yamaha EF 1000is stalls under overload

[wtcmedic911]

Hello
  just purchased a  used yamaha EF 1000is generator. its in fantasic shape. so its mint.  however its doing something it shouldnt.  when it reaches an overload because i have too many things on it.  its little over light blinks some and it dies.  the engine stops.  according to the previous one i had and in the handbook it is to continue to run however there is no a.c. output until the engine is stopped and restarted.
  what id like to know is this.
   1. whats doing this? how is it able to kill the engine?  plunty of oil not does the oil light come on or flicker.  its like an off switch being thrown.
   2. will using this generator and at times close to overload cause further damage? what componant could be replaced to make this function as the manf. desires?
thank you!!!

[robertbruce]

Did your previous unit continure to run after an overload??

The manual does say they do continue to run after an overload but my engine cuts out...Mine increases in revs during the overload but it cuts out a few seconds after....

Your oil switch is blinking on and off, check the wiring.... on mine, the main AC wire from the generator part of the motor broke at the connector-plug, was a easy fix... Also, the ignitian wire is too short and sometimes loose....and also it would pay to remove the cover and check all the wires and connectors and grounds were sound.... Also on mine the throttle body connector doesnt clip in convincingly although ive had no issue with it...at least you know the oil-sender unit is working and dont have to split the case and crank for that....

[wtcmedic911]

Yes, previous unit runs after the circuit breaker has tripped. yes, it will increase in rpms for a bit as there no longer is a load on it.
  with THIS unit everything acts as it should EXCEPT it kills the engine on overload.  im worried i could be damaging the unit as its puzzling why it kills the engine.  
  oil light doesnt blink nor should it as its full of oil. its the overload light that blinks as it should on a very heavy load.  
thank you
tom