Posted by JMOR on October 30, 2009 at 05:10:01 from (72.181.156.161):
In Reply to: 12 volt system posted by Faster346 on October 28, 2009 at 16:01:02:
minnmeyer said: (quoted from post at 01:24:19 10/30/09) In diagram 5.Is the wire from the ammeter to the start button,on the same terminal as the positive wire fromthe battery?Or is the wire from the ammeter,on the same terminal as the wire that goes to the starter?Is the ammeter showing you how much you are using from the battery or how much the alternator is putting out?
"Is the wire from the ammeter to the start button,on the same terminal as the positive wire from the battery?" YES.
"Is the ammeter showing you how much you are using from the battery or how much the alternator is putting out?" BOTH, almost....actually 'using from the battery or putting back into the battery' is the more accurate statement. Since the ammeter is the only connection to the battery (excepting the several hundred amp starter connection that is too much for most ammeters), it will indicate current going into the battery as a + and current leaving the battery as a - .
If you get the engine/alternator speed exactly right, you can make the net reading ammeter indicate exactly ZERO, where the alternator output is supplying exactly the same current the loads are using, resulting in zero battery current (no charge & no discharge).
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