Posted by Pete Black on May 07, 2017 at 07:08:56 from (107.77.90.16):
In Reply to: 6 volt system posted by BMLutra on May 07, 2017 at 05:06:54:
Here's my take; the battery has two primary purposes on initial startup, to provide reserve cranking power and provide voltage for ignition spark. Once the engine is running then the generator' s purpose is to recharge the battery and run the auxiliaries on the tractor, therefore, dependent upon battery state of discharge the amp meter should show a substantial positive amp flow. As battery charge is increased then the amp meter indication should decrease and continue to until the battery is fully charged. At this point the battery remains in standby power and the generator provides the power for the auxiliaries, which on a 6 volt system, other than providing ignition, is very limited and typically is lighting. Therefore once battery is fully charged then the generator ampere output is quite small unless the auxiliaries need is more than the generator can produce at which point the battery then contributes to carry the additional load. After auxiliary load is removed then the generator recharges the battery to a fully charged condition. This is why you see varing charging rates. As Bob stated 30 amp meter versus 60 amp meter will show a substantial difference in amp meter hand position only due to its calibration.
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