That is why I need some input from others (such as yourself) who may have more experience with a factory dual battery set-up on a diesel powered vehicle. Again, I am only assuming and that is not enough for me. I see smaller gauge wiring coming of the batterry cable post connection on the battery(s) negative post which is similar to the smaller gauge wiring coming off of most single batteries's positive posts. To answer your other question in regards to the 'positive looking wiring on my batterie(s) negative post(s). I will be drawing a lot of amperage so this worries me. I am hoping I can get some information so that I do not do my installation and end up damaging either the truck's electrical system and/or components, or my amplifiers. Still, this would be a lot of assuming on my behalf. I would think that the batteries would be wired in parallel if the starter system on the engine requires 24 volts. I do not see any obvious connection between the two batteries although I'm sure there is one. If there is anything you would like to add, please feel free to leave a comment below.I can only assume it is a twenty-four volt system, being that it has two batteries and that it is a high compression diesel engine that perhaps requires a lot more torque for the starters to turn the engine over. Good luck running down what is causing your battery to drain in your Dodge Ram. If you hear a whining noise accompanied by the battery light, it’s almost guaranteed that it’s the alternator that is at fault. It could be a bad battery, or more likely a bad battery cable too. If it is you should see the battery or alternator light on, it indicates that the alternator is not creating the necessary voltage to charge the battery. If your battery is draining while driving, it is almost without exception the Ram’s alternator that is causing the problem. Here’s a pretty good video on exactly how to track down a “parasitic draw”.īattery Draining While Driving: Dodge Ram Maybe one of the map lights is on? How about all of the accessory plugs? Is something plugged into one of them and drawing power? Any aftermarket accessories? If not, it may be that there is an electrical problem. If your Ram is equipped with a glove compartment light, check and see if it is turning off. If this is the case, the first thing that you are going to want to look at is all of the lights. Something is drawing power when it shouldn’t be.The battery itself has gone bad and just can’t hold a charge long enough to be of any use after the vehicle sits, and it drains.If your Ram’s battery is draining after being parked for a few days, here are two possible scenarios. They usually don’t charge anything for this service, they just want to sell you an alternator if you need it. Most parts stores can test an alternator for you.

It is possible that the alternator wasn’t charging the battery enough when the vehicle was running and has left the battery drained. They are hooked up in parallel both batteries are equal. It has dual battries so I need to know which battery is primary to isolate the non primiary battery. If it passes the test, it’s time to move on to the alternator. I plan on hooking up a power inverter and a battery isolator to run a refrigrator in my 2007 3500 6.7. They’ll tell you if it holds a charge or not. They’ll need to charge it for a while, so plan on dropping it off and returning a few hours later. You can take it up to the local parts store and have it tested. If you didn’t see a battery light, and now the vehicle is dead when you go to start it, the first thing that you need to look at is the battery. If your Ram’s battery light came on while you were driving, but before you parked, it could be the alternator. When the battery drains when parked, the odds are that it’s the battery itself. They are usually less than 10 bucks at the local parts store or Wal-Mart. There are also specific battery post cleaners that you can buy. If there is a lot of corrosion here, you’re going to want to clean that off with a wire brush. You’ll want to take a look at your Ram’s battery posts where they bolt to the battery. Most of the time, it’s the battery itself causing this problem. If your vehicle is running fine when you park it, and it won’t start, there could be a few problems causing this to happen. If the battery is draining while you’re driving, that is probably going to be the alternator or battery. If it is draining while your Ram is off, it’s usually caused by something that is drawing current that shouldn’t be. If your Dodge Ram’s battery is draining, it’s something that’ll need addressing right away.

07 dodge 6.7 battery isolator relay