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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

generator /voltage regulator output

Author  [Modern View]
scott@hydrotech

07-25-2010 21:50:40
98.237.17.246



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Can anyone tell me how to check if my 6 volt charging system on my 8N is working correctly. I"m used to 12 volt systems on cars and it"s pretty easy to hook up the meter and see what you"re getting. I hooked up the meter to my running tractor and got +/- 6.25 volts. Then I turned it off and got essentially the same thing. Now what?




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JMOR

07-27-2010 07:32:52
72.190.67.150



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 Re: generator /voltage regulator output in reply to John Ia, 07-25-2010 21:50:40  

teddy52food said: (quoted from post at 09:53:49 07/26/10) Dell, Please explain what gets polarized when you arc spark the wires together. Bob and I and others want to know.


Dell's pliers, barbed wire, whatever.......

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Dave H (MI)

07-26-2010 06:39:45
205.188.116.20



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 Re: generator /voltage regulator output in reply to scott@hydrotech, 07-25-2010 21:50:40  
Listen to what you were told about the meter and polarizing. My experience is with a 2N and a cutout so I hope I don't step in something here. Is your battery going dead on you? Reason I ask is that if you are getting a charge at the genny with the engine off it sounds like you might be leaking voltage backwards and trying to motor the genny. This would be a problem with a cutout or VR I believe...unless I am completely misunderstanding the situation.

When I diagnose a 6v system I hook up my analog meter (either a VOM or portable ammeter, I have both) to the ground and to the genny with the tractor running above idle. Note the voltage or amperage. Then move the genny connection forward thru the system checking EVERY wire and connection as if it were a new component (it is!) until I find where the charge stops. Use a good ground. HTH, Dave.

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lha

07-26-2010 03:38:04
24.176.97.9



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 Re: generator /voltage regulator output in reply to scott@hydrotech, 07-25-2010 21:50:40  
I have a relatively crude '41 9n,and if I worry about charging or not, I check the ammeter for + side needle It only slightly points toward the +,because it's working properly. After warmup,a period of high idling,1 click over minimum,I rev it and voila,it shows a charge.If one time it didn't,I'd get the analog[needle type]meter and check it.After exhausting all tests,take the generator and v-reg to a starter and generator shop and have them tested and/or repaired.Then you'll have a working system.---lha

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36 coupe

07-26-2010 02:48:41
216.220.250.182



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 Re: generator /voltage regulator output in reply to scott@hydrotech, 07-25-2010 21:50:40  
The tractors ammeter will tell you if it charging.



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Dell (WA)

07-26-2010 00:36:26
172.191.205.5



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 Re: generator /voltage regulator output in reply to scott@hydrotech, 07-25-2010 21:50:40  
Scott.......remember, unlike alternators, gennys don't charge at idle. You need about 1/3-throttle. Charging volts across the battery terminals should be about 7.4-volt. Caution: digital meters don't like electrical noise that genny brushes, and sparkies make. (ittza technical thing called sample and hold detector)

Iff'n you don't gitt a satisfactory "charge" voltage, try "re-polarize" yer 8N's squarecan voltage regulator. Just "arc-spark" the side-by-side BAT and ARM terminals, engine OFF. You can re-polarize as many times as it takes to feel warm and fuzzy ...er... charging. .......Dell

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teddy52food

07-26-2010 06:53:49
68.169.216.43



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 Re: generator /voltage regulator output in reply to Dell (WA), 07-26-2010 00:36:26  
Dell, Please explain what gets polarized when you arc spark the wires together. Bob and I and others want to know.



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Dell (WA)

07-26-2010 07:54:55
172.190.108.215



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 Re: generator /voltage regulator output in reply to teddy52food, 07-26-2010 06:53:49  
Teddy.......when you re-polarize you create and "arc-spark" between the the side-by-side BAT and ARM terminals of the 8N squarecan voltage regulator. After all you are SHORTING the BAT to GROUND thru the ARM. And you are "magnetizing" both the genny soft iron core and the ironcore of the cut-out relay inside the squarecan voltage regulator.

You magnetize the iron core of the cut-out relay so it will disconnect when you turn the engine OFF.

It is always recommended to re-polarize ennytime you replace the battery. Why? 'cuz many shadetree mechanics erroneously install the 6-volt battery as negative ground like their 12-volt Belchmobile-V8 with alternator.

Wannna guess what incorrect genny polarity will do to new battery???

Surprizingly enuff gennys don't care positive or negative ground. There are some obscure technical reasons for positive ground (hazzta do with electron attraction of arcing sparkplugs) Modern sparkie material and design have negated that technical advantage.

As I said, you can re-polarize as many times as it takes to feel warm and fuzzy ...er... charging .......Dell

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Bob

07-25-2010 22:05:29
69.178.228.68



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 Re: generator /voltage regulator output in reply to scott@hydrotech, 07-25-2010 21:50:40  
The charging voltage should be about 7.4 Volts.
Doesn't sound like your system is charing.



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scotthydrotech

07-26-2010 19:32:06
98.237.17.246



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 Re: generator /voltage regulator output in reply to Bob, 07-25-2010 22:05:29  
Thanks to all. This sounds pretty easy and fun. I'm using a digital meter, so that's the first problem. The ammeter shows nothing, but the lights don't work either, so I wasn't really relying on the meter as accurate. At the end of the day, the gent I bought it from changed that battery and I think that's where the problem lies. Re-polarizing sounds simple and that's my first hunch to success. you have all been very helpful. Thanks very much! I love this tractor and this community.

Scott

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