20 Most Recent Generac Guardian 065795 - battery charger rectifier Questions & Answers

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

Check the battery voltage before you start it at the generator. IE 12V start the generator and measure again. It should be around 13.8V if it does not rise, go to the charge rectifier in the genset and make sure you have AC going onto it. (Assuming you have the gen battery charge option) If you don't have ACV you can suspect the B stator windings, if you do have AC. Check the rectifier DC output 13.8V if present check wiring and fuses, if not present change the rectifier, note where the wires go ! The battery is dying because the ignition system of the gen is pulling it down and it is not charging.

sound like the crankshaft or oil pump may have issues I would go for crankshaft as this is where the oil pressure is created and once warmed up the oil becomes thinner and will escape from warn bearing easier

if you can find out the current it takes you can go online and buy rectifiers all day long they are pretty cheap too also you need find the type of rectifer like full wave, half wave, bridge rectifier. the bridge is usually the most common tho.

If the unit is using a wet cell acid battery, it's possible that dirt mixed with hydrogen build up on top of the battery caused the second failure. The battery top should be kept clean and should be checked at least 4 times per year. Any stray ignition source can cause the hydrogen to explode, including lightning.

It's also possible that the battery float charger needs to be adjusted or possibly has a problem. Some float chargers are adjustable. The higher the charging rate the more off-gassing the battery will experience and increase the chance of a failure.

If the battery has exploded, the entire generator and housing should be cleaned (washed) thoroughly to remove any remaining battery electrolyte (acid).

Be careful - if you aren't comfortable working on this type of equipment, it's best to call a local dealer and find a service vendor.

Replace the part. The part is not repairable if blown.

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.

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.

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.

I believe the charging circuit is part of the main controller board. The board controls the relay that cnnnect the battery to supply power for start and for charging. Check to see if the relay is good.

Unplug the oil sensor.
The oil sensor is located behind the oil filter. I unplugged the oil sensor and it fired right up. Plugged it back in and it runs fine.
It might be because it is cold.
I don't know why but I turned it off and it starts right up now.

The charger might be bad and you should get a new charger

Likely an extremely low or dead battery.