RV Generator Voltage Regulator References

Discussion in 'The Projects Forum' started by Dave3331, Jul 8, 2008.

  1. Dave3331

    Thread Starter New Member

    Jul 8, 2008
    I'm requesting suggestions for reference material on making a voltage regulator to replace one missing from a 4.5KW Kohler 4.5CM21 generator (it seems the generator was cannibalized before I bought the RV). New regulators are available for about $400, but I'm hoping there is a more reasonably priced alternative in making one myself. I have on backorder from amazon.com a book titled "Generators, Exciters and Voltage Regulators", but I don't know what's in it.
  2. Wendy


    Mar 24, 2008
    When you say voltage regulator, are you talking about an inverter? If not then what? I'm not too familiar with RV's
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    Do you have a schematic for the generator? It's probably self-excited, but there are several ways to skin that cat.
  4. SgtWookie


    Jul 17, 2007
    I found a schematic on this thread: http://www.smokstak.com/forum/showthread.php?t=20021
    I've attached it; unfortunately the resolution is very poor.

    What is the spec# of your generator?

    Here's a table of wiring diagram numbers depending upon your spec number.

    Wiring Diagraom Specification Number
    Wiring Diagram Cross-Reference
    Spec Model Drawing
    13900 4.5CM21 269154
    13901 4.5CM21 269154
    13902 4.5CM21 269186
    13903 4.5CM21 269186
    13904 4.5CM21 269154
    13907 4.5CM21 269186
    13908 4.5CM21 269154
    13909 4.5CM21 269186
    13910 4.5CM21 269186
    13912 4.5CM21 269186
    13915 4.5CM21 238749

    Source: http://www.westerbeke.info/kohler/lit/ES913.PDF page 60
    Last edited: Jul 9, 2008
  5. Dave3331

    Thread Starter New Member

    Jul 8, 2008
    I did find some more information, including the schematic from the smokstack site. I apologize for my original post being too early (I hadn't done enough yet with the generator and materials on hand before posting). I have an appropriate engine manual, and need to compare it more closely with the mostly complete generator. I thought I needed a "voltage regulator" because my cousin (who's a mechanic and has much more experience with RVs and engines) was working on the generator and called a friend of his for advice, and relayed that to me.

    Until I spend some more effort on this myself, the only thing I can ask from anyone here is if they are familiar with the backordered book ($10 at Amazon) "Generators, Exciters and Voltage Regulators", and could offer a brief review (I found no reviews or summaries of contents).

    Thanks again!