Parasitic battery draw 2009 LS

Rich2009Aveo

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Hi, my 2009 LS is showing a 100ma up to 300ma parasitic draw using a Fluke clamp-on meter on either positive or negative terminals. If the car is not driven for maybe a month, the battery then is flat dead. The draw value seems to fluctuate. Anybody have or had similar issues and ideas what/where to look? Many thanks in advance!
 

Rich2009Aveo

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Hooked up a current meter (Fluke clamp-on) around the negative cable and pulled each individual fuse, one at a time. Draw remained constant. Saw two YouTube videos that suggest it might be a diode in the alternator. Any suggestions as to how to go about checking this out? Ima scratch me bald head at this point šŸ˜ž
 

zora

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Attach a voltmeter to the alternator output terminal and ground and set it for AC voltage. If you get a reading, bad diode.
 

Rich2009Aveo

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Zora, thanks for your responses. Clarifications, please? Wouldn't that be meter set at DC volts? And which wire is the output wire? The pictures I have seen so far only show a 4 wire plug. Can this output be accessed up top somewhere? Thanks again!
 

zora

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Zora, thanks for your responses. Clarifications, please? Wouldn't that be meter set at DC volts? And which wire is the output wire? The pictures I have seen so far only show a 4 wire plug. Can this output be accessed up top somewhere? Thanks again!
Not DC, AC, it should not give an AC reading unless a diode has failed.
Have not seen your specific alternator you will need to look at the alternator or find a wiring diagram.
 
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