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philfox
    
What could be the cause of battery drain when driving the car?
I have a 37 Chevy that has been fully restored. Testing shows the generator is providing 6.6 amps to the 6 volt new battery at idle. After the car has been driven 15 to 20 miles the battery doesn't have enough charge to turn the motor over to start the car. When the battery is charged up agian the car starts right away.
posted: January 28, 2014
 
    
 
  Answers (2)
 
retiredpartsman
    
The easy way to check the output of a generator is with the engine running disconnect the battery cable the generator should keep car running . DO NOT DO THIS WITH AN ALTENATOR IT WILL BURN IT UP. Your gen should be putting out 8 volts if memory serves me correct ,and about 25 to 30 amps .
posted:  January 28, 2014
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1960brookwood
    
Rev. engine to about 1200 rpm and check amp output. As stated it should put out about 25 amps. If not check belt tension and condition of belt. Also be sure belt is not bottomed out in the pulleys. If belt is worn or to loose it will slip under a load and will not charge properly. Also be sure belt is correct width and pulleys are in good condition.
sources: Personal experience!
posted:  June 24, 2014
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