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      The future of the JD Forum   07/31/18

      Thank you all for your participation on the JD Forums.  We have enjoyed answering your questions, providing project advice and technical assistance on this forum for a number of years. We believe that there are now better ways to provide this service for our customers and the community. With that in mind, we have made the difficult decision to discontinue the Jamestown Distributors Forum.   Our JD Tech Team is committed to being your trusted technical resource, and we encourage you to reach out via email, phone, social, product reviews, and to post questions using the Q & A 'Ask A Question' function on all product pages. Additional information can also be found on product page Technical Data Sheets (including detailed usage instructions and application data).   Thank You Jamestown Distributors 
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RickW

Rectifiers

2 posts in this topic

A recifier changes ac (what comes off the windings of an alternator, or the outlet in your house) to pulsating dc. Electrical filters in the circuit will smooth out the pulses and give a more steady dc voltage. These filters are capacitors (in electronic devices) or a battery (in a car or boat).

 

When a rectifier inside the alternator in a car or the diode pack on an outboard goes bad it quits charging the battery.

 

They also in the case of an alternator, prevent the windings of the unit from putting a continuous load on the battery that they are hooked to. For example, one of the first signs of a failed rectifier on an alternator is it draining the battery quickly while sitting. Often times, the alternator will be warm to the touch even if the motor has not been running.

 

Rectifiers usually contain diodes, that act as a one way valve for electricity. If a diode shorts out, the current can flows backwards to the alternator, since it is wired directly to the battery. The energy from the battery can heat the alternator until the battery dies completely and then the alternator cools as well. So, by the time you go to start it, nothing happens, but when you charge the battery, it works - until you shut it off for a day or two. It can be a tough mystery to solve!

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