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Dual battery charging question

  • 1970
  • 911T Targa
Mileage: 
40 000
Electrical
Tabernacle, 
New Jersey

I have a early 911T  that I purchased new. The car is configured with dual batteries. Since the car sits idle from time to time, the batteries are removed and kept on a battery tender. I would like to charge both batteries while hooked up in the car.  Since the batteries are connected in parallel, (12 volts)  can I connect the battery tender negative lead to car chassis ground point and the positive tender lead to either battery positive post and charge both batteries at the same time. I do not think the battery tender will have a problem because of the low current draw but I am concerned about possible damage to the BOSCH cd box, the alternator or the voltage regulator. Thanks for your help.

 

 

 

 

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