![]() ![]() ![]() The driver side battery is the "secondary". It is grounded to the chassis in numerous places, as well as presumably the engine block. Comes with all trucks, regardless of dual batteries or not, and connects directly to the Battery Junction boxes on both sides of the truck in addition to the starter. The passenger side battery is the "primary". There is no isolator, so they do not act as a "starter" and "house" battery configuration. ![]() This will be devoid of screenshots because I don't know AllDataDIY's policy around them.įirst of all, something that's more well known: the batteries are wired in parallel so they both contribute current to starting, as well as act as one large battery for capacity. They don't offer anything for the newer model years yet for the Super Duty. I also don't know how different things were in previous generations. While I doubt this has changed for 21MY and 22MY, it's technically possible. Of note: this information is from wiring diagrams for 20MY. Hopefully this will help folks with general knowledge, troubleshooting, and modifications.Īs a part of the electrical planning for my truck, I went ahead and paid for AllDataDIY so I could get wiring diagrams. If there is anything you would like to add, please feel free to leave a comment below.I know the wiring for the factory dual batteries has always been a bit nebulous, so wanted to shed some light on it. 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. If it passes the test, it’s time to move on to the alternator. 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. ![]()
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