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Dual Battery TP2 Option in a 2010 2500HD gasser

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ExtraSlow Enthusiast

ExtraSlow

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Just wanted to double check how the factory dual batteries (Option TP2) in my 2010 Silvderado 2500HD gasser are wired.  I found this description in an archived thread that sound reasonable but wanted to double check.  

 

Quote
  • Posted by minibike132  

There can be alot of confusion because there are a few different ways to wire dual batteries up. There are also options on individual vehicles after the batteries that make a difference. Without knowing exactly what you have (TP2 isn't the only code that makes a difference in how it all works so a vin would help) I can only give some basic answers to your questions.

  • Does the starting system use both bateries to start the engine?-------No not on your vehicle
  • do both battries charge at the same time?-------------Yes on your vehicle
  • If I replace the main battery should I replace the aux. at the same time?------Yes, always in my opinion

 

Ok well I can do better than basic but this may not be the whole story. The auxillary battery is active anytime the ignition switch is in the run position with TP2, it is not involved in the circuit when the switch is in the crank position. Charging with the alternator only takes place with the vehicle running and switch in the run position so it is going to be charging at the same time as battery 1. That doesn't mean it's charging at the same rate, that depends on battery condition. If one is not as healthy as the other than charge rates are going to vary side to side. That brings us to the last question about replacement, there is debate here, but my suggestion is to maintain system integrity I always replace them at the same time with the same type of battery and I try to make sure the manufacturing date is close on both.

 

ExtraSlow Enthusiast

ExtraSlow

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Posted

doing more reading, it appears very different than the dual batteries in diesel trucks  

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Dmax trucks do not have RPO TP2, which is the auxiliary battery optional on Gas trucks. The Dmax has RPO TQ3, which is a dual battery system so as stated above, the fuse is needed.

 

ExtraSlow Enthusiast

ExtraSlow

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I guess I also want to double check that I'm reading everything right in that the "primary" battery is the one on the passenger side near the firewall, and the Aux is the one on the drivers side near the radiator.  

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