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Re: Alternator Question

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08-23-2013 19:30:56

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Based off one wire diagram I found, I ran the wire from the bat terminal on the alternator straight to the ammeter and then to the battery out the other side of the gauge. The gauge needle wasn't moving at all and I believe there was no current coming out the other side going to the battery. I bypassed the ammeter and ran that wire straight to the battery and after running for a couple minutes, I shut the tractor off and it started back up without jumper cables. I bought a new ammeter tonight and will install it another day.

I would like to put together a correct diagram for those with TO20s running a 3 wire alternator and 12v coil with an ammeter and charge light. I'm attaching a diagram that I will correct as I'm given advice. Please look at it and tell me what is wrong with it as is. Then please tell me where to put the ammeter and the charge indicator light. Maybe we can get a good one to post.

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08-24-2013 09:18:39

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 Re: Alternator Question in reply to jcmorgan31, 08-23-2013 19:30:56  

Please excuse my poor revision of your drawing (if you wanna call it that-its ben a few years since I had to draw something up) this may give you some ideas. Remember to power any accessories from some where on the alt side of the ammeter.use 10 gauge wire for any circuits that carry a heavy load , and that the ammeter is big enough to carry the amperage of the alternator.

I hope this helps. If you like my # is 918-485-3567 Mr Bill

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08-24-2013 20:55:32

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 Re: Alternator Question in reply to oldmisterbill, 08-24-2013 09:18:39  
Boy I screwed this up. I didn't pay close attention to the IGN coil & dist at top (hard for me to see the print.I was mistaken the IGN switch at the bottom for "ign coil" My apology. So I drew it with 2 ign switches.

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08-24-2013 13:40:06

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 Re: Alternator Question in reply to oldmisterbill, 08-24-2013 09:18:39  
This connection would give you a net reading ammeter.


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08-24-2013 07:55:06

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 Re: Alternator Question in reply to jcmorgan31, 08-23-2013 19:30:56  
By the way which program did you use to make this diagram? I need to learn to do this it would help immensely.

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08-24-2013 07:52:32

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 Re: Alternator Question in reply to jcmorgan31, 08-23-2013 19:30:56  
I hope I can say all this without being too long winded. 1. An ammeter is a limited help in monitoring the charging system. It's kinda outdated for this purpose. But I will try to shed some light on its proper use. Basically an ammeter indicates how much current (ampere not necessarily volts) are traveling and what direction they are traveling through a wire or circuit. In other words an ammeter hooked up backwards could fool you into thing a battery is charging (electricity flowing to the battery ) or discharging (current flowing away from the battery).In other words if I hook an ammeter backwards in a system that is working correctly it would show the battery as discharging ,while it was actually charging. if the ammeter is between the generator or alternator, and big lug that all the wires go on it will only show if the alternator is putting out so many amps. If the ammeter is placed between the battery and the terminal that all the accessories are on (lights -ignition -whatever)BUT NOT THE starter. It will indicate whether the battery is getting charged or discharged by the charging source. Remember the ammeter is only equivalent to about a 10 gauge wire.

In your diagram I would use at least 10ga wire from the batt side of the alternator to the power side of the ign switch then another 10ga wire from the switch power side to the ammeter then on to the starter switch. this way the ammeter is indicating the current to the battery (which will include what the alternator puts out) as well as tell if the alt output is enough to carry all the accessories. Remember if the ammeter reads wrong it sould be hooked up backwards - it would still run & charge but indicate a discharge equivalent to what it is charging.

Personally I prefer a volt meter.

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