For some alternators its normal to see as low as 13 volts. Find an easily accessible spot near the starting battery.

Which Dual Battery System Do I Need Part 1 Smart Battery Isolator
Charging auxiliary battery with alternator. This smart charger completely and efficiently charges your auxiliary battery in 3 separate stages. Trace the wire from the battery post on the alternator marked b or b to your cars fuse box. The video in this blog highlights these lithium challenges and shows you what can happen when things go wrong namely alternator overheating smoke and an expensive alternator. How to charge rv battery while driving nowadays there are two basic common methods of charging the battery either through the solar panel or through additional batteries. Of the charging process the unit is in. Charging lithium batteries from an alternator be that in a boat or vehicle presents some challenges when compared to the straightforward nature of charging lead based batteries.
What you need step 1. However the time needed to charge the battery depends on many factors like battery size capacity discharge rate and charging current. All too often the alternator is condemned as the source of the problem if only battery voltage is present with the engine running. Disconnect the negative battery terminal. This reduces the power required. This ensures that the battery reaches maximum capacity without being.
If this is the case it only means that the alternator is not charging but does not reveal why. Maintain the charge on your rvs battery with this dual input dc to dc smart charger. Unit installs in your vehicle or trailer and pulls power from your solar panels before tapping. The battery isolator is a device that allows the cars alternator to recharge the auxiliary battery while protecting the cars starting battery from discharging if these batteries are simply linked together you run the very real risk of draining them both to a level that you can not start the engine and there are many other reasons why you should not do it this way. On the opposite end of the fuse the alternator wires to attach a wire and run this to the post marked in on the battery isolator. The alternator then just supplies the current that the car uses forever at the low voltage.
Mount the battery isolator in the engine compartment. If you have a smart alternator then you will need to use a battery to battery charger also known as a dc dc charger to ensure that you can charge your auxiliary battery effectively. This is an important safety step that isolates the starting battery so. After if deems the battery full then it drops the voltage as everthing else in the car can use lower voltage down to around 12v ok. Connect black ground cable to.