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Order Ford 841 Parts Online

Re: Automobile genny on 841 - which VR and coil?

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Author  [Modern View]

03-07-2014 13:44:57

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since I can remember, this forum has reccomended the napa IC14sb round coil for 12v applications.

I see no reason to deviate.

as to your gen / reg situation..

I find it extremely hard to believe you are seeing a closed circuit voltage of 10v in a system with a 6v battery.

IF the gen was making 10v at load. something would have let smoke out long ago!.. thus i suspect your testing or observation procedures are in error.

is it still set up as B circuit?

what does a full field test show you on the ammeter thru a range of rpms from idle on up?

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William Fissell

03-07-2014 14:26:21

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 Re: Automobile genny on 841 - which VR and coil? in reply to soundguy, 03-07-2014 13:44:57  

I kinda agree on the smoke issue. For example, the battery is fried and won't take a charge on the charger. The VR does nothing- ie the contacts aren't chattering, plus bits of the wiring harness had burned/melted through.

I redid the harness and turned it on just.... long... enough.... to....see... 10V...and shut it down right away. Less than 60s.
The 10V was on an old fluke DMM that I have used to troubleshoot my 9N, my Jubilee, and my 600. I'm not really buying this analog-meters-only argument, but I picked up a simpson 260 on fleabay and will try it again with that.

No ammeter on an 841- they substituted a gas gauge. I don't have a clamp-on so I'll have to kludge one up.

I assumed it was a B circuit based on the year but will reconfirm if you tell me how. It def has a 6V regulator.

thanks for the help!

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03-07-2014 15:29:36

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 Re: Automobile genny on 841 - which VR and coil? in reply to William Fissell, 03-07-2014 14:26:21  
I was kinda hopin you had an ammeter int he tool box to toss inline. they are great diagnostic tools. way better than a olt meter or idjit lamp if you can only have 1.

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William Fissell

03-07-2014 16:23:04

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 Re: Automobile genny on 841 - which VR and coil? in reply to soundguy, 03-07-2014 15:29:36  
The genny motored with arm and fld to battery- I think that confirms its a B circuit.

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03-07-2014 16:44:14

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 Re: Automobile genny on 841 - which VR and coil? in reply to William Fissell, 03-07-2014 16:23:04  
generally yes.. however technically it should motor with just arm and case and residuals. but.. with 50ys of dirt and rust. many times it's not smooth enough to do so. ;)

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William Fissell

03-08-2014 08:26:23

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 Re: Automobile genny on 841 - which VR and coil? in reply to soundguy, 03-07-2014 16:44:14  

OK, I have a lot of big black bird (crow) to eat. Turns out y'all were right and using an analog meter DID give me a different answer.

1- measured voltage with engine running about 800 rpm: 6.2V across (fresh) battery terminals. 6.2 V at the arm and at the field terminals of the genny.

2- looped in an old inductive ammeter between bat and battery, full fielded it by jumping arm to field, got the ammeter pinned. (pinned negative, but I probably have the inductive ammeter on backwards). I didn't measure volts because I only had 2 hands and I didn't want to drop my nifty new Simpson 260.

Attached is a photo of the genny.

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