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8 volt automotive battery in a vehicle within six volt system
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Gerald J.
Posted 3/29/2017 21:46 (#5931635 - in reply to #5931474)
Subject: RE: 8 volt automotive battery in a vehicle within six volt system



The use of an 8 volt battery is a cobble of a working system.

6 volt starter draws more current than a 12 volt starter (can be twice) and so needs FAT battery to starter cables and CLEAN connections. In my experience with a new '54 Ford my dad bought that year was that battery posts and connectors needed cleaning twice a year. A task he assigned to me and 9 years later when I graduated from college he gave it to me as a graduation present. There just isn't much tolerance for the voltage drop of a dirty connection or too skinny wires starting with 6 volts. There is more tolerance for 12 volt battery connections but they ought to be cleaned about every couple years too.

8 volt battery works by giving more tolerance for bad connections and skinny wires, but to charge right it needs a voltage regulator change, or a unregulated three brush generator that is regulated only to limit the maximum current but overcharges the battery when run a long time. There are no standard replacement 8 volt regulators. And then lamp life will be short and also point life without dropping the coil voltage back to 6 volts as others have posted.

Gerald J.
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