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Ford 9N, 2N & 8N Discussion Forum

6 volt ground

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AL N

10-24-2007 15:24:32

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my 8N is a 6 volt system. First, am I correct that it is a positive ground? If so, why do I get sparks when I try to attach the ground? Help.

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Dunk

10-24-2007 19:26:44

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Re: 6 volt ground in reply to AL N, 10-24-2007 15:24:32

I tried for 30 minutes to figger out how to say something like that and gave up.

You do really good werk here Bob.

NO, I am not kissing arse!!

I mean that, x10!!

That hot guage pressure line says something about the dash being hot.

Or the dash not being grounded. (some how)

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Dunk

10-24-2007 17:17:22

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Re: 6 volt ground in reply to AL N, 10-24-2007 15:24:32

Ugggg, I am gonna have to ponder that one a bit...

I'm not sure I even can.

Look for BIG wires touching something they shouldn't.

That should be might near impossible for the oil pressure guage tube to be the only path to ground for anything, it should at least go thru the oil filter housing and ground first, or the elbo or what ever you call it.

I am at a loss right now.

Or if the dash was hot.

Uggg...

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Bob

10-24-2007 19:01:12

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Re: 6 volt ground in reply to Dunk, 10-24-2007 17:17:22

Here's another thought... Is the "ground strap" from the battery connected to the "dash board support/battery box"?

If so, there may be paint and rust insulating the battery box from the flywheel housing/engine, and the current drawn by the starter MAY be flowing from the dashboard to the engine block/starter using the steel oil gauge tubing as a conductor.

This WOULD NOT be the first instance of that happening, and IIRC, there is a post somewhere in the archives of that very thing happening to someone else!

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AL N

10-24-2007 17:51:07

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Re: 6 volt ground in reply to Dunk, 10-24-2007 17:17:22

I quit for the nite but I think the resistor module is shorted to the dash. I'll let you know what I find tomorrow if you are interested. Thanks for your help.

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Dunk

10-24-2007 16:41:54

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Re: 6 volt ground in reply to AL N, 10-24-2007 15:24:32

My concern would be on where the sparks occurred at the dash.

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AL N

10-24-2007 16:56:17

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Re: 6 volt ground in reply to Dunk, 10-24-2007 16:41:54

I went out and hooked up the battery ground, Holy crap!!!!! No sparks. Turned the key on, pressed the started button and smoke started from the starter relay. I disconnected. I touched the steel tube connector for the oil pressure gage and it burnt my F'in fingers. I mean it was hot. I hope this new info helps. To me it's a dead short, but where I don't have a clue.

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Dunk

10-24-2007 16:32:37

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Re: 6 volt ground in reply to AL N, 10-24-2007 15:24:32

I would say double check all of the wiring, and connections in the area of the dash, the sparks there would say that there is something there touching something it shouldn't, but that is it not hard connected to it.

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AL N

10-24-2007 16:39:16

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Re: 6 volt ground in reply to Dunk, 10-24-2007 16:32:37

I'll check tomorrow, but I thought I was careful when I did the wiring. Are you discounting the VR?

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Dunk

10-24-2007 16:12:19

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Re: 6 volt ground in reply to AL N, 10-24-2007 15:24:32

AL are the sparks like a DEAD short, and destructive?

Or are they like a current draw?

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AL N

10-24-2007 16:23:32

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Re: 6 volt ground in reply to Dunk, 10-24-2007 16:12:19

The hood is off. When I put the ground on one of the cylinder head studs it sparked there and I also saw some sparks coming from the dash area but I couldn't tell where. I was reluctant to do it again for fear of destroying something. So to me it looked like a short.

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Dunk

10-24-2007 15:55:54

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Re: 6 volt ground in reply to AL N, 10-24-2007 15:24:32

Thanks, Bob, I do agree.

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AL N

10-24-2007 16:06:57

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Re: 6 volt ground in reply to Dunk, 10-24-2007 15:55:54

Although it ran fine before I tore it apart, most likely, my problem is with the VR?

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Dunk

10-24-2007 15:47:28

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Re: 6 volt ground in reply to AL N, 10-24-2007 15:24:32

Points in a VR can be stuck together also.

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Dunk

10-24-2007 15:44:36

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Re: 6 volt ground in reply to AL N, 10-24-2007 15:24:32

Cut out on an 8N, Bob?

Before I changed mine to 6v, posi ground, alternator, mine had a genny and a VR.

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Bob

10-24-2007 15:51:48

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Re: 6 volt ground in reply to Dunk, 10-24-2007 15:44:36

I am aware of that. I chose the word "cutout", just in case someone had sneaked one on there PLUS "cutout" is the correct term for one section of the voltage regulator, so I figured, with the use of that word, I had "both bases covered".

(My neighbor has a late (side-mount) 8N that somehow "aquired" a cutout over the years, so you "just NEVER know".)

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Bob

10-24-2007 15:39:35

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Re: 6 volt ground in reply to AL N, 10-24-2007 15:24:32

Positive ground is how it was, originally.

If the electrical system is "as original", the prime suspect would be a stuck "cutout".

You could also have a stuck starter solenoid, or damaged/shorted wiring.

Does it still have a generator? There's a FEW 6-Volt alternators around, and, on the odd chance you have one of those, it could be shorted, or of the opposite polarity.

A LOT can happen to a tractor over about 60 years!

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AL N

10-24-2007 15:49:51

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Re: 6 volt ground in reply to Bob, 10-24-2007 15:39:35

I bought this 8N 22 yrs ago, but burnt oil badly. I rebuilt the engine but haven't put it together until this year. Generator, starter, resistor, and regulator this same, new wiring and key switch.

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Dunk

10-24-2007 15:37:02

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Re: 6 volt ground in reply to AL N, 10-24-2007 15:24:32

Do you have the switch and the lights turned off?

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AL N

10-24-2007 15:53:39

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Re: 6 volt ground in reply to Dunk, 10-24-2007 15:37:02

I bought this 8N 22 yrs ago, but burnt oil badly. I rebuilt the engine but haven't put it together until this year. Generator, starter, resistor, and regulator this same, new wiring and key switch.

No lights. Key switch off

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