MagnaPLUSGeneratorTroubleShootingGuide(SP0023).docx12/27/2018TRS
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Trouble Shooting – MagnaPLUS / Mariner / Harsh Duty
MagnaPLUS / MARINER / Harsh Duty models are 12 lead, re-connectable, brushless, AVR regulated
generators. For simplicity, MagnaPLUS refers to all three product lines. A listing of models and
specifications is included at the end of this trouble shooting guide.
A MagnaPLUS generator is simple to trouble shoot with 6 main components: the exciter stator and
exciter rotor windings, a voltage regulator, a rectifier assembly, and the main stator and rotor
windings. For tools you will need a good multi-meter – a Fluke works very well – a ratchet set, and a
set of screwdrivers. You can make an analog style meter work as well.
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This trouble shooting guide addresses the most common causes of low or no output voltage, usually
15V – 50V as measured at the generator terminals, mounted on the linkboard located in the connection
box mounted on top of the generator.
Start trouble shooting in the connection box mounted on the top of the generator. It gives easy access
to the exciter stator leads ( F+ & F- ) and main stator output leads.
If your generator is equipped with a PMG Excitation Support system refer to the section on PMG
Powered Regulators on page 6.
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