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Ammeter wired backwards
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Ammeter wired backwards
When I turn on headlights before starting tractor, ammeter shows charge rather than discharge. Ammeter shows discharge when tractor is running. I pulled the hood off this weekend and it looks like if the ammeter is wired backwards it has been that way for a LONG time. The regulator to generator wiring is correct and the wire from the harness does go to the starter motor terminal. I would say that the generator being polarized backwards could be an issue, but the headlights casusing charge rather than discharge before start tractor proves ammeter is simply wired backwards. Thoughts?
- randallc
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Re: Ammeter wired backwards
Certainly sounds like it is wired backwards. This should provide some assistance. I don't know that having it wired backwards will affect anything but which direction the gage goes, I'm sure others know.
- Bus Driver
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Re: Ammeter wired backwards
Need more information. Is your system 6 volts or 12? What is the year of your tractor ( the statistical chances are that it is 1960 or earlier)? Is the charging unit a generator or an alternator? Which battery post is grounded, positive or negative?
This information will provide clues as to how this situation occurred.
If all that is too much to ask, the cure probably is to swap all the wires from one side to the other on the ammeter.
This information will provide clues as to how this situation occurred.
If all that is too much to ask, the cure probably is to swap all the wires from one side to the other on the ammeter.
Luck favors those who are prepared
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Re: Ammeter wired backwards
Just swap the wires on the ammeter.
When converting from a 6 volt to a 12 volt system this will happen if you do not swap the wires on the gauge. Not knowing if this is the case....I would swap the wires. It is simply "flowing" thru the gauge.
I think that would solve your issue.
When converting from a 6 volt to a 12 volt system this will happen if you do not swap the wires on the gauge. Not knowing if this is the case....I would swap the wires. It is simply "flowing" thru the gauge.
I think that would solve your issue.
"I ain't believing this!"
- Bus Driver
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Re: Ammeter wired backwards
One of the reasons for the questions is that the described backward reading ammeter could be caused if the 6 volt battery is installed with the negative grounded, then the generator is polarized. Moving the wires on the ammeter in that case deals with the symptoms only.
If a generator regulator is built for a specific polarity, and some are, it will work on the opposite polarity but the point life is significantly reduced.
If a generator regulator is built for a specific polarity, and some are, it will work on the opposite polarity but the point life is significantly reduced.
Luck favors those who are prepared
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- 10+ Years
- Posts: 27
- Joined: Tue Oct 08, 2013 9:34 pm
- Zip Code: 78932
- Tractors Owned: 1957 Cub
1958 Ford 641
1953 Ford Jubilee
2007 Cub Cadet - Circle of Safety: Y
- Location: Carmine, TX
Re: Ammeter wired backwards
It's a 57 with original 6 volt positive ground and generator. It was this way when I bought it and suspect it has been for a long time. Perhaps originally
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Re: Ammeter wired backwards
Original wiring also. Could the battery be installed backwards and still work?
- pickerandsinger
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Re: Ammeter wired backwards
If your tractor has no issues with keeping the battery charged, I would say just swap the wires as has been mentioned...If it does not keep the battery charged you need to investigate further....Dave
In Memory of 58,286
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- 10+ Years
- Posts: 27
- Joined: Tue Oct 08, 2013 9:34 pm
- Zip Code: 78932
- Tractors Owned: 1957 Cub
1958 Ford 641
1953 Ford Jubilee
2007 Cub Cadet - Circle of Safety: Y
- Location: Carmine, TX
Re: Ammeter wired backwards
I probably answered my own question. These 6 volt batteries are probably symmetric. The starter doesn't care, nor core, regulator, or lights. That's how you do a 12 volt neg conversion with alternator conversion.
