Charging system troubleshooting question

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L.A.B. said:
The ammeter connection between the 'battery negative terminal' and the 'cable' mentioned in the test should be the brown/blue harness wire, not the starter motor cable or don't use the electric starter.
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In order to do the 'DC input to battery test' exactly as the manual dictates, so I get accurate results, I need a 1 ohm resistor, so I ordered a couple 1 ohm, 100 W wire wound resistors from amazon for $11. They won't arrive until Wednesday.
 
Arlen Johnson said:
So can I conclude there is nothing wrong with the charging system?
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If I keep the same connections for the 'DC input to battery test' and switch the VOM to DC volts, shouldn't I see the voltage pushing electrons into the battery? And as long as it's in the neighborhood of 13+ volts doesn't that further indicate the charging system is doing its job?
 
Arlen Johnson said:
So can I conclude there is nothing wrong with the charging system?
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Well, not if what it says in the manual is correct, however, it doesn't seem to agree with your original findings (below) unless there was a bad connection?

Arlen Johnson said:
Third test:
- Engine at 3000 RPM
- Voltage at power outlet =~ 12.5 V

Conclusion:
The battery isn't getting charging voltage (above 14, or so). In fact, the voltage at the power outlet goes down with the engine running. I assume the voltage at the battery is also about the same, 12.5 V.
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Arlen Johnson said:
If I keep the same connections for the 'DC input to battery test' and switch the VOM to DC volts, shouldn't I see the voltage pushing electrons into the battery? And as long as it's in the neighborhood of 13+ volts doesn't that further indicate the charging system is doing its job?
Click to expand...

Reconnect the wire and test (DC volts) between the battery terminals.
 
L.A.B. said:
Well, not if what it says in the manual is correct, however, it doesn't seem to agree with your original findings (below) unless there was a bad connection?





Reconnect the wire and test (DC volts) between the battery terminals.
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Before starting the engine and right after disconnecting the battery from a trickle charger there were 13.25 volts across the battery terminals. With the engine running it dropped about 1/2 volt. It didn't matter what RPM; the voltage stayed the same.
 
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