2 batteries

Hey guys need some help on how to wire up 2 batteries so that they will both charge from the alternator. What has worked best for you guys?

Battery isolators work good for this purpose. Can't remember, but I assume there is no battery under the hood? If so, then both batteries in the bed ar the only batteries in the truck. An isolator has 3 terminals on it. The center one goes to (comes from?) your alternator. Each outer terminal goes to the positive of each battery. The theory is one alternator charges both batteries and the bulk of the charge goes to the battery with the least resistance (the one with the least amount of charge). With the isolator, one battery can be connected to a stereo and be drained almost dead while sitting in a parking lot, but the other battery is "isolated" from the stereo and therefor not effected. In other words you can still start the truck.

The down side to an isolator is that you ony get the power from one battery (you can't hook both batteries to the stereo).

If you wire the + of batt #1 to the + of batt #2, then you get the combined power of the 2 batteries and they should both charge evenly. This is similar to the F350 that I drive - it has 2 batteries wired in parallel to give more starting power, but there is only 1 alternator.

Hope this helps some.

Stereo really only needs one battery, it's the voltage that matters not the amperage