sp1353
Hello all, my generator is an older 2006 or so generac guardian 005240 model 16kw air cooled, lp gas. Unit has maybe 25 hrs on it, most of that is exercise runs. I have had the unit installed for about a year and exercised every week.

Notice it did not exercise about 2 weeks ago, Generator will make a click sound when in auto or manual mode, looks to be the fuel solenoid engaging,
Figured battery had went bad, went and had the battery tested, it tested good. Tried the battery out of the tractor as well, too large for the spot, but just to check, same results.
Pulled the started and it bench tests fine as well.
Back on the machine, no voltage to wire (16), but I can jump the starter solenoid and it will crank, no voltage from the starter contactor.
Ordered a new contactor and installed, still same issue.
Pulled the main board, do not see any bad components, even though most are surface mount and tiny, should still be able to see if one is blown. Conformal coating is flaking off, but all traces and solder joints look fine, cleaned and reinstalled, still same issue.

Meter on the start signal wire (56) to the starter contactor, will start to move but it auto shuts down within like a second after the click, so it never gets any voltage to the contactor. Wire (13) to the fuse shows 13.4 volts, as well as wire (15) on the started contactor.

Meter on wire (16) to the starter solenoid shows similar readings to the wire (56) it starts to show on the meter but the system clicks off before any measurable reading appears.

Before I spend the couple hundred on the new controller board (0G58840SRV) is there any other things to check, hate to buy a new controller and still have the same issue. Manual says that it should attempt to crank for 3 seconds before shutting it down due to an rpm no sense, mine seems to be shutting it down way faster than that.

I have not tried to jump the solenoid to crank the engine and place it in manual mode to see if it will even run, or possibly reset the board if it's doing something funny from the initial rpm no sense.

Thanks for any help,
Shawn
Quote
Peddler
Check the ground at the starter relay and make sure it is less than 1 ohm.  Make sure you have full battery voltage at the relay on the 15 wire.  I would jump 15 to 16 and see if it cranks.  Make sure the ground wire is tight where it attaches to the block.  Lastly you can pull the 56 wire off the relay and jump battery voltage to that post which removes the board from the cranking circuit, if the unit cranks then trace the 56 wire back to the board and if continuity is good the board is bad.
Quote
sp1353
Thanks Peddler, checked all the grounds and they look good, unit will crank jumping 15 to 16 and also applying 12 volts to where the 56 wire goes, it does not run though. Storm came up on me so will have to trace the 56 wire back to the board and see if it is a good connection later.

Thanks for the help on the additional checks!
Quote
Peddler
So if the 56 wire test or ohms good to the board  you will need to replace it.  The reason it won't start is the board does not put power to the gas valve until it gets a crank signal from the coils and then the 14 wire goes hot.  You can jump 12VDC to fuel solenoid and it should start but is the board is bad the stepper motor may not work as well and it could run away.
Quote