Question about Northstar Generator 9 Hp, 5500 Watt, Gasoline

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Have a portacable generator. model BS1550 w Runs

Have a portacable generator. model BS1550 w Runs good but no power to plugs. circuit breakers are not poping out could they be bad.

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Breakers could be bad, but no power to all the plugs, including the 240vac plug indicates something else going on. Either residual magnetism has been lost (has it been a while since it been ran?) and needs to be flashed, capacitor or diodes in regulator are bad, or there has been damage to the rotor or stator. There could also be a problem with the brushes on the rotor as well.

Also, if engine is turning too slow, the alternator may not kick in as well. Make sure that you are turning either 1800 or 3600 RPM, though it is a little hard to do this without electrical output. You might try playing with the governor while a lamp with a sacrificial incandescent bulb is in it. If the engine speeds up, and the bulb lights, then governor needs to be adjusted.

Posted on Aug 25, 2009

  • bthomson739 Mar 11, 2011

    Fixed mine today, bad diodes. Diode #10A07 online for around $1 each

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Check for voltage on the side the stator wires feed into, then on le breake rload side. If you have no power either place breaker is good, if you have on one side only it is bad. If you refer to how to check if it can handle it's rated current you will need a load bank and apply rated load to the generator and see if it trips when it should.

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I have a briggs and stratton 8500/5500 generator which I am using to power an air conditioner on a camper trailer. I just recently started having a problem where the one circuit breaker keeps tripping when...


Hello, First figure out what the load per leg is on your generator. Are you using the 240 Volts because this is two 120 AC volts legs and they are 120 degrees out of phase with each other.

You will need to figure what the power factor is for each phase on this generator. To figure the power/wattage by using ohm's law. Voltage times Current will give you Watts. Example: If the generator is generator 240 volts the maximum current available is about 23 amps. The maximum current for 120 volts will 46 amps. Therefore, the maximum current per 120 volt circuit is 23 amps for one circuit and 23 amps for the second 120 circuit..

I would try replacing the circuit breaker with the same amperage breaker. Also, watch what the generator load is per circuit. You can install current meter for each circuit. This will give a good indication of which circuit is pulling more load than the other circuit. GB...stewbison

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