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Old 07-22-2016, 11:29 AM   #41
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Originally Posted by RSchleder View Post
Even with the car running, the battery supplies the 12V to the accessories and engine so the alternator simply recharges the battery as it's power is depleted.
Not true. The alternator is putting out a higher voltage and the battery is just another LOAD (that why it's being charged) for the alternator to supply.

(You could quibble about the battery "filtering" any ripple in the alternators output, but overall, the battery is still a LOAD.)
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Old 07-22-2016, 11:40 AM   #42
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Originally Posted by Blackhat6mike View Post
29 out of 30 and I still argue that the radio runs off the battery and not the alternator. Take the alternator out and the radio will still work. Remove the battery and everything stops. JMHO
Agree with everything you say except once the engine is started, you can remove the battery and the engine will still run off the alternator/generator.
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Old 07-22-2016, 11:50 AM   #43
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I stand corrected. Thank you Gentlemen!
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Old 07-22-2016, 06:48 PM   #44
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since the alternator is putting out higher voltage than the battery, the alternator is the power source. without an alternator the battery is source.
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Old 07-22-2016, 07:30 PM   #45
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Agree with everything you say except once the engine is started, you can remove the battery and the engine will still run off the alternator/generator.

X2
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Old 07-22-2016, 10:30 PM   #46
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28/30. Otto who??!! I missed the other one when my wife flopped on the bed just as i was answering and caused me to hit the wrong button. I swear

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Old 07-25-2016, 07:24 PM   #47
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Old 07-25-2016, 07:49 PM   #48
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30 out of 30, he says as he shines his knuckles on his chest. But I cheated on one (Thanks Google) and got a hint on another.
More bragging: I came in 3rd in the state of Minnesota in the Future Farmers of America mechanics contest. Back then we were just moving on from steam engines. (well, not quite that long ago, mid 70's)
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Old 07-25-2016, 09:16 PM   #49
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A vehicle with a generator will continue to run if you disconnect the battery, however the same with an alternator will not unless it supplied with 'exciting' power, an alternator needs power to produce power.
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Old 07-25-2016, 11:10 PM   #50
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A vehicle with a generator will continue to run if you disconnect the battery, however the same with an alternator will not unless it supplied with 'exciting' power, an alternator needs power to produce power.

In reality they both require excitation voltage which regulates the voltage level. When either unit is "self excited" it will run on without a external power supply once up to speed. The difference between a generator and alternator is the generator excitor is stationery poles on the exterior of the case. With the armature rotates a commutator converts the voltage to DC.
In the alternator the field poles rotate with the controlled voltage/excitation to maintain a AC output from the Stator 13-14 volts are output, then converted to DC power.
So they both require excitation power and designed properly can self excite.




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