20 Most Recent Northstar Generator 18 Hp, 10,000 Watt, Gasoline Questions & Answers


check for a circuit breaker that is tripped, as well as a switch that enables 240volt (at the cost of 120 volt current being cut in half.). The switch puts the alternator windings in parallel (120volt full power) or series (240 volt @ half 120volt current).

Northstar... | Answered on Jun 12, 2010


  1. Check for any blown fuse and replace. It can be traced directly from the output lines.
  2. Check field excitation. The field excitation is supplied by the battery to the excitation coil through a pair of carbon brushes. If the brushes are worn out, no excitation field is supplied and no output is generated. Replace carbon brush if found worn-out.
  3. Use an analog multitester to check the continuity of the carbon brush and the field coil.

Northstar... | Answered on Oct 11, 2009


a voltage regulator that controls the field winding voltages

Northstar... | Answered on Sep 02, 2017


Did you try the capacitor wired up both ways around? They only go one way and there is no indication as to which on it.

If you still have trouble you need to flash it. Contact us if you need more info on flashing the unit (DO NOT USE A BATTERY OR MAINS TO DO SO!)

Northstar... | Answered on Feb 22, 2017


The RPM lowered should lower voltage, try it by hand, plug in the volt meter and push the throttle on top of carb with your finger ,should not take much .

Northstar... | Answered on Jan 17, 2017


squealing either bearing,bushing or winding going or gone if bushings or bearings might be able to repair if not to damaged

Northstar... | Answered on Aug 29, 2016


You cannot just buy that gasket, but will need to purchase a new Fuel Tap Petcock.

You can purchase it here: http://www.generatorguru.com/northstar/

Northstar... | Answered on Sep 25, 2015


the unit has gone into over load
The total power requirement has exceed the output of the generator
for example if the generator is a 2.500 kw or kva then it will generate well at 1.8 kva or kw but it will not run forever at 2.5 kva -kw
When a ac is running the power requirement will be constant on the generator and with the fridge as well then the load will be at the maximum out put of the unit.
when the fridge starts again the extra load will exceed the max out put of the generator and it will slow down ( lights dimming ) and eventually go into overload mode
have an accredited electrician calculate your maximum load requirement for an external power supply and then get a unit that is at least 15.. kva kw better that required
generally fridges use 1000watts , ac conditions will draw over 3000watts and any thing else adds up . I am guessing that your generator is only 2500 unit

Northstar... | Answered on Apr 13, 2015


If it has sat, it may have lost it's rotor residual magnetism. Disconnect the rotor field wires at the AVR or on the exciter/brushes. Note they are polaroty sensitive. Connect a 12V battery to F+ and F- (note polarity) and momentarilly power from the battery for a few seconds. DO NOT forget to disconnect the rotor/exciter field wires first or the voltage regulator will be damaged. If it hasn't sat check voltage regulator, rotor resistance, and stator resistance, and for shorts to ground.

Northstar... | Answered on Mar 01, 2015


Check for engine lock down due to sitting make sure it is free with plugs out. Check starter solenoid after you make sure battey voltage and battery are good

Northstar... | Answered on Nov 17, 2013

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