Marathon Electric MAGNAMAX

Questions and Answers

S
Sheila RichardsAug 2, 2025
How to troubleshoot no voltage on Marathon Electric MAGNAMAX?
- A
  Alyssa GuerreroAug 2, 2025
  If your Marathon Electric Portable Generator isn't producing voltage, or only shows residual voltage, several issues could be the cause: * A blown regulator fuse: Replace the fuse. * Voltmeter is off: Ensure the meter phase selector switch is not in the off position. * Defective voltmeter: Verify the panel meter's operation with a known accurate meter. * Incorrect connections: Double-check all generator connections. * Defective connections/wiring: Inspect wiring for grounds, open circuits, and short circuits. * No regulator input: Measure the voltage at the regulator input (PMG output). * Defective diodes, surge suppressor: Test the generator with constant excitation (12 volt battery test).
J
jonathansteeleAug 6, 2025
What to do if my Marathon Electric MAGNAMAX Portable Generator has low voltage when load is applied?
- L
  Lindsay CraneAug 6, 2025
  If your Marathon Electric Portable Generator shows low voltage when a load is applied, consider these potential causes: * **Overload:** Check the amperage and confirm that the load doesn't exceed the generator's nameplate rating. * **Defective ammeter:** Test the ammeter's operation using a separate, accurate meter. * **Droop circuit:** If equipped for paralleling, some voltage droop is normal as load increases. If these aren't the issue, continue troubleshooting for symptoms of 'Generator Produces Low Voltage - No Load'.
C
Charles NelsonAug 14, 2025
How do I fix high voltage output on my Marathon Electric MAGNAMAX?
- S
  Sherry AlvarezAug 15, 2025
  If your Marathon Electric Portable Generator is producing high voltage, the following could be the cause: * Defective Voltmeter: Verify the operation of the panel meter with another meter known to be accurate. * Incorrect Operating Speed: Verify the speed with a tachometer or frequency meter. * Incorrect Connections: Verify the generator connections. * Defective Connections / Wiring: Inspect all wiring for grounds, open circuits, and short circuits. * Diode Polarity: Check diodes, verify proper diodes are installed and polarity is correct.
J
Joseph AyalaAug 19, 2025
Why is the voltage fluctuating on my Marathon Electric MAGNAMAX?
- K
  Karen VangSep 12, 2025
  If the voltage on your Marathon Electric Portable Generator is fluctuating, check these potential causes: * Incorrect Speed: Verify the speed with a tachometer or frequency meter. * Unstable Speed: Verify governor stability. * Defective / Loose Connections: Inspect all wiring for loose or dirty connections. * Defective Diodes, Surge Suppressor or Generator Windings: Test generator with constant excitation (12-volt battery test). Check operation.
T
Thomas CastroAug 25, 2025
Why does my Marathon Electric MAGNAMAX build voltage then go to low voltage?
- D
  David BallAug 25, 2025
  If your Marathon Electric Portable Generator builds voltage upon startup but then drops to a low (residual) voltage, it could be due to the regulator's protective circuit operating.
D
Dominique Perry PhDAug 27, 2025
What causes a Marathon Electric MAGNAMAX Portable Generator to shut down when warm?
- I
  igarciaAug 27, 2025
  If your Marathon Electric Portable Generator operates fine when cold but shuts down when it warms up, it may be due to the regulator shutting down due to over temperature. Correct cooling problems.
T
Tracy BradleyNov 9, 2025
Why is the voltage low on my Marathon Electric MAGNAMAX Portable Generator when there is no load?
- M
  Melissa HutchinsonNov 9, 2025
  If your Marathon Electric Portable Generator has low voltage without any load, it could be due to several reasons: * **Under speed Operation:** Verify the correct speed using tachometers and/or frequency meters. * **Defective Voltmeter:** Check the panel meter's operation with another meter known to be accurate. * **Residual Voltage:** Disconnect the F1 and F2 leads at the voltage regulator. * **Incorrect Generator Connections:** Verify the generator connections. * **Defective Connections / Wiring:** Inspect all wiring for grounds, open circuits, short circuits, and loose and dirty connections. * **Defective Diodes, Surge Suppressor, Generator Windings:** Check exciter field volts. * **Voltage Regulator not Operating:** Test generator with constant excitation (12 volt batter...