Posted by jdemaris on January 20, 2010 at 07:50:54 from (67.142.130.38):
In Reply to: Re: 8 volt battery posted by John T on January 20, 2010 at 06:42:17:
I disgree, strongly. A one volt jump in actual cranking voltage can make a huge difference in any system, 6, 12, or 24 volt. We had many 6 volt MCs, 40s, 420s, etc. Customer's machines that sat in the woods at temps down to 35 below F. They sometimes had trouble starting. With the best cables, controls, and standard battery, cranking voltage will still drop to 4 volts when it's well below zero, and cranking will be extemely slow. Using an 8 volt battery in that type of situation can make a big difference. And yes, using an 8 volt instead of a 6 is "robbing Peter to pay Paul." You gain cranking speed but lose some reserve capacity. Installing a huge 6 volt battery can also get the crank-voltage up.
As to having a regulator or not? Condsidering the age of an M, and the guy mentioning his regulator, I have no idea what he has, or if it's never ever been altered. We put Delco two-unit regulators on many MCs, # 1118308, to be used with the Delco shunt-wound 1101859 generators. Two unit regulator, with one being the voltage regulator. Increase the spring tension and the voltage setting climbs from the OEM 7 volts ,up to around 8.5 - 9 volts. Just enough to keep that 8 volt battery charged. With three-brush generators, it was sometimes more a struggle to make work.
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