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Ford Tractors Discussion Forum
Show Parts for Model:

801 headlight bulbs - 6V vs 12V

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Todd c.

08-13-2014 17:16:03
166.137.156.170



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I have several unattached headlight from 801 era tractors and some of the bulbs are not stamped 6V or 12V. Is there a way to tell what the are without burning out the bulb? - ie hooking up a 6V bulb to a 12 V system.




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NNP

08-15-2014 05:18:39
66.66.112.196



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 Re: 801 headlight bulbs - 6V vs 12V in reply to Todd c., 08-13-2014 17:16:03  
I use my old battery charger with the switch set to 6 volts.

works pretty good.

dim? switch to 12 volts on the charger.



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Sean in PA

08-14-2014 07:31:58
108.52.129.151



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 Re: 801 headlight bulbs - 6V vs 12V in reply to Todd c., 08-13-2014 17:16:03  
Hard to tell for sure without empirical data for the specific bulb. Most information I can find through Google say that the resistance of a 110 volt household bulb with a tungsten filament increase by around 15 times when they heat up to operating temperature.

Best answer for the original question, I think, without blowing the bulb, would be to connect it to 6 volts with an ammeter in line and see how much current it's drawing when it's hot. If it's marked 35 watts and it's a 6 volt bulb it should draw around 6 amps when connected to a 6 volt power source and if it's a 12 volt bulb it should only draw around 1.5 amps when connected to 6 volts.

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Sean in PA

08-14-2014 05:41:36
108.52.129.151



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 Re: 801 headlight bulbs - 6V vs 12V in reply to Todd c., 08-13-2014 17:16:03  
Keith, Your calculations are correct for once the bulb is up to operating temperature and is drawing 35 watts, but the resistance of a bulb filament increases as it heats up. Depending on the material of the filament and the application, the hot resistance could be more than 10 times the cold resistance.



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Keith Williams

08-14-2014 06:11:01
184.56.84.209



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 Re: 801 headlight bulbs - 6V vs 12V in reply to Sean in PA, 08-14-2014 05:41:36  
Sean,
I was concerned about that, not sure how to calculate that though? I question the ten times figure? if you watch an amp gauge when you turn on the lights, I don't think it would go to 60 amps then down to 6. Of course then the change in ohms would happen very fast as the light comes on.
Keith



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keith williams

08-13-2014 19:53:16
184.56.84.209



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 Re: 801 headlight bulbs - 6V vs 12V in reply to Todd c., 08-13-2014 17:16:03  
Todd C,
You could check the resistance with a VOM.
A 12 Volt 35W bulb should be around 4 Ohm.
A 6 Volt 35W maybe 1 Ohm.
Let me know if I'm close!
Keith



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HCooke

08-13-2014 17:48:16
70.195.66.72



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 Re: 801 headlight bulbs - 6V vs 12V in reply to Todd c., 08-13-2014 17:16:03  
Well you could hook them up to a 6 volt battery, if they are bright, they are 6 volt. If they are dim then they are 12 volts.



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soundguy

08-14-2014 07:56:58
69.34.131.64



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 Re: 801 headlight bulbs - 6V vs 12V in reply to HCooke, 08-13-2014 17:48:16  
bingo!



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