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Stand by generator generac model #0058751 guardian series troubleshooting

Display shows low battery and the built in charger should be charging the battery. How can I correct that problem?

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6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

CarlGehrke
  • 169 Answers

SOURCE: Generac Guardian 17.5KW Generator dies

If this is one of the big "taco cart" portables you need to check that the vent on the gas cap is open when you're running the engine. In the center of the gage on the gas cap is a little knurled knob, turn it counter clockwise (lefty loosey), about a half turn or so and run the generator.
If that doesn't solve your problem add to it here, otherwise please give me a rating I'm trying to build a little credibility here and could use the help.
Carl

Posted on Dec 02, 2008

CarlGehrke
  • 169 Answers

SOURCE: Generac Guardian 15kW Generator

That sounds just about right, if the relay contacts get welded together it sometimes takes out the driver on the printed circuit board. As you found out, 12vdc from 23 to 194 makes the transfer switch move to the Generator position, relay not energized makes the ATS move to the Normal position.

You can make a nice test function by installing a 10 amp contact switch in series with either the N1 or N2 terminals. When the switch is open the generator thinks the Normal power has failed.

Regards,
Carl

Posted on Jan 26, 2009

CarlGehrke
  • 169 Answers

SOURCE: 20KW Guardian Generac does not produce 12 volts to run engine

The problem is that the printed circuit board inside the generator draws a little current from the battery even when the generator is not running. Over the course of a few days this can make the battery weak enough to be unable to get recharged by the built in running charger which results in not enough power to run the electronic governor on the generator. Usually the spark plugs will work even with a fairly low battery.

Most of the Generac generators come with a built in trickle charger that runs off of the transfer switch load terminals. If your built in charger isn't doing the job it's either broken or you have the wrong sort of battery installed in the generator.

Regards,
Carl

Posted on Jan 26, 2009

  • 384 Answers

SOURCE: 10kw Generac Guardian not cranking, shows rpm sense loss

Sounds like Generator mode switch should be "ON".

Posted on Sep 08, 2009

  • 37 Answers

SOURCE: Generac 10 k battery charger installation at the

Your electrician should have run a set of wires out to the generator from the transfer switch. The unit actually comes with a fuse holder, fuse, terminal connector, and jumper wire for installing these wires to the t1 or t2 terminals in the transfer switch. The dc wires will be the ones coming out of the battery charger, 1 of them will have a red marker around it, that is your dc positive. The 2 wires coming out of the opposite side of the battery charger is actuall your ac connection.

hope this helps let me know.

Posted on Dec 03, 2009

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1 Answer

Generac troubleshooting


Your battery is dead..If the controller has a visible display your battery charger is most likely OK. Just put in a new Group 26R battery and set the time etc.

Sep 07, 2014 | Generac Guardian 20kW Model : 5875

1 Answer

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yes
but battery charge voltage has to be 14.5-14.8 volts to charge a battery
batteries are known to be 12 volts but in fact at 2.2 volts a cell they are 13.2 volts capacity so 13 volts will not charge a battery

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Guardian 15000 Watt Portable Generator will not charge the 12volt battery. Help


Suggest you go to Amazon.com and do a search for the Generac Guardian. When you find it, look in the product details and you will see Product Manual (PDF) under the Product Details.

http://ec1.images-amazon.com/media/i3d/01/A/man-migrate/MANUAL000031765.pdf

it has a troubleshooting guide located on page 19.

No Battery Charge DC output.



1. Battery posts are corroded. 1. Clean battery posts.

2. Battery cable is bad. 2. Replace cable.

3. Battery is defective. 3. Check battery condition; replace if

defective.

4. Receptacle is bad. 4. Contact Authorized Service Facility.

Hope this helps!

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1 Answer

Battery does not stay charged on my 20kw generac generator


WAS A 110 VOLT CIRCUIT RAN TO IT FROM THE NORMAL UTILITY POWER OF HOME OR BUILDING IT FEEDS?
NORMALLY THIS IS DONE IN A SEPERATE CONDUIT FOR CONTROL WIRES.AND THE FEEDERS ARE IN ANOTHER CONDUIT.
WITH A DIGITAL TEST METER,CHECK FOR 120 VOLTS AT THE BATTERY CHARGER IN THE GENERATOR CABINET.USUALLY THERE IS A RECEPTICAL TO PLUG THE CHARGER INTO.
IF VOLTAGE IS PRESENT AT THE BATTERY CHARGER AND INDICATOR LIGHTS ARE ON, CHANGE METER TO DC AND CHECK FOR 13.8 VOLTS OUTPUT FROM THE BATTERY CHARGER.IF YOU HAVE OUTPUT VOLTAGE TO THE BATTERY,AND IT IS DEAD,CHANGE THE BATTERY..

HOPE THIS HELPS YOU,BEST OF LUCK.....

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2 Answers

I have a 10 KW Generac Guardian Stand By withe a prwired EZ transfer swithc. Everything works except the 12 volts battery charger. What could be the problem. Only have three weeks innstalled.


Your generator is equipped with a battery trickle
charger that is active when your unit is set up for
automatic operation. The trickle charger is
designed to help extend the life of your battery by
maintaining the battery when the unit is
not running.
you will need to review which circuit bord controls this and have that board replaced or serviced some of these gen heads have this built in and it will be the rectifier in the gen it self it will be a black 1x1x3/8 inch with a mounting hole in the center and 4 lug post for the wires replace this and your issue should be solved but consult your dealer for witch unit you have as to a control board external or the built in rectifier hope this helps.

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1 Answer

New Generac Generator--Battery Goes Dead


Yes,if its working correctly,you should be getting a reading about 2.5 to 3 volts above the battery voltage rating while its in standby mode.

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1 Answer

How can the battery charger be changed?


Yes this is a very simple job to do. there are only 2 small bolts holding it in. Make sure the generator is in the off position and removed the 2- 5amp fuses in the transfer switch for N1 and N2 Use a fuse puller designed for this (you can get at home depot or lowes for around $9-$10) not a pair of pliers or screwdriver, etc... there is 240VAC on these fuses.. N1 and N2 are what ultimately feed the transformer in the generator which steps the voltage down to 24-26 VAC and feeds the battery charger. Other than that its fairly simple, let me know if you have any more questions.

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1 Answer

Over charging? blew up battery


Battery charger should be putting out between 12.5 to 14.5 VDC...Battery blowing up is typical in that generator because it is on a constant trickle charge and the battery will go dry faster than normal. Make sure you check battery level every 6 months and replace every 2 years.

Oct 04, 2009 | Generac Guardian 065795 - battery charger...

1 Answer

Generac 20kw - new battery dead, twice. is there a problem?


if this is a standby unit. there is a charger built into the control box. check the fuses. if it still blows the d\fuse you can install a float type charger available from most auto parts stores. make sure there is power comming in from the bldg breaker box.

Aug 10, 2009 | Generac Guardian 065795 - battery charger...

2 Answers

20KW Guardian Generac does not produce 12 volts to run engine


The problem is that the printed circuit board inside the generator draws a little current from the battery even when the generator is not running. Over the course of a few days this can make the battery weak enough to be unable to get recharged by the built in running charger which results in not enough power to run the electronic governor on the generator. Usually the spark plugs will work even with a fairly low battery.

Most of the Generac generators come with a built in trickle charger that runs off of the transfer switch load terminals. If your built in charger isn't doing the job it's either broken or you have the wrong sort of battery installed in the generator.

Regards,
Carl

Jan 11, 2009 | Electrical Supplies

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