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6V Generator Testing Oddities

G

gcg

Member
I just finished putting my "41 9N back together and am testing the generator as well as experimenting with the hi-lo setting because I have lights installed. Still a 6v with cutout and single-wire generator. All lights add up to 83W, 13-14amps.

1. In trying to measure voltage at the battery with engine running, a digital voltmeter readout was jumping all over the place. The analog meter reads about 6v engine off, 8-9v engine running. Is it normal for a digital meter to do this? The meter is working properly as far as I know. "Dirty" power?

2. I"m seeing a difference of 12-15 amps (hard to tell on analog ammeter) with lights off/on - sounds about right.

3. With the lights off, hi-lo screwdriver slot at "12:00", full throttle, ammeter reads 7amps

4. hi-lo at 3:00 13 amps full throttle

5. mid-throttle, 5 and 10 amps at 12:00 and 3:00

So far , I believe all sounds normal and working as expected according to what I"ve read out there....please correct me if you disagree.

But, I"m also trying to confirm that with lights on I have enough output to not drain battery.
When I pull a battery cable at mid or low throttle, with lights off, the engine stays running, since the generator is supplying the power.
You"d think at high throttle I could do this - but the engine dies - whether generator hi-lo is at 12:00 or 3:00. Why would the engine die? I would think at high throttle and hi on generator - the engine would stay running . Lights were off (I hadn"t tried turning them on yet with battery cable off as that would have been the next step)

Any thoughts on the engine dying and the digital multimeter jumping around?

Thanks in advance.
Gary
 
(quoted from post at 21:22:15 10/22/14) I just finished putting my "41 9N back together and am testing the generator as well as experimenting with the hi-lo setting because I have lights installed. Still a 6v with cutout and single-wire generator. All lights add up to 83W, 13-14amps.

1. In trying to measure voltage at the battery with engine running, a digital voltmeter readout was jumping all over the place. The analog meter reads about 6v engine off, 8-9v engine running. Is it normal for a digital meter to do this? The meter is working properly as far as I know. "Dirty" power?

2. I"m seeing a difference of 12-15 amps (hard to tell on analog ammeter) with lights off/on - sounds about right.

3. With the lights off, hi-lo screwdriver slot at "12:00", full throttle, ammeter reads 7amps

4. hi-lo at 3:00 13 amps full throttle

5. mid-throttle, 5 and 10 amps at 12:00 and 3:00

So far , I believe all sounds normal and working as expected according to what I"ve read out there....please correct me if you disagree.

But, I"m also trying to confirm that with lights on I have enough output to not drain battery.
When I pull a battery cable at mid or low throttle, with lights off, the engine stays running, since the generator is supplying the power.
You"d think at high throttle I could do this - but the engine dies - whether generator hi-lo is at 12:00 or 3:00. Why would the engine die? I would think at high throttle and hi on generator - the engine would stay running . Lights were off (I hadn"t tried turning them on yet with battery cable off as that would have been the next step)

Any thoughts on the engine dying and the digital multimeter jumping around?

Thanks in advance.
Gary
Click to expand...

This is what the ammeter is for. If the electrical system is wired properly the ammeter tells you net charge/discharge at the battery.

If you do not see a discharge with the lights on your generator is supplying the full electrical load.

If the ammeter shows a discharge with the lights on the battery is supplying part of the load.

TOH
 
It is normal for a digital meter to be too sensitive.
It is "dirty power". It's an old DC generator.
 
(quoted from post at 22:00:34 10/22/14) It is normal for a digital meter to be too sensitive.
It is "dirty power". It's an old DC generator.
Click to expand...
hat TOH & Royce said, plus that generator can not support that lighting load. 11.5 amperes is it.
 

From what I have heard the idea surrounding the hi-lo switch is that you manually put it on high when you run the lights and switch it to low when you don't so you don't over charge the battery.
Over time the battery will recharge it self since you don't run lights during the day. Unless your tractor laws state you need day time running lights on a tractor.
 
Anyone have a recommendation for how many amps of output I should set the generator for, with lights off - sufficient to run the engine and keep the battery charged without overcharging? I don't want to ruin my new battery.

thanks
 
(quoted from post at 09:51:43 10/23/14) Anyone have a recommendation for how many amps of output I should set the generator for, with lights off - sufficient to run the engine and keep the battery charged without overcharging? I don't want to ruin my new battery.

thanks
Click to expand...

You only have to options Hi or Lo. You pick it.
 
Actually, on this flavor of generator, I have a hi-lo screw I can turn, so it's variable. I believe this flavor came out after the one that only had the hi-lo slider.
 
(quoted from post at 09:22:44 10/23/14) Actually, on this flavor of generator, I have a hi-lo screw I can turn, so it's variable. I believe this flavor came out after the one that only had the hi-lo slider.
Click to expand...
ince you apparently have the 9N10000C with continuously variable hi/lo adjust screw, I would set it just a hair above Zero amps. This, after it has charged long enough to have replaced the starter drain from last start up. Or if want to home in more precisely, set for 7.1 volts on battery after plowing for an hour & engine still running at 1/2 to 3/4 throttle.
 
I have the same setup on my '41 9n. Mine stays on "lo" and runs just fine,with 2-3 amps at about 1000 rpms,then 9-10 at full throttle. The battery stays fully charged even after sitting for a while. lha
 
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