Avoid over-voltage issues with CDI’s Regulated Rectifiers

You may be asking yourself, “Why should I purchase CDI’s Regulated Rectifiers, when a less costly rectifier seems to do the same thing?” 

Well my friend, the answer is simple. On the surface a rectifier charges a battery quickly, but what you do not see, is the charge is not able to regulate at a safe level. What does that mean for your customer? It means expensive electrical components on their boat may produce erratic readings, and on many occasions, fail.

See the chart to the right to do the math.


Rectifier: A component that converts AC voltage (alternating current) to DC (direct current) voltage. The engine’s stator produces AC voltage and the rectifier converts it to DC voltage in order for it to continuously charge the battery.

Regulated Rectifier: A component that converts AC voltage to DC voltage AND regulates (maintains) the DC voltage to 14.4 volts.

The difference between a standard rectifier and CDI’s Regulated Rectifier is simple. The Regulated Rectifier has new technology that provides more stable charge to the battery. A more stable charge will prevent battery damage and even prolong the battery’s life. The CDI Regulated Rectifier also converts AC voltage to DC voltage, leaving no interference to other electronics.

With the CDI Regulated Rectifiers, you get the benefits and stability of the regulator, but in the same easy-to-install case as a standard rectifier. CDI’s new line of Regulated Rectifiers fit most Johnson Evinrude engines. Click here to view a full list of the regulated rectifiers we offer.

CDI’s Regulated Rectifiers is a direct replacement for Johnson/ Evinrude and applicable to many Mercury Marine outboard engines.







Chart A shows voltage and current reading of a standard rectifier.







Chart B shows the more stable voltage and current reading on a regulated rectifier.

“The customer’s complaint was too much voltage on his volt meter. he was seeing 16-17 volts on the charging system. When I installed the CDI Regulated Rectifier, the voltage problem was corrected. it was a simple installation and probably saved the customer from future issues.” – Glenn’s Boats, Madison, AL
“When an over-voltage issue occurs on my customer’s boat, such as 15-17 volts on the volt gauge, 9 times out of 10 all it takes is installing a CDI Regulated Rectifier to solve the problem. It’s easy to install and works like a charm.” – Premier Boats, Atlanta, GA