Generac 10 k battery charger installation at the generator, where does the ac input wires connect

Need to change the flux capacitor.

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

You need to pull in two yellow wires called N1 N2 for sensing 220v. One red and one white called 23 and 194 those are your 12vdc transfer wires. And then last of all your 12vdc from battery charger. Hope this helps

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.....

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.

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.

Sounds like the electritian wired something wrong. Control wiring for that generator should be:
N1 and N2 = 240 vac utility input
Wire 0 = ground
Wire 194 (15B) = + battery
wire 23 = transfer signal

just 4. I install generac switches and generators

generac was purchased by Briggs Stratton some years ago, however some information is available at the following web address, just enter your model number:

http://www.generac-portables.com/service_support/owner_manuals/owner_manuals.cfm

The small board that you describe is the bridge rectifier that converts ac from the windings to dc for the armature. You can test the brush/board by removing the part from the generator and applying 12 to 16 volts ac to the input tabs/wires then test/read dc (dc voltage will be lower than input ) voltage at the brushes. Use meter to make sure that you are getting dc. I use a small power supply less than one amp that I purchased at the thrift store for a couple of dollars. If test fails replace part. If it tests ok re-install brushes and re-connect the ac power supply to brush/board which in turn will energize the armature. At this point test the armatrue for magnetic power. I use a thin welding rod or wire against armature. If you feel a magnet start the engine. If the windings are good you should get some voltage at the plugs and the two wires that feed the brushes (will not be full voltage). If voltage is present, kill engine and disconnect ac power supply and connect the original wires to brushes/board and start engine. If you now have voltage at plugs you spiked the system indirectly by energising the armature. If still no voltage you may have an open circuit that feeds the brushes or diode pack is failing with the incresased voltage. Good luck with your repair and email if you have questions.

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