If your battery is draining while driving, it is almost without exception the F250’s alternator that is causing the problem.
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Here’s a pretty good video on exactly how to track down a “parasitic draw”.īattery Draining While Driving: Ford F250 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 F250 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 F250’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 F250’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 F250’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 F250 is off, it’s usually caused by something that is drawing current that shouldn’t be. If your Ford F250’s battery is draining, it’s something that’ll need addressing right away.