A jet ski engine has many similarities to your car and truck engines, but they vary on many things.
One thing that is different with jet skis in comparison to cars is that a jet ski uses a stator instead of alternators.
While stators and alternators work very similarly, they’re not completely the same and have some unique differences. In this post, I want to go over why a jet ski uses a stator instead of an alternator and the other parts of your jet ski charging system.
Do jet skis have Alternators?
Jet skis don’t use alternators and instead use a stator for their charging system.
A stator works very similar to alternators, both charge your battery, but a stator is more focused on maintaining the charge (“trickle charge your jet ski battery“).
A stator is mostly used on smaller engines like jet skis, instead of an alternator because they don’t take up as much room, simpler, and they got the option to be stored inside the engine block.
Why Do Jet Skis have A Stator?
There are 3 reasons why alternators are not used in jet skis and a stator is used instead.
- Stators are smaller.
- Stators can be built into the jet ski engine, which cuts down on weight and costs of manufacturing.
- Stators are simpler.
A stator is a simplified alternator that produces just enough power for small engines with batteries. Saving weight, cost, and keeping it simple is the goal with jet ski manufacturers, and thus they have stators over alternators.
Stators Vs. Alternators
What makes a stator different from an alternator is the magnets.
All generators move copper wires through a magnetic field to create electricity. Stator and alternators are no different and work the same way.
What is different is that a stator will have fixed magnets and an alternator has electromagnets.
The alternators create their own magnetic fields, and doing so allows it to better control the power output of alternators. No matter what RPMs the jet ski engine is spinning or how much power you need, the car’s alternator can adjust the magnetic field to get the power it needs.
Since the magnets on a stator are fixed and don’t change their magnetic fields, the power they produce is dependent on the engine’s RPMs. To control this power and convert the AC to DC to charge the battery, a voltage regulator (also called a voltage rectifier) is used.
Fixed magnets allow stators to be smaller and lighter, and you can put them inside the jet ski engine block. A stator just makes sense for a jet ski.
What Is A Voltage Rectifier?
A voltage rectifier, also known as a voltage regulator, takes the power made by the stator, changes it from AC to DC, and smooths it out so it’s more stable and reliable.
Jet skis use a stator, which have fixed magnets. This means the faster the engine spins, the more power it produces. If too much power is made, it can damage sensitive electronics or even ruin the battery.
A voltage regulator helps control this by cleaning up the power and making it usable.
Over time, a jet ski voltage regulator can wear out do to constant use and abuse from the salt and water.
A common sign of a bad voltage regulator is a “12-Volt Low” warning on the jet ski display. However, this could also mean the battery is bad, the ground wires are dirty, or a fuse is blown.
How do you replace a voltage regulator on a jet ski? Replacing a voltage regulator on a jet ski is usually easy. It’s often located near the battery and held in with just a few screws. Before replacing it, always disconnect the battery from the jet ski for safety.
This is off track from the earlier question. I have a 2003 Honda Aquatrax (sp) It’s been serviced winter and summer. Garage kept. Do have cover for it. Practically new tires on trailer. Low hours. Is it worth keeping since we don’t take it out much or should I sell it?
If it’s running fine, I would keep it until it doesn’t. Honda made some great jet skis, but certain parts will be difficult to find, but you can still do the basics like an oil change and such.