Posted by KEB1 on November 25, 2008 at 20:14:42 from (63.228.85.58):
In Reply to: 6 volt to 8 volt? posted by 1951farmallh on November 25, 2008 at 09:48:19:
An old tractor (or car) with a cutout relay will charge an 8 volt battery, just a little slower than it will a 6 volt one. With a voltage regulator, the voltage cutout relay inside the regulator has to be adjusted to produce a higher voltage, or the 8 volt battery will never charge properly. Not difficult if you have some knowledge of the inner workings of a voltage regulator and a decent voltmeter.
My '43 H still has the cutout relay, but someone could have changed yours to a regulator somewhere along the line.
Using an 8 volt battery is a quick & dirty work-around for a poorly maintained 6 volt system. A 6 volt system with a good battery and properly sized cables (at least 2/0, bigger is better) will spin the engine over plenty fast enough, even when its really cold.
Running on 8 volts will shorten the life of any bulbs, although they will be a little brighter until they die. Had an old Willys jeep that someone had put an 8 volt battery in, ended up going to back to 6 volts.
Use it if you want and its free, but there's really no reason to change from a properly maintained 6 volt system.
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