Are you planning to install a 12v battery isolator for your RV or boat? You must first understand how to properly wire it. A battery isolator is essential to ensure that all your batteries are charged and maintained. In this article, we will explain what a battery isolator is and how to install it. We will also provide a wiring diagram, FAQs, and tables to help you understand the process better.
What is a 12v Battery Isolator?
A battery isolator is a device that allows you to charge multiple batteries from one alternator without the risk of draining the starting battery. It isolates each battery from the other while charging. The isolator also ensures that the batteries don’t discharge each other when the engine is turned off.
Types of Battery Isolators
There are three types of battery isolators: diode-based, solid-state, and electro-mechanical. The diode-based type is the least expensive but has a voltage drop of 0.7 volts. The solid-state type is more expensive but has no voltage drop. The electro-mechanical type is the oldest and most reliable.
Why use a Battery Isolator?
A battery isolator is necessary when you have multiple battery banks that need to be charged from one alternator. Without a battery isolator, the starting battery could be drained, leaving you with a dead battery and no way to start your engine.
Wiring Diagram for a 12v Battery Isolator
Below is a wiring diagram for a 12v battery isolator. It shows how to connect the battery isolator to the alternator, starter battery, and auxiliary battery. Follow these steps to wire your battery isolator.
| Wire | Color | Description |
|---|---|---|
| 1 | Red | Connect to alternator output |
| 2 | Black | Ground wire |
| 3 | White | Connect to starter battery positive terminal |
| 4 | Yellow | Connect to auxiliary battery positive terminal |
Step 1: Connect the red wire from the battery isolator to the alternator output. You can find the alternator output wire near the alternator or in the engine compartment.
Step 2: Connect the black wire from the battery isolator to the ground wire. The ground wire is usually connected to the vehicle’s frame or engine block.
Step 3: Connect the white wire from the battery isolator to the starter battery’s positive terminal. The starter battery is the primary battery that starts the engine.
Step 4: Connect the yellow wire from the battery isolator to the auxiliary battery’s positive terminal. The auxiliary battery is the secondary battery that powers other accessories.
FAQs
1. Can I use a battery isolator with lithium batteries?
Yes, you can use a battery isolator with lithium batteries. However, you must use a battery isolator that is designed for use with lithium batteries.
2. Can I use a battery isolator with solar panels?
Yes, you can use a battery isolator with solar panels. You must connect the solar panels to the auxiliary battery’s positive terminal.
3. Can I use a battery isolator with an inverter?
Yes, you can use a battery isolator with an inverter. However, you must connect the inverter to the auxiliary battery’s positive terminal.
Conclusion
Installing a 12v battery isolator is essential when you have multiple battery banks that need to be charged from one alternator. The isolator prevents your starting battery from being drained and ensures that your batteries are charged and maintained. Follow the wiring diagram and instructions provided in this article to install your battery isolator. If you have any questions, refer to the FAQs or consult a professional.
