Bill Bowen
Member
My M came with a alternater but ampmeter dosen't move.The wireing harness looks a mess.Where would best place to check alt.,at battery or alt itself.Thanks Bill
- Thread starter Bill Bowen
- Start date
Check at the BATTERY when shes just setting there NOT running a good battery ought to read around 12.6 volts subject to temperature and its state of charge. If running and hooked to a good alternator it should rise from at least 13 to 14.5 or so and over depending on RPM, battery condition, belt tightness and pulley sizes, and the alternator and its voltage regulator BUT IT NEEDS TO RISE IN VOLTAGE TO INDICATE CHARGING
For an ammeter to effectivley register the current into CHARGING the battery or out of DISCHARGING the battery, the battery (often where big cable attaches to starter switch) must be connected to the SUPPLY side of the ammeter while the output of the alternator, plus loads likes lights and ignition, must be connectted over on the other LOAD side of the meter. Ive seen guys mistakenly wire the alternator to the battery side and that way the ammeter dont register its charging.
John T
For an ammeter to effectivley register the current into CHARGING the battery or out of DISCHARGING the battery, the battery (often where big cable attaches to starter switch) must be connected to the SUPPLY side of the ammeter while the output of the alternator, plus loads likes lights and ignition, must be connectted over on the other LOAD side of the meter. Ive seen guys mistakenly wire the alternator to the battery side and that way the ammeter dont register its charging.
John T
Janicholson
Well-known Member
These should help.
I will add to John T's idea that many one wire systems are hooked directly to the battery terminal at the starter switch and thus bypass all but one wire in the electrical system. Not recommended. Jim
Bob Ms diagrams for Farmall Letter
I will add to John T's idea that many one wire systems are hooked directly to the battery terminal at the starter switch and thus bypass all but one wire in the electrical system. Not recommended. Jim
Bob Ms diagrams for Farmall Letter
Like John T said, but in less words. Measure the battery voltage not running should be 12.6 volts, running should be 14 or higher. You are fine if that is the case.
My dad always said, take care of the voltage and the current will take care of itself. I think too many people worry if the amp gauge is showing enough.
My dad always said, take care of the voltage and the current will take care of itself. I think too many people worry if the amp gauge is showing enough.
Janicholson
Well-known Member
David you are correct. A good alternator on a good battery with full charge will stay so close to Zero that many think there is no charging going on. If it moves when the lights are on and the tractor is not running, or shows 5 amp charge for a minute after starting it is probably OK. Jim
John M
Well-known Member
- Location
- Nunyafn business
If the wiring is a mess, Id just take the alt off and have it checked. if the wiring is a mess, chances are the alts toasted, and you can pick up a new one while you there.
Bill Bowen
Member
Thanks, went to the diagram link.Would the Super H/M 12 volt conversion be the same for M with bat ignition.Bill
Janicholson
Well-known Member
Yes Mag tractors are different
Type in Janicholson Mag to find a diagram for mag tractors. Jim
Type in Janicholson Mag to find a diagram for mag tractors. Jim
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