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Generac 01815 standby generator firing the starter every 20 seconds although the motor is already running.

Update: I pulled the solenoid signal wire after the generator started to prevent the starter from running again. Generator ran for a couple of minutes before shutting down and throwing the "Engine fail to start" code. Update 2: I pulled the panel to expose the CMA board. I'm getting just under 3VAC at the CMA connector when the generator is running. It drops off to 0V when the generator stops.

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6 Suggested Answers


6ya staff

  • 2 Answers


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Posted on Jan 02, 2017


John McKinney

  • 42 Answers

SOURCE: wiring diagram for Generac engine on standby generator

here is a wiring diagram for that engine:


Posted on Mar 13, 2009



  • 79 Answers

SOURCE: No voltage output

It is possible that your voltage regulator is shot but before purchasing the volt regulator try flashing the fields first and make sure the brushes and rings are clean.

Posted on May 12, 2009


  • 52 Answers

SOURCE: Have to attach a red cable to a terminal on the

Some gensets have a reverse generator that actualy rotates the motor until running then switches back and produces power. But the starter could be in the front of the engine looking like a altrnator or some such device. good luck..

Posted on Aug 30, 2009

Bob Janelli

  • 26 Answers

SOURCE: Generac 43903 standby Generator overspeed indicator on starting

I have a generator that did the same thing. It would start and then stop within a few seconds. The more expensive generators have an oil level safety switch to prevent the engine from burning up. There is usually a wire connecting to the switch on the outside of the engine near the oil fill hole. Remove this wire and try to start the generator. If it runs without a problem then it is the switch. You need to remove the switch and take it apart carefully and clean it. There is a small float inside the assembly. When the oil runs low the float allows the switch to short to ground which kills the spark to the spark plug. Hope that helps.

Bob Janelli

I’m happy to help further over the phone at

Posted on Oct 01, 2009

Testimonial: "This is good information in the event that the low oil switch is part of the problem."


  • 25 Answers

SOURCE: generac home generator does not start

is this unit diesel or gas? If its gas driven, the carburetor needs to be removed and cleaned out. Also make sure your gas is fresh. If not drain fuel tank, remove carb, clean out, re-assemble & test. Check fuel filter, oil level.

Posted on Feb 11, 2010

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Do you have starter wiring instructions

Starter wiring on these are pretty easy, here are the following steps...

First, disconnect the battery first before attempting any wiring repair or replacement of electrical system components. I assume the old starter has been removed, so here are the steps to wiring on the new one.
First trace the generator wire (generally a 10 or 12 guage) wire from the generator. this wire along with your positive terminal cable from the battery and a wire which runs to the "light" pull switch all connect to the left side of the starter solenoid which i on top of the starter housing. This solenoid has "2" sides. With the bracket at the rear (towards passenger seat) the left side holds the three wires discussed above. The other side should be connected to the starter itself that has a bolt on the outside. This is a ground wire. If your starter didn't come with a new start solenoid, then this ground wire from the starter will go on the right side of the solenoid. Lastly, there will be a place to mount another wire to the top of the solenoid housing. This wire will run to the push button start near the gear shift on transmission housing. After all these connection have been completed, then reattach wires to the battery, and the tractor should start. If the tractor has been stored a while, may want to drain gas and replace with new for best start, and also check all the fluids such as water, oil, and the trans/pto/and hydraulic lift fluids.

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