Kohler Confident 5 generator only runs when Start button is held. Why is it dying when button is released?

Start circuit bypasses the resister which reduces voltage when running so as to increase amps for better fuel burn. Engine starts on 12 volts for hotter starting spark, but when start mode is released, voltage to coil comes from a circuit which has resistor in it somewhere, often inside a wire so you don't even know it is there. A break in that circuit will act as yours does.

You didn't specifiy which model Kohler generator ???

no 14vac coming from generator to control board.--cause can be regulator board on end of generator---dirty brushes or worn out brushes==b1 and b2 winding open that outputs the 14vac--my problem was blown regulator board

Check the oil pressure switch, and oil level first. Then check rotor brushes and rotor slip rings may need polishing. If the problem is still there check stator and rotor windings

Is there a fault?? All UL listed generators including Kohler are required to lockout on a fault on shut down. This really sounds like a problem with your 2-wire auto start connection between your automatic transfer switch and genset. RDT model automatic transfer switch it is the 2 middle wires on the green connector and terminals 3&4 in the generator. close to run and open to shut down. Any open at any time will cause the unit to shut down. The 12 will shut down instantly upon an open because your 5 minute cool down is built into the transfer switch.

whats is the model and ser # i will check my diagrams

Can't search for a manual without model, type, serial, etc numbers...

A few things to take a look at:

1) Oil level / pressure sending unit. This is normally bypassed as long as the start switch is pressed. When engine starts, and switch is released, engine will die if sending unit is defective, or you are low on oil.

2) Exhaust temperature sensors. Older units were notorious for burning these up.

3) Cooling Water Temperature sensor. These cause trouble often, but mostly due to water pump impeller being eaten away by galvanic action and not able to pump water as effecively. End result is water temp higher than normal, which trips the switch, which kills the engine.

4) Alternator (generator) output not as it should. If output doesn't rise to proper level within a few seconds of engine start, the engine will be shut down.

5) Choke not working as it should

6) Bad fuel, bad fuel pump, clogged fuel filter.

sounds like a relay should be latching one it has started

hi

try a new plug with the same heat range

bye

Flight systems can test the onan circuit boards. google them they will come up. First class operation my board was was checked out and back to me in about a week, They also sell new boards and deduct the 20 dollar bench fee if yours is bad and you buy a replacement from them.