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Ford 9N, 2N & 8N Discussion Forum
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12V wiring diagram ???? NEED HELP

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jds535

11-25-2004 14:15:32




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Hello, I have a 51 8N and am in the process of switching it over to a 12V system. I bought a Sparex conversion kit and followed it to a T except the ampmeter. My ampmeter did not have connection posts so I just bypassed it. While hooked up like this it didn't charge. When the battery cable is removed it stalls. I then did a search on this website and found the wiring diagram for 12V conversion on Nseries.com. I wired it exactly like the diagram shown. It seemed to charge OK but would stay running when the key is turned off. If I unplug the wire coming from P1 it seeems to charge right and turns off when the key is turned off.

Is this OK? Does this bypass the regulator?? Will I burn up my battery?
Where did I fail in these two wiring diagrams??

Any help would be appreciated.

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Roland (AL)

11-25-2004 18:26:20




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 Re: 12V wiring diagram ???? NEED HELP in reply to jds535, 11-25-2004 14:15:32  
On my 2N I hook the P1 wire to the acc. on the switch. It has charged and worked good for 3 yr's with no problems. Try this it will work.

Later Roland (AL)



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Bob

11-25-2004 15:59:01




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 Re: 12V wiring diagram ???? NEED HELP in reply to jds535, 11-25-2004 14:15:32  
The ammeter you have is an induction ammeter. The wire loops through the back, and the ammeter reads the amps flowing through the wire by the strength of the magnetic field surrounding the wire.

Did you put a "marker lamp" in series with the wire to the number 1 alternator terminal, as shown in the "N Series" diagram?

You can put a 4 Amp 1000 PIV diode in the wire to the #1 terminal, cathode (white banded)end toward the alternator, or use a pilot or "side marker" light with a #194 bulb. The #194 bulb is critical, as it passes enough current to excite the alternator, but not enough the keep the engine running with the key "OFF".

It is best NOT to unhook the battery on an alternator equipped machine with the engine running due to the risk of voltage spikes damaging the alternator.

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Bob

11-25-2004 16:01:55




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 Re: 12V wiring diagram ???? NEED HELP in reply to Bob, 11-25-2004 15:59:01  
P.S....

To verify if it is charging, check the battery voltage with an analog meter, or quality digital meter. (Cheap digital meters often get "headaches" from the electrical "noise" generated by the ignition and charging systems, and read erratically.)

The battery should be charging in the 13.8 Volts to 14.75 Volts range.



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Russ in SoCal

11-25-2004 14:44:58




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 Re: 12V wiring diagram ???? NEED HELP in reply to jds535, 11-25-2004 14:15:32  
jds535,
Do you have the marker light in the P1 wire to coil? (Ref: N-series.com wiring diagram.) Either that or a diode. It is there so your tractor will shut off with the key.
Russ



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jds535

11-25-2004 15:02:48




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 Re: 12V wiring diagram ???? NEED HELP in reply to Russ in SoCal, 11-25-2004 14:44:58  
nope, I guess I didn't follow the directions to a T after all. What does " double contact balde type light " mean? I have an old junk chevy pickup in the back, can I take a side marker light off this and connect it in?



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Donn (MI)

11-25-2004 16:50:35




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 Re: 12V wiring diagram ???? NEED HELP in reply to jds535 , 11-25-2004 15:02:48  
I'm in the process right now of switching mine over to 12 volt, I went to radio shack for a couple of bucks and got a 12 volt light to put in the dash and wire into the #1 wire. they come in red, green, and amber I believe. This will excite the alt. and make it charge at low RPM from what I have read. I'm sure that if I'm wrong, DELL will come along and tell us so. Good Luck



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jds535

11-25-2004 16:54:54




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 it works now in reply to Donn (MI), 11-25-2004 16:50:35  
I put in the marker light and it seems to work correctly. One thing though, I have to idle it down to shut it off, if it is idling too high it will stay running and the light will blink brightly. I will check to make sure it has a # 195 bulb.

You guys are awesome, thanks for the help.



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Bob

11-25-2004 17:17:47




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 Re: it works now in reply to jds535, 11-25-2004 16:54:54  
GM designed the 10SI alternators to work with the "idiot lights" they were using in their instrument panels, #194's.

The rating of these bulbs is 0.27 Amps at 14.0 Volts, which is adequate to excite the alternator and NOT cause the engine to run with the switch "OFF".



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