Question about Porter Cable 6,500 Watt Contractor Portable Generator #H650IS W

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This is for the Porter Cable H650IS-W-1 Contractor Generator. It has an idle/RPM control solenoid that adjusts to the load on the generator. I can see that the solenoid works because 9VDC applied to it activates it. The stop control switch seemed to test out OK with an ohmeter, and the wires leading to the solenoid are ok. So I think the problem is in the power being provided to the solenoid by the generator/alternator. Where can I find out the correct voltage and/or how to troubleshoot further?

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I do not think that your generator has a voltage regulator. The solenoid is for idle only when there is no demand (power being used). You can verify this by examing the governor spring /tension adjuster on the engine. Idle control switch on panel and the assembly board control the solenoid. When the assembly board fails generally the generator will function the same however there will be no idle. I have checked with Dewalt and parts are available however expensive. If idle is the only problem you may consider ignoring issue. If there is another problem with gen. please email.

Posted on Nov 13, 2010

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  • gmilo2 Nov 13, 2010

    Thanks, this generator was made in 2004 and does not have the GS-0663 ASSY BOARD CIRCUIT I as I see in the diagrams for this model out on the web now. There is a red wire coming out of the end of the alternator that connects right up to the 4 pin rocker switch/idle control stop switch, a wire that goes to ground, and then the other two pins are the two wires that go directly to the solenoid. I have yet to check the voltage at the red wire but I had checked it at the wires coming out of the switch before (assuming my testing on the switch was correct, I'd expect the measurement to be the same/low..)
    Doesn't that solenoid adjust the rpm to the load on the generator so that it isn't revved up any more than it has to? The issue I was having with letting it rev where it wants - is the voltage output was up over 150 I think. Plus it is very noisy.

  • John Trevino Nov 13, 2010

    The soleniod is for idle only. Try easy test. start generator engine and hold the throttle linkage or at carb so that you can manually govern engine speed. Hold the engine speed low and gradually open throttle, as you speed up engine you should feel the governor push against you (it should push very hard at high speed). If you do not feel this then could be problem with internal engine governor (or could be hanging up on solenoid). If you feel governor push against you then let go of throttle and adjust governor spring /adjusting tension screw or tab to correct rpm. What is correct rpm? Adjust governor spring until voltage reaches 115v or if your meter has rpm setting set to 3600 or if meter has hz setting set to 60 cycles. Do not turn on idle control during test.

  • gmilo2 Nov 27, 2010

    Thanks, I think the governor does push back but I'll check it. What should a tachometer cost me and where's the best place to get an inexpensive one?

  • John Trevino Nov 27, 2010

    I would not use tach. Get a digital meter that shows/measures Htz. That way you could adjust governor by setting governor at 60hz which converts to 3600 rpm. If gen is working correctly, at 60 hz you should produce aprox 115v ~ 120v. Good holiday



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