this is where the battery output will show a good reading of 12.5 volts, but when a load is placed on it the volts drops out. the other common failure is when a battery will internally open due to defective design or not being properly secured/handled. this is when the cell short shows itself. normally these failures show up when the extreme heat/cold arrive. cells shorting out will occur in any climate. Maybe ask a dealer mechanic who is trained on duramax engines.Ĭlick to expand. I kind of doubt both batteries are in parallel. You might stop by a Chevy/GMC dealer and see if there are any duramax trucks around and look at the battery setup. An isolator sure makes sense because it can cost you dollars later on. The cables between them will get warm and maybe hot enough to melt the insulation. Depending how the battery died it can draw a lot of current from the good battery. With a second battery in parallel the voltage difference will drain the good battery and the current flow will reverse. Should one battery have a short it is now below 10 volts and the starter motor will never spin. Up north it's usually a slow death in cold weather. In the heat of Florida, most batteries have a instant death because one cell shorts out. The biggest problem you can have is if one of the batteries dies. I have the same truck and the second tray does look inviting to use it. This is just my opinion, I am sure others will chime in. You get home, recharge the dead battery and all is good. You always have the other battery at full charge to restart the truck and get you home. Lets say that that battery completely dies. I just like the fact the you can tailgate/ party with the radio on (or multiple things charging) and the truck off for hours, you run off of one battery. I believe that an isolator is always a good idea. An alternator is meant to maintain your battery charge, not recharge a dead battery. But, even with one battery it is never a good idea to recharge a dead battery with your alternator. Sure, if somehow you killed both batteries and attempted to use the alternator to charge them both at the same time, then you may have an issue. Actually, I would think that it would prolong your alt life, as when you need more power there is another source and the alternator does not need to run at max production to keep up with your needs. If you are not killing the battery now with one battery (because the alt can not keep it charged) then I highly doubt that there would be any damage from 2 batteries. Basically the alternator is just going to keep both batteries charged.
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