hog wrote:Hook the wire from the amp gauge that went to the regulator to the lug on the back of the alt. You will also need to switch the wires on the amp gauge to make it show charge instead of discharge, as now it is negative ground and not positive ground
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Re: alt install...still confused

Postby Stanton » Thu Jan 14, 2016 10:31 am

TurboRoadster wrote:...the manuals show up on my screen as a bunch of download links which wouldnt be to bad if i knew which one was an index so I can see what page I need to d load...


Go to "PDF Manuals", then go to "Cub Owners and Operators Manuals" (same as going directly here: http://www.farmallcub.com/[ Sorry, direct links to manual section is not allowed. ]/index.php?dirpath=./files/Cub%20Owners%20and%20Operators%20Manuals&order=0).

That presents you with a list of Owner's manuals from 1947 to 1976. Open the PDF of the manual that is the closest, but next higher year to your Cub. Each PDF contains a complete Owner's manual with index, specifications, recommendations, etc. to operate your tractor. Couldn't be more simpler or user-friendly.
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Re: alt install...still confused

Postby TurboRoadster » Thu Jan 14, 2016 11:32 am

The reason I was asking for a schematic is so that I could tell what is what with my wires and where to connect. the wires behind dash are screwed and botched and i am installing new gauges etc but still dont know what went where on mine due to all the crap wiring there.
I saw the thread where it was mentioned to hook to ammeter and I even read where someone said connect the one wire to the starter lug.
the pdf link helped a lot with other items indeed, thanks!

end result, I still dont know where to wire the gm one wire to. I will go and see if I can identify ammeter wires based on the diagrams in the pdf, maybe that will solve the issue, thanks again!

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Re: alt install...still confused

Postby Eugene » Thu Jan 14, 2016 11:49 am

TurboRoadster wrote:The reason I was asking for a schematic is so that I could tell what is what with my wires and where to connect. the wires behind dash are screwed and botched and i am installing new gauges etc but still dont know what went where on mine due to all the crap wiring there.
Figuring out what was done prior to your tractor purchase is frequently the hardest part of a task.

My suggestion, if the wiring is really messed up, rip it out and and start over. Or you could purchase a wiring harness.

I saw the thread where it was mentioned to hook to ammeter and I even read where someone said connect the one wire to the starter lug.
The wire from the alternator goes first to the amp meter. A wire from the other amp meter terminal goes to the battery lug/terminal at the starter.

I still dont know where to wire the gm one wire to.
See my post directly above.

The wiring diagram and a pictorial of wiring terminal locations are contained in the operator's manual. See Stanton's link in an above post.
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Re: alt install...still confused

Postby TurboRoadster » Thu Jan 14, 2016 12:48 pm

Eugene wrote:Figuring out what was done prior to your tractor purchase is frequently the hardest part of a task.

My suggestion, if the wiring is really messed up, rip it out and and start over. Or you could purchase a wiring harness.



I know thats right, I might just snap a picture behind the dash to show the mindset of folks...dunno why it would ever be bastardized like this :tractor:

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Re: alt install...still confused

Postby Matt Kirsch » Thu Jan 14, 2016 12:58 pm

To tie into the existing wiring harness with a GM 1-wire alternator, assuming factory wiring in good condition:

Take the BAT and L wires off the original regulator. Attach them both to the BAT post of the alternator. Discard the two short wires that ran between the old generator and regulator.

That's it.

The reason there is no schematic for this is:
A. It's so simple.
B. The original wiring is generally a mess, so people usually rewire the system.

You can't avoid having to run a wire for a 3-wire alternator. In addition to the above, you need to run a wire from the ignition switch post of your ballast resistor (or 12V coil), through a diode, to the #1 terminal on the alternator. You also need to run a short wire from the BAT terminal on the alternator to the #2 terminal on the alternator.

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Re: alt install...still confused

Postby Smokeycub » Fri Jan 15, 2016 1:10 pm

ScottyD'sdad wrote:The one wire wire, goes to the ammeter. Not sure how the 2 wire one is set up

The small wire on a three wire setup is a voltage sensing wire for the internal regulator. The further away from the alternator the better job it does sensing battery voltage which is what it's supposed to do, due to voltage drop the further away from the alternator it's connected. While it does make a difference how far it is from the alternator it's not a huge difference. That said, some people have connected it to the BAT terminal on the alternator essentially making it a two wire unit, a BAT and an ignition lead.
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