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Electrician version (what I was worried about)... If you had a battery at 0v and another battery at 12v hooked up in parallel with an alternator charging them. The voltage across the batteries would immediately drop to right around 6v. Since you're car operates on a 12v system this is no bueno...

I read through the link that modernbeat had posted and kept flipping through the pages... ultimately on page 28 someone brings up the concern I had. Basically the voltage drop amounts to nothing because the voltage of a dead battery is still relatively high...

Voltage drop happens as follows... This is assuming a solenoid isolator (isolated when vehicle off, when the vehicle is on combines the batteries in parallel. From my understanding, if you run your aux battery down (fridge, lights, w/e) then start the car, you end up with a surge of current...

I've read that post, unfortunately that solution involves a solenoid that simply connects the batteries in parallel while the vehicle is on. If the aux battery is depleted and the batteries become linked it can cause a drop in voltage which can damage the vehicle's electronics. So I want to...

So I am installing a deep cycle battery in my 2005 suburban and I'm trying to figure out how to separate it from the starting battery to prevent them from depleting themselves when the vehicle is off (also, I want to use the deep cycle to run things when the truck is off.) From my...

So I am installing a deep cycle battery in my 2005 suburban and I'm trying to figure out how to separate it from the starting battery to prevent them from depleting themselves when the vehicle is off (also, I want to use the deep cycle to run things when the truck is off.) From my...