You are taking battery voltage from a good battery and transferring it to a dead battery. It’s a quick way to get some power if needed Disadvantage The advantage to charging while not driving is that you are not consuming gas or needing to drive around unnecessarily. That is one reason your alternator is important: it gives that constant power, not the actual battery. A starting battery is not meant to provide constant power. At the same time, the trailer has a deep cycle battery meant to use power consistently and to be able to drain down almost fully. However, your truck is a starting battery designed to give a burst of energy to get it going. Both batteries indeed provide the same 12V voltage. Vehicle battery designed for burst energy for starterĪnother thing to consider is that your truck and trailer batteries function differently in how they provide power. For more info on that, see my post on how to use jumper cables to charge your RV battery. So it is like getting jumper cables and connecting 2 batteries together. It is a direct connection with no added power. This pin is connected by a wire going straight to your vehicle battery. Charge Your Battery While Not DrivingĬan you charge your trailer battery while your tow vehicle is not running? The answer is “yes.” But there are some important things to consider so you are not stranded with no power in either battery.Ībove, we reviewed that you are always getting 12V power from the power pin of your connector. It takes hours to top off a weak battery, so if you are only traveling for an hour or two, that battery charging may not be enough. Unless you drive for hours, you may not have enough time to allow your trailer battery to take charge. So with constant voltage going to the weak battery, it will eventually charge and get the 12V to 14V it needs to be considered fully charged. As you reviewed above, charging a battery transfers power from more voltage to less. Your advantage to charging while you drive is that you have constant power going to your trailer or camper battery. Your alternator acts as a battery charger, just like a trickle charger that you may have at home. With a 12V system, you can safely operate from 12V to just over 14.5V. Charge Your Battery While DrivingĬharging your trailer or travel trailer battery while driving is best if you use your 7 pin to charge.Īs you drive, your alternator (on your tow vehicle) provides constant power, usually around 14.5V. And then you have two batteries now that won’t work. Eventually, a good battery will give it power until it equals 10V (12v+8v / 2 batteries = 10v ea). So depending on how weak your battery is, you could end up with two weak batteries.įor example, if you have a good 12v battery, connect it to a battery with only 8v. When you are connected only to another battery and do not replenish that power, the weak battery will eventually take only so much before both batteries are equal in voltage. In the case of being connected to a charger or shore power, there is a constant flow of power going to the weak battery. When you are charging a battery from another battery, shore power, or even a battery charger, power flows to the dead battery by a wire. Whether you have a deep cycle battery or even an AGM battery, your voltage is the same at 12V. Voltageīoth your tow vehicle and RV battery are 12V. However, there are limitations in voltage that we will discuss further. This may sound great, and it will fix all of your RV battery issues. So when you connect your trailer to your truck, you create a battery charger. These are pins only used as needed when driving. This pin is powered directly from your truck battery and is constant power as opposed to brake and running lights. You can check this with a volt meter to show you are getting power even when the truck is not turned on. One of the pins is specific to providing constant 12V power to your battery. This means it’s possible to power functions such as reverse lights, brake lights and brake controller activation without having to rewire your vehicle or trailer separately. For starters, the 7 pin connector uses various pin connectors to wire certain components. Final Thoughts How you can use 7 pin to charge your batteryĮach pin of your connector has a special function and job related to giving power as needed.How you can use 7 pin to charge your battery.We will review the advantages and disadvantages of each method and how well they work. It can also work even if you are not driving your truck and are connected to a trailer, camper or travel trailer. Charging your trailer battery with a 7 pin plug is a great way to keep your battery topped off as you drive your tow vehicle.
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