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Farmall & IHC Tractors Discussion Forum
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140 Farmall 6 or 12 volt

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Curt Cooke

01-09-2006 05:47:03




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I have an early 140 (bar grill). Charging system is not working and most wires are shot. Currently has a working 6 volt battery. I tested the generator, determined it to be not working. Removed wiring harness and found that the headlights are fed with #16 wire. That seems strange for 6 volt electrics. The early 140's were 6 volt weren't they?




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El Toro

01-09-2006 16:03:10




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 Re: 140 Farmall 6 or 12 volt in reply to Curt Cooke, 01-09-2006 05:47:03  
You probably need to have the generator and voltage regular checked at your local auto machine shop that repairs starters, generators and alternators. All those wire connections on the generator and regulator should be cleaned of any rust. Then see if you have any voltage output. You should either buy or make a new wiring harness. I would makeup or buy new 00
battery cables too. Hal

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John T

01-09-2006 06:48:57




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 Re: 140 Farmall 6 or 12 volt in reply to Curt Cooke, 01-09-2006 05:47:03  
Curt, the 16 Gauge wiring should handle a couple standard headlamps, its the wires ampacity (current rating) thats important instead of the voltage when deciding if it is sufficient for the load like lights or whatever. Its voltage withstand (insulation rating) capacity is wayyyyy yyy higher then either 6 or 12 volts anyway and, therefore, the same general purpose automotove/tractor hook up wiring would likely be the same. If the headlamps drew more current than what 16 Gauge wire was rated to handle (like say the wire was gettingn hottttt t) then, of course, it would need to be upgraded to 14 or bigger, but thats more due to current NOT the fact that its on a 6 or 12 volt tractor. The wire may well be rated for 200 or even 600 volts, depending on whats used.

Your concern can stem from a legitimate fact also, in that at 6 volts the same wattage of lamp would draw "twice" the current as if on a 12 volt system, which could indeed necessitate bigger gauge wires in some cases, but typical headlamps can often be served by 16 gauge on 6 or 12 volt tractors. STILL, IT ALL DEPENDS ON THE CURRENT AND THE WATTAGE OF THE LIGHTS i.e. nothing certain can be said sitting here as far as what gauge wire is required (16 or larger) not knowing the actual loads.

The place where heavier gauge wiring can be helpful is in the high amperage battery n starter n ground cables. I like to use 0 or even 00 Gauge battery cables in 6 volt applications. In that situation, the larger battery cables drop less voltage and dont waste/loose as much energy to heat versus delivering it to the starter where its really needed.

Yes, many of the early, and ESPECIALLY the smaller tractors were indeed 6 volts, but Im not a Farmall man and have absolutely no specs or data as to what tractors were what voltage originally.

Best wishes n God Bless

John T in Indiana

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Haas

01-09-2006 06:36:29




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 Re: 140 Farmall 6 or 12 volt in reply to Curt Cooke, 01-09-2006 05:47:03  
Early 140s were 6 volt. Then came 12 volt with generator and near the end, an alternator was standard. The 140s were produced for 20 years, so along the way, there were changes and improvements.



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