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I can’t tell you guys how dumbfounded I am that I just found this post (9-22-2020). I have been all over the Internet and have spent countless hours of frustration chasing possible fixes on my quad : 2014 Suzuki king quad 750 power steering. I’ve owned it for 3 years and have tried everything to get it to stop STALLING Thanks to Mkibbe for posting that his friend told him to disconnect the ground wire coming off the wiring harness and going to the rectifier as pictured. My KQ has not stalled since.

P1619 is just related to oil change. Looks like the throttle cable housing is just broke so i'm sure replacing the cable will resolve it. But that's just a guess.

Yes I found my problem with the thanks of a good knowledgeable friend all you need to do is unplug this ground under the seat,for some reason with this plugged in its grounding out the system.....

I would suspect the voltage regulator or the alternator. There's also the possibility the power steering is drawing too much power for some reason and the momentary voltage drop is causing the ignition or fuel injectors to cut out. When you have the motor revved up the alternator is putting out more power so you wouldn't get the large drop and cut out. I don't think it is the ECU.

Thanks for your comment,Yea I put bumpers, pro armor and aluminum products skids,Elka shocks,ect,ect......here's a few more and my other toy.......how do I check my voltage regulator......