My standby generator is just cranking but wont turn all the way

Question edited for a lot more clarity. Model and KVA helps.
Question moved from Televisions to Generac Guardian category.

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On auto start, unit sputters and I smell gas. On manual start ...

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The current models of automatic standby generators will have LED indicator lights on the side compartment of the generator. A green LED light will indicate that the unit is in AUTO mode and is ready to run, or is running properly during a utility outage. The yellow LED light will indicate that maintenance is needed. The red LED will indicate either that the unit is switched to OFF or that there is an alarm detected. If a yellow or red LED are present, you will need to check the generator's control panel, as it will describe the type of maintenance needed or the alarm present. This information can be found in the owner's manual as well. You can find a copy of the owner's manual online by searching the model or serial number of the unit here
http://www.generac.com/service-support/product-support-lookup

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.

the largest contactor they make is 50 amps!

THERE SHOULD BE A LOW OIL SENSOR ONTHE SIDE OF THE MOTOR PLEASE MAY CAUSE THE MOTOR NOT TO START YOU SHOULD BEABLE TO JUMPER THE TWO WIRES ON THE SENSOR AND SEE IF THE GENERATOR WILL START

The battery could be bad. Try to measure the battery voltage when you try to start. If the battery is bad then the voltage will drop quite low when the battery is loaded with trying to start the set. If you can borrow a similar battery you could just try with it.

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.

the instructions says the voltage regulator is automatic/digital. when you check the voltage is there any load on the generator? if applying load to the generator doesn't help, you can manually change the motor speed where the governor connects to the carborator, but it may change the frequency, but the regulator may fix it