Alternator Guide – Can Water Damage the Alternator Of A truck?

The alternator is a vital part of your truck that takes the mechanical energy from the engine and turns it into electrical energy that is stored in the battery. The electrical energy aids in the smooth operation of other electrical components of the engine. 

It is essential to understand how to maintain your alternator, and you should be aware of various issues that might arise and how to repair them. The alternator is one of the components of your truck that you can easily monitor. After reading this guide, you will understand what happens when your alternator comes in contact with water.

Is An Alternator Waterproof?

Regarding water and alternator, most truck owners always need clarification. Your alternator is not waterproof, and thus you must check it when it gets into contact with water. You will need to repair your alternator for it to function correctly. Your alternator may not be watertight, but it does not imply that it is resistant to water.

Bearing at the back of your mind how an alternator is built to function, it is almost impossible to be waterproof. A number of the alternators are air-cooled. They have an internal fan that draws air to cool the inner components. 

The non-drive end sucks air in while the drive end expels air from the alternator. Since your alternator is not waterproof, it does not mean it is not water resistant. 

What Happens When Your Alternator Gets Wet

You now know that the alternator is not waterproof or safe to expose to water. Here is what is likely to happen when your alternator gets wet. 

Exposure to too much water can damage the alternator of your truck. But a drop of water does not significantly impact your alternator. However, if you expose it to flooded water, it can turn nasty. Your alternator will get damaged when a good section is exposed to water. 

For an instance, its parts such as bronze and brass, are exposed. Such parts can endure severe damage when your alternator becomes damp. Such brushes are regularly lubricated to reduce wear and electrical arcing. But when the brass and bronze are submerged in water, the oil lubricating them will wear away, which can harm them.

When your truck is submerged, debris like sand can get into the alternator’s brushes, which makes them freeze and lose touch with your slip rings. 

Drying a Wet Alternator

When your alternator is wet, the brass and bronze suffer. You must clean it as soon as possible. Doing this will prevent further damage.

Consider spraying your alternator with CRC electric clean, then use it after 24 hours. Let your hood open for better air circulation. Doing this protects your alternator from damage.


An alternator is an essential part of your truck. It generates electrical energy for your truck. An alternator is not waterproof and has air openings that water can take advantage of to access the delicate inner parts. If you drove in a flood area, consider taking your alternator for a check-up to avoid further damage. 

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