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

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Have onan microlite 4000 generator (4kyfa26100b) on 1994 tioga montara...it will start but not generate wattage to run microwave. It will run a/c but not in high cool position. Had new carb, carb kit, fuel pump and filter put on it..no wattage...help

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Hello. 'll assume you checked the obvious things first; fuses, circuit breakers, cords, etc.
Use an ohm meter to confirm the windings are actually connected to the outlets. With the engine shut off (!) measure the resistance between the live and neutral lines. It should appear as a short circuit.

Here is something from my generator web page which you may want to try...
If the engine is working fine, but there is no output voltage try this trick. It may work on standard alternator type generators, but not on those which use an inverter. It worked for me in the past, but try at your own risk. First check to ensure that all circuit breakers and fuses are ok. Shut off the engine and remove any cords from the generator. Plug in a cord with bare wires on the other end to one of the 120VAC outlets. Connect one end of the cord to a car battery. Very quickly touch the other wire to the other battery terminal. Do not leave it there longer than to create a few sparks or you may destroy the windings. If the residual magnetism in the alternator had weakened, this may be enough to get it started again. J.

Posted on Aug 26, 2010

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We have a Valsi 5500 watt generator that isn't putting enough voltage out to run everything in out small travel trailer. It runs the lights but doesnt push out enough voltage to carry the A/C, microwave,...


How long have you had this generator?
Has the generator worked on all of these loads before?
Model 5500 is a 5500 Watt generator which could easily be 5500 watts (Peak) and not continuous.

Your AC is an inductive load.
Your lights are resistive loads

An inductive load can cause issues when starting due to an increased current demand at start up that some generators cringe under. Do the lights flicker or are they stable? I'd say your diodes on your stator are working if you have light stability but you haven't provided nearly enough information for a detailed solution.

I'm sure you have enough voltage but you aren't getting enough current to run specific loads. How many watts is your AC? How many watts for your microwave? Both of these units demand a great deal of energy to run and when you place too much demand on your generator, it will choke it out and eventually, will cause damage to the generator. You may consider getting a beefier generator with a greater amount of wattage output.


Seeing these specs online and noting what you are trying to run, you have an undersized generator and need to get one that can produce a greater amount of running wattage (as well as peak wattage).

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Onan microlite 4000 generator no output


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!

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