12 volt cub

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john2189
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12 volt cub

Postby john2189 » Mon Jun 19, 2017 9:38 am

Why doesn't my ammeter show that is charging or discharging? it always stays on zero,it never moves. That battery never goes dead, so it must be charging. It has a mag, so pulling a battery cable wont tell me. one wire nippendeso alternator
Is my gauge bad?
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John
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Re: 12 volt cub

Postby Urbish » Mon Jun 19, 2017 9:44 am

Ammeter could be wired wrong (so that there is no power going through it) or the gauge could be dead. Have you tried swapping your ammeter with a known good one? Otherwise, you could disconnect the wire from one side of your ammeter and put a multimeter in between the ammeter lug and the wire you took off.

EDIT: Is it a 10 or 15 amp gauge? Sometimes people put automotive ammeters (60 or 100A range) on without realizing that the piddly charge from a Cub isn't enough to register.

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Re: 12 volt cub

Postby john2189 » Mon Jun 19, 2017 10:00 am

IM not sure what amp the gauge is. Couldnt I put the multi meter at a disconnected battery post ?
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Re: 12 volt cub

Postby BIGHOSS » Mon Jun 19, 2017 10:03 am

Quick and easy check. Check positive and negative post on battery not running with multi-meter. Should be around 12 volts. Start tractor. With about 2/3 throttle, check battery posts again. If more than 12 volts, it's charging. If no change or a little less, not charging.
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Re: 12 volt cub

Postby john2189 » Mon Jun 19, 2017 10:08 am

Thanks Bighoss Ill try that.
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Re: 12 volt cub

Postby tst » Mon Jun 19, 2017 10:31 am

seeing how you have an alternator it should at the very least read around 13.5 volts and up to 14.5 is nice, do you have lights? with the engine off turn the lights on and the amp gauge should read a discharge

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Re: 12 volt cub

Postby john2189 » Mon Jun 19, 2017 11:22 am

no, I do not have lights
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Re: 12 volt cub

Postby bofahs » Mon Jun 19, 2017 12:09 pm

Urbish wrote:Ammeter could be wired wrong (so that there is no power going through it) or the gauge could be dead. Have you tried swapping your ammeter with a known good one? Otherwise, you could disconnect the wire from one side of your ammeter and put a multimeter in between the ammeter lug and the wire you took off.

EDIT: Is it a 10 or 15 amp gauge? Sometimes people put automotive ammeters (60 or 100A range) on without realizing that the piddly charge from a Cub isn't enough to register.


Heartily concur. Went to Advance Auto and got a 60A ammeter - nearly imperceptible twitch, even with lights and IGN on.

Wiring - the ONLY wire on the POS side of the ammeter should be from the POS terminal of the battery. Everything else - the Ignition AND the charging (and lights if you get them) should be on the NEG terminal of the ammeter.

With the Mini-Alternator 12180, running, I get 14.7V at the battery. So happy!

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Re: 12 volt cub

Postby Glen » Mon Jun 19, 2017 5:12 pm

Hi,
You didn't say what year the Cub is.
If this is a 6 volt Cub that has been converted to 12 volts, the ammeter might not be connected.
I would look behind it with a light and see if there are wires connected to both terminals on it, if there is, then it could be wired wrong, or the ammeter has quit. :)

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Re: 12 volt cub

Postby ntrenn » Mon Jun 19, 2017 6:01 pm

You would be amazed at how little charge it takes to keep the battery up....especially with a mag and no lights. Mine usually only charge for a few minutes and the battery is topped up. I would put money on the way an alternator works vs a generator. It will hold voltage up but current may be just a trickle....main reason alternators normally use a voltmeter instead of an ammeter....plus wiring is cheaper..

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Re: 12 volt cub

Postby john2189 » Mon Jun 19, 2017 9:11 pm

Glen, its a 49 on 12 volts

ntrenn , I will check voltage next chance I get
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Re: 12 volt cub

Postby Crimson Tim » Thu Jun 22, 2017 7:19 pm

bofahs wrote:
Urbish wrote:EDIT: Is it a 10 or 15 amp gauge? Sometimes people put automotive ammeters (60 or 100A range) on without realizing that the piddly charge from a Cub isn't enough to register.


Heartily concur. Went to Advance Auto and got a 60A ammeter - nearly imperceptible twitch, even with lights and IGN on.



Does this hold true with a late (1977) Cub of unknown alternator?
TM tractor supply has three ammeters. An early one to 20 A, an early fifties one to 20 A, and a later 50s one that just shows charge and discharge. No clarification there on what a 77 would have. I guess this latter one, because the owners manual shows a gauge with just + and - on it with no numbers. Did the range stay the same at 20 amp through the 70s?
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Re: 12 volt cub

Postby tst » Thu Jun 22, 2017 7:54 pm

the later ones were set up to 60 amps with the alternator

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Re: 12 volt cub

Postby Crimson Tim » Thu Jun 22, 2017 8:35 pm

tst wrote:the later ones were set up to 60 amps with the alternator


Really? Good. Then as long as my gauge isn't dead, I should be good to go once I sort the birdsnest of PO wiring "fixes". (Like why is the alternator on a switch? Never mind. Question for another post.) Thanks!

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Re: 12 volt cub

Postby Glen » Thu Jun 22, 2017 9:23 pm

Hi,
Here is a pic of an IH, Delco alternator on a 76 Cub, it was in a recent post on here. It looks like this from the factory. The model number of the alt should be under the lower right side, stamped near the mounting bolt, if it is an original style alt. The amp output is stamped there too, 37A, 42A, etc. Use a light and you should be able to see the numbers.
Here is a page from the Cub service manual showing the Delco alt number, it was a 1100578, it says that one was 37 amps. :)

http://www.farmallcub.info/manuals/gss- ... 009-02.jpg
Attachments
Cub alt 76 Cub.JPG


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