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

Voltage Regulator internals

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Greg in SC

08-08-2014 16:18:05
69.160.179.213



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First I would like to thank all the help I have received on this forum. I had to replace a head gasket and in the process I discovered a bent exhaust valve. I replaced the valve, guide, spring, and keepers. I also replaced the original tappet with an adjustable tappet. I had to make a tappet holding tool so I could adjust it. I had a cracked distributor cap so I went ahead and replaced the points, rotor, cap, and plug wires. I also cleaned the carburetor. After all that it cranked and ran better than it has in years! I could not have done this without postings and searches of the forums.

Now I want to understand how the internals of the voltage regulator works. I have a 49 front mount 6v system with the 8n100000B generator (non adjustable). It is wired correctly (I ohmed this out with wires disconnected - also made sure no shorts within the harness by ohming between the wires). With the VR cover off, I observed the 2 relays. What is the function of each and when is each on supposed to activate? I also noticed there is a 20 ohm resistor (approx.) on the underside of the regulator. What is it for? I have a new battery and it reads 6.3 volts when not running. I don't think it is charging because when running I have 6.4 volts at the battery. The generator "motors" with the belt removed and hooked up to act as a motor so I think it works. Since I don't understand how the VR works, it limits my troubleshooting. any help would be appreciated. Thanks.

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Greg in SC

08-09-2014 05:48:22
69.160.179.200



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 Re: Voltage Regulator internals in reply to Guardian3, 08-08-2014 16:18:05  
Quoting Removed, click Modern View to see I don't know either, but I poured gas on top of all valves to make sure they were sealing and this one wasn't. I took it out (these are probably originals since they had the old "FoMoC" logo on top of each valve). So I removed it (very difficult) and thought it looked slightly bent so I chucked it up in a drill and it wobbled. Bought new valve, lapped it and it sealed against the seat. Maybe it fatigued over time, maybe it got stuck once in the guide, maybe, maybe,maybe..... I have no explanation, but it just wouldn't seal. These are older valves that you had to grind to get the correct clearance but I replaced it with non-rotating type valve and adjustable tappet. Good point but I have no clue as to why it was bent.

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TheOldHokie

08-09-2014 05:58:08
71.176.182.141



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 Re: Voltage Regulator internals in reply to Greg in SC, 08-09-2014 05:48:22  
Quoting Removed, click Modern View to see

I would imagine a foreign object that gets trapped between head and seat can bend it.

TOH



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Bob

08-08-2014 21:17:59
64.255.159.192



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 Re: Voltage Regulator internals in reply to Greg in SC, 08-08-2014 16:18:05  
You may think how a VR functions is a MYSTERY... It is an even BIGGER mystery how an exhaust valve would get bent on a Ford "flatty"!



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Greg in SC

08-08-2014 17:44:00
69.160.179.213



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 Re: Voltage Regulator internals in reply to Phil9N3667, 08-08-2014 16:18:05  
Thanks. Its raining tonight and I will be visiting family in Atlanta until middle of next week, but I'll check VR operation later and post back. This is a big help.



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FLAcharlie

08-08-2014 17:31:41
75.91.87.24



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 Re: Voltage Regulator internals in reply to Greg in SC, 08-08-2014 16:18:05  
google "how does a voltage regulator work on a tractor" Get the PDF "Instructions for Testing and Installing a Voltage Regulator fo.....", that looks like it might be helpful.



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JMOR

08-08-2014 17:22:42
72.181.173.171



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 Re: Voltage Regulator internals in reply to Greg in SC, 08-08-2014 16:18:05  
Quoting Removed, click Modern View to see



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Greg in SC

08-08-2014 17:17:38
69.160.179.213



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 Re: Voltage Regulator internals in reply to soundguy, 08-08-2014 16:18:05  
Thanks. I read that twice. I will have to read it several more times to fully digest it (wife says I'm slow on the uptake sometimes). The VR does more than I thought.



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FLAcharlie

08-08-2014 17:19:31
75.91.87.24



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 Re: Voltage Regulator internals in reply to Greg in SC, 08-08-2014 17:17:38  
can't help more, I have one of those new-fangled 12V alternator setups.



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Bruce (VA)

08-08-2014 17:17:23
24.125.183.11



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 Re: Voltage Regulator internals in reply to Greg in SC, 08-08-2014 16:18:05  

I can't argue w/ the explanation in the link FLAcharlie posted.

The flow chart will help you diagnose the problem.



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FLAcharlie

08-08-2014 17:02:10
75.91.87.24



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 Re: Voltage Regulator internals in reply to Greg in SC, 08-08-2014 16:18:05  
This post may be helpful



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