- John *.?-!.* cub owner
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Re: Ammeter wired backwards
I would also buy or borrow a voltmeter and check the polarity of the battery. They can be charged backwards resulting in the + term actually being negative etc. This would also give the same results. I learned that in 69 or 70 trying to figure out why the radio wouldn't work in a late 50s or early 60s Chevy (don't remember exact year). Kid had taken battery out to take to the field and jump start a Farmall M that was dead. When he reinstalled it, somehow along the line the generator became polarized the wrong way, and he made a long trip in it . No ammeter, only an idiot light, and he never knew anything was wrong, it had enough running time to discharge the battery and recharge it in reverse polarity. The only noticeable problem was the radio would not work. He brought the radio to the shop twice and I could find nothing wrong with it until he finally brought the vehicle in, and as son as I hoked a volt meter to it I saw why the radio would not work. I told him to leave the lights on that night and run the battery down then to recharge the battery with a charger, and showed him how to polarize the generator afterward. All was well afterward, but i do not think the battery lasted as long as normal afterward.
If you are not part of the solution,
you are part of the problem!!!
you are part of the problem!!!
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- 10+ Years
- Posts: 27
- Joined: Tue Oct 08, 2013 9:34 pm
- Zip Code: 78932
- Tractors Owned: 1957 Cub
1958 Ford 641
1953 Ford Jubilee
2007 Cub Cadet - Circle of Safety: Y
- Location: Carmine, TX
Re: Ammeter wired backwards
I'm anxious to check the polarity of the battery, but alas it is out at the farm and won't be able until this weekend. I assumed that the previous owner had hooked up the new battery correctly. Obviously not a good assumption. Thanks for everyone's suggestions.
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Re: Ammeter wired backwards
Astrowing wrote: I assumed that the previous owner had hooked up the new battery correctly. Obviously not a good assumption.
Unfortunately not, as not everyone has experienced a vehicle wired positive earth. I only know about it because my first car was older than I was.
Michael Cummings
Eddie - a 1959 International Lo-Boy named after my father in law, who who bought her new.
Eddie - a 1959 International Lo-Boy named after my father in law, who who bought her new.
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- 10+ Years
- Posts: 27
- Joined: Tue Oct 08, 2013 9:34 pm
- Zip Code: 78932
- Tractors Owned: 1957 Cub
1958 Ford 641
1953 Ford Jubilee
2007 Cub Cadet - Circle of Safety: Y
- Location: Carmine, TX
Re: Ammeter wired backwards
The battery is wired correctly, but is reverse polarized. I was surprised when I put my voltmeter on it. Ive never seen this before myself. Tried to run the battery down and then recharge with correct polarity but didnt work. ive got a new battery installed and will repolarize the generator before restarting.
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Re: Ammeter wired backwards
That will be a good approach and everything should work normally after you do that. When correcting the polarity of the old battery, it needs to be drained absolutely dead. Connect a load across it, such as a light bulb, and drain till you see no sign of life, then leave it connected for another day. Once it,s totally dead you should be able to charge it the proper way.
- pickerandsinger
- 10+ Years
- Posts: 1501
- Joined: Thu Oct 18, 2012 3:23 pm
- Zip Code: 13143
- Tractors Owned: 1957 Cub Low Boy w/ FH Mott Flail Mower
1953 Cub w/ sprayer and 54A blade (Chompers)
1954 Cub w/fast hitch (Ira)
1948 Cub ( Papa Paul)with Henderson loader..
1951 Mutt mix Cub (BattleAx
1950 Farmall Cub (basket case demo)
Cub parts tractor
2019 " KuB"ota 2601 loader and roto tiller
1951 Ferguson TEA 20 (parts)( Uncle Rusty)
F/H Disc Harrow for cub L-38
C-22 Sickle Bar Mower
IH C2 and C3 mower
Universal tool attachment with disc hillers..Rear cultivators (various tips
York Rake for Cub home made
Single bottom Plow for Cub F194
Gravely 5660 12 hp/ w snoblower.rototiller,bush hog - Circle of Safety: Y
Re: Ammeter wired backwards
There's one for the old memory bank...Gary Dotson wrote:That will be a good approach and everything should work normally after you do that. When correcting the polarity of the old battery, it needs to be drained absolutely dead. Connect a load across it, such as a light bulb, and drain till you see no sign of life, then leave it connected for another day. Once it,s totally dead you should be able to charge it the proper way.
In Memory of 58,286
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