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Tractor Talk Discussion Forum

6-volt lamp burn out fix on 8-volt systems

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Jim-bobb

10-18-2005 17:07:55




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Go to Radio Shack & order #276-1661 for $2.49 per four pack. These are diodes. Tie three diodes in series & insert in the light hot wire. These will drop about 2.4 volts no matter what the current draw is up to 6 amps. All must have the same series orientation (stripe around the diode case pointing in the same direction). No light? Reverse the diode string direction (swap the hot wire lead for the power wire lead to the diodes).

More wiring details has been posted in the JD section. After all, JD is not the only 6-volt tractor, thus I posted here as well!

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Bob

10-18-2005 22:47:42




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 Re: 6-volt lamp burn out fix on 8-volt systems in reply to Jim-bobb, 10-18-2005 17:07:55  
That's great advice. Each silicon rectifier junction has a forward voltage drop, and connecting them as you say will definitely prolong bulb life. Want a little more brightness... use 2 diodes in series instead of 3.



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Jim_bobb

10-19-2005 08:24:25




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 Re: 6-volt lamp burn out fix on 8-volt systems in reply to Bob, 10-18-2005 22:47:42  
Some generator charging systems apply about 9.5 volts to the battery during charging & would idle back to approximately 9 volts once the battery is fully charged. It really depends upon the size of the generator & regulator setting. Some generators are limited to about 9.5 volts output due to the design.

Two diodes will allow .8 volts higher voltage at the lamps. With a generator charging system that averages 9 volts out on a fully charged 8 volt battery, voltage to lamp would be 7.4 volts.

Guessing approximately .4 volts losses in the tractor lighting circuit wiring & light switch would place 7 volts on the lamp. In this case, the 7 volts would afford bright lights without severely limited lamp life.

The problem with 6-volt headlamp brightness is many are only 25-watt bulbs at 6-volts. A 55-watt 12 volt auto type headlamp is much brighter. A pair of 25 watt headlamps tax the generator to about 8 amps at 6 volts and closer to 9.5 amps at 7 volts. Some generators can not supply more than 12-15 amps in an 8-volt system. The higher voltage of 7 to 7.5 volts does make for a brighter headlamp.

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Leroy

10-18-2005 17:38:23




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 Re: 6-volt lamp burn out fix on 8-volt systems in reply to Jim-bobb, 10-18-2005 17:07:55  
The light bulbs for 6 volt are also rated for 8 volt right on the bulb, it will say 6-8 volt so no reason for that bulb to burn out on 8 volt and in 30 year of using 8 volt have never had a bulb go bad because of the 8 volt, actually they will last longer on 8 volt



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Jon Hagen

10-18-2005 18:42:38




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 Re: 6-volt lamp burn out fix on 8-volt systems in reply to Leroy, 10-18-2005 17:38:23  
Not quite right,Leroy The reason that your light bulbs say 6-8V is that a 6V generator has to put out 7-1/2 volts to charge a 6 Volt battery,putting light voltage near 8 volts on a running tractor. With an 8 volt battery installed,and the regulator adjusted correctly to 9-1/2 volts needed to fully charge the 8 volt battery,the life of a 6-8 volt bulb at 9-1/2 volts is cut by 50-75%.



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Jim_bobb

10-18-2005 18:15:19




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 Re: 6-volt lamp burn out fix on 8-volt systems in reply to Leroy, 10-18-2005 17:38:23  
My headlamp bulb states 6V-4A. The number is a 1133 & specification is actually 6.2 volts @ 3.91 amperes. The tail light is a number 88 & states 6V-2A. Actual specification is 6.8 volt @ 1.91 ampere.

Where did you get the 6-8 volt bulbs? Walmart?



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edchainsaw

10-18-2005 19:14:30




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 Re: 6-volt lamp burn out fix on 8-volt systems in reply to Jim_bobb, 10-18-2005 18:15:19  
I've not seen bulbs that were 6-8volt.. but I know it would be do able... just not right for either voltage.. LOL



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Jim_bobb

10-19-2005 08:30:12




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 Re: 6-volt lamp burn out fix on 8-volt systems in reply to edchainsaw, 10-18-2005 19:14:30  
An issue with the common #1133 6-volt headlamp bulb is they are only rated at 200 hours life at the rated voltage. The lamps usually last longer than 200 hours. But, at 8 -9 volts on the lamp, life is quite short.



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