Additional start ciruit for generator

Discussion in 'Automotive Electronics' started by dandy1, Jun 29, 2018.

  1. dandy1

    Thread Starter Member

    Sep 30, 2017
    Hi guys - looking for some advice

    I want to add an additional starting circuit to my generator by splicing into the original circuit
    here is the wiring

    the genny is outside the garage and that is controlled by its original circuit, so i want an additional circuit inside the garage to save the bother of going outside, especially because it rains a lot here, and im lazy.
    ideally i want both circuits operational (at least for stopping the genny) in case something goes wrong, i believe this is just a case of grounding the ignition control but hey - this is why im here!
    i have some 10a and 40a (5 pin) relays and some toggle switches which may do the switching or do i need something more elaborate?

    anyway thank for any advice
    Last edited: Jun 29, 2018
  2. JMW

    Active Member

    Nov 21, 2011
    You will need three circuits, Run, Start and Off.
    The Run circuit will be just an simple on/off switch some where. Depending on the generator, this may also be the stop circuit. On my B&S it is normally open, and shorts the magneto to ground when closed. For starting you will need a momentary switch to engage the starter solenoid. Shouldn't need to much if it is short distance. 12 guage should be sufficient.
  3. JMW

    Active Member

    Nov 21, 2011
    Ill make up a schematic and a materials list tonite
  4. Externet

    AAC Fanatic!

    Nov 29, 2005
    Many additional things to consider...
    The starting of the generator to happen automatically when mains is interrupted ? How long time wait for the power being absent to start ?
    Need mains sensing
    Need waiting timing
    Then for cranking... how long to crank ? If does not start, wait how long to retry ?
    Need timed cranking relay.
    Need repetition timing circuitry.
    How do you confirm the generator started and is running ?
    Need oil pressure sensor, or proper generated voltage presence circuitry.
    Another timer to shut off the generator after a period of time after the mains has returned.
    And a battery charger.
    If the generator runs out of fuel and stops... What actions are desired ? More circuitry
    And a transfer switch so the generated voltage does not find its way back to the power pole.
    When the mains returns, circuitry to reset the transfer switch...

    Plus whatever else not in the list. To be lazy, at some moment there has to be a lot of work to allow being lazy.
  5. grt5r

    New Member

    Jul 17, 2018
    Generator looks rather complicated... :(