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

Posted by Jim_bobb on October 19, 2005 at 08:24:25 from (69.179.60.49):

In Reply to: Re: 6-volt lamp burn out fix on 8-volt systems posted by Bob on October 18, 2005 at 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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