Question about Watts Onan Portable Generator - 4000 , Model# 5500

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Onan generator service codes

2004 forest river regency rv has a 4000 onan generator that sounds like it wants to start but will not. It has a service code of 36. I have changed the oil, air filter, and made sure there is gas getting to the carb. But it still does not want to start. What else should I do?

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Check the spark plug and the ignition coil for good sparking.

Get the spark plug out, or with another spark plug connected to high voltage cable, outside the motor, the outer part of the plug connected to motor ground and see if spark is present at cranking.

Posted on Jul 01, 2010

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1 Answer

How to fix onan 4000 that will not stay running


Check the slips rings and brushes, check the stator and rotor windings for continuity and for shorts to ground. Check PCB plug connections. After that you need a new control board

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If it runs while start button is pressed but stops when you let go?
Check the rotor bruhes, slip rings are clean on the rotor. If you want to get deeper check and ohm the resisitance of the rotor, and stator both for continuity and ground shorts. Check plugs and wiring on control board. Failing that replace control board

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Have a onan 4500 watt generator on a bucket truck. i have no output at recepticles, can you help.


Onan units have a breaker switch on them that has to be in the right position or you get no power. Can't tell you for sure where it is on the 4500 but on the 4000 RV series it is tucked in behind the on board start switch

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1 Answer

Onan generator 2005 model hgjab-1038c rv generator will not keep batterys charged have to hook battery charger every time that generator is not running what should i check for this genator is in my 2005...


Go to the auto parts store and buy a "Battery Tender" solar powered, or get an electric trickle charger. Or install a battery disconnect for the period the unit is not in use; you can disconnect the battery.

HTH,
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Hi, The 4000 rv unit unit is equipped with full diagnostics, and is indicated by the status light blinking. The blinking sequence, blinks a code as to the fault. If your unit runs and the status light is on without blinking, it is either the circuit breaker on the genset or in your distribution panel that needs to be reset. Good Luck, this should Fixya!

Mar 02, 2009 | Watts Onan Portable Generator - 4000 ,...

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