Battery for C

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   Battery in my '48 C has gone kaput. Currently has an 8 volt battery and checking voltage it charges at 9v+ on low and about 10.4 on high. Has someone adjusted the cut out to work with this battery or do they just work this way? Is an 8 volt bad for the system or is it fine to replace it with another? Can't spend any more than necessary so if 8v is safe I'll just do that this time around. Too many machines to fix right now to do a conversion. 
Thanks, Bill.

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Runamuck Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 22 Oct 2014 Location: West Central Mn Points: 31	Post Options Post Reply Quote Runamuck Report Post Thanks(0) Quote Reply Topic: Battery for C Posted: 23 Apr 2017 at 9:41am
	Battery in my '48 C has gone kaput. Currently has an 8 volt battery and checking voltage it charges at 9v+ on low and about 10.4 on high. Has someone adjusted the cut out to work with this battery or do they just work this way? Is an 8 volt bad for the system or is it fine to replace it with another? Can't spend any more than necessary so if 8v is safe I'll just do that this time around. Too many machines to fix right now to do a conversion. Thanks, Bill.

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DougS Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 03 Nov 2011 Location: Iowa Points: 2490	Post Options Post Reply Quote DougS Report Post Thanks(0) Quote Reply Posted: 23 Apr 2017 at 9:53am
	The cutout has little or no effect on the charging voltage. Put another 8 volt battery in if you wish, but a 6 volt battery should work if you have big fat cables and clean connections.

Gerald J. Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 12 Sep 2009 Location: Hamilton Co, IA Points: 5636	Post Options Post Reply Quote Gerald J. Report Post Thanks(0) Quote Reply Posted: 23 Apr 2017 at 12:29pm
	The 8 volt battery is a cobble for 6 volt systems to allow neglecting starter cable connection maintenance. Battery posts and connectors need cleaning at 6 month intervals with the 6 volt battery. The generator that charges the 6 or 8 volt batteries has no voltage regulator and is dependent on the tractor operator to use the light switch to turn down the charging current to cut back on overcharging. There is current regulation by the effects of the third brush in the generator and the resistance in the field circuit that is set by the light switch. The main sign of overcharging is loss of water from the battery electrolyte. Batteries need regular checking and refilling of that water when they are used with a three brush generator without voltage regulation. The regulators used with two brush generators are better on battery life but the solid state regulators like in the 10-SI alternator are much better at protecting batteries from overcharging and getting the batteries fully charged. I built a transistor regulator for VW generator about 1968 and it really did improve battery life. Gerald J.