Electrical Systems

Troubleshooting your boat's alternator can be difficult and unsafe. Learn the basics of the different styles and alternator circuits so that you have a better understanding of what type of alternator you have on your boat.

Most outboard engines don't require a lot of repairs in their lifetime.  Simple maintenance is usually sufficient for a long-lasting, well-performing engine.  However, one area that you may experience some trouble with is the outboard ignition system.  Most modern outboards use ignition systems consisting of a variety of electrical components.  As you can imagine, any time that there is potential of exposing electrical components to water, there is the potential for damage. Similarly, normal use can eventually wear out some components and require repair.

Troubleshooting an outboard ignition system is not so simple. When people are repairing their outboard's ignition system, one frequent issue we see at Marine Parts Source is that people will end up purchasing several different components trying to guess where the source of the problem is.  We have found that having a better understanding of the entire ignition system and how each component works can help you better understand

There aren’t many things more frustrating than waiting for that first perfect day in spring to get the boat back on the water only to realize you have a dead battery. Proper battery maintenance and storage should be an essential part of your winterization procedures, and it can help you avoid additional costs and headaches along the way. Here are a few tips to help make sure when the weather is ready for boating, your battery is ready as well.

1. First off, make sure you are performing regular maintenance on your boat’s battery. Clean the battery tops and battery posts of debris and corrosion, filling the electrolyte, check the voltage and recharge on a monthly basis.
2. Disconnect the terminals to remove all the electrical loads from your batteries. If you aren’t removing the battery from your boat, you will want to make sure all your switches are turned off. Or, simply remove any equipment that may cause a drain on the battery. Many electronics have small power loads that can drain your

Selecting the proper fuse for your application is arguably one of the most important tasks when it comes to your boat’s electrical system. There are a lot of choices out there, and sometimes it can be overwhelming.  Here are some important factors to consider when selecting the proper fuses.

Maximum Voltage Rating

One important requirement for selecting a fuse for your application will be the voltage rating necessary to properly protect the equipment. Most common fuses are rated for a maximum voltage of 32 volts DC while some (like the Class T fuse) are rated typically up to 125 volts DC. When it comes to marine electrical systems, the nominal boat voltage is 12 and/ or 24 volts DC but with emerging technologies like electric propulsion and solar becoming more popular,  more systems will likely be rated at 48 volts DC or higher.

Maximum Amperage Rating

Another important factor in selecting the proper fuse for your application is the amperage rating required to protect the wire and the

Battery isolators in marine applications have been used to maintain and direct the engine alternator DC charging in boats with multiple battery banks for decades. There are a number of reasons for installing an isolator in a boat with multiple batteries. First and foremost, the isolator can isolate the engine starting battery from the house/accessory battery or batteries. Second, the isolator will charge the battery bank with the lowest state of charge, then the next lowest bank, and so on when multiple battery banks are used. In twin engine applications where each engine has its own alternator, the isolator utilizes both alternators to the best of their ability and allows charging of all battery banks when just one engine is running. Keep in mind that the rate of charge is based on the alternator amperage output capacity.

Keeping Your Batteries Separate

Separating the starting battery from the house bank on a boat prevents the starting battery from being discharged when the engine is not