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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14727
Experience:  Certified on Onan and Generac generators
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15000 watt generator runs but no output to main breaker

Customer Question

15000 watt generator runs but no output to main breaker
Submitted: 7 months ago.
Category: Small Engine
Expert:  Hank F. replied 7 months ago.

Hello, my name is ***** ***** I am going to assist you with this.

You did not give us much to go on. What are the brand, model and serial numbers of the genset?

Customer: replied 7 months ago.
Brand: Generac Guardian Ultra Source. Model:(###) ###-#### Serial #4726480
Expert:  Hank F. replied 7 months ago.

I have uploaded a test for you to do.

When giving me the results, give me wire numbers, not step numbers. IE - say "wire 2 to 6 gives 35 VAC", not "step 5 gives 35 VAC".

Do Test 4 - Fixed excitation/Rotor Amp Draw. Do all of the steps.

Click here to download the test.

Customer: replied 7 months ago.
Hank. I started to do the test however the voltage regulator numbers don't match
First I don't have a six pin connector just indivual wires from top to bottom they are 11s 22s
4 0. 6 162
When I hooked meter between wire 2 and 6 I got a reading of 1 volt.
In the test diagram picture you show a d2. I show a d1
Will wait for you to respond. Thanks. Tom
Expert:  Hank F. replied 7 months ago.

The 11S/44S is a misprint in the test. I can't believe I've never noticed that before.

But you do test across 11S and 22S.

Your unit should have an R1, which is a resistor, and a D2, which is a diode.

Customer: replied 7 months ago.
Hank. Wire 2 to 6 is 133 vac. Wire11 s to 22 s is 102 vac. Wire 14 to4 is .79 a do
Will wait for your response. Tom
Expert:  Hank F. replied 7 months ago.

What was the rotor amp draw?

Customer: replied 7 months ago.
Hank. The rotor amp draw is .79 amps dc
Expert:  Hank F. replied 7 months ago.

1. Remove wire 0 from the VR. Set your meter to ohms. Test continuity from wire 0 to the ground terminal in the control panel. It should read continuity. If not, the wire is broken.

Remove wire 160 from the VR. Remove wire 162 from the excitation breaker. Test the wire for continuity. If it is broken, fix or repair it.

2. Remove wire 16 from the start contactor relay. Remove wire 4 from the VR. Under the control box, disconnect connector C1 ( it has wires 0, 4, 162 etc). Set your meter to DCV. Connect the red lead to wire 4 at diode D1. Connect the black lead to a good ground.

Set the switch to START and note the voltage. It should have 12V.

3. Remove both wires from resistor R1. Set your meter to diode test. Place the red lead to the top terminal of the diode, and the black lead to the bottom terminal. It should read an open circuit. Now switch the leads around. It should read about 0.5V. If you do not get those readings, the diode is bad.

4. Measure resistance of the resistor. It should read about 25 ohms.

Customer: replied 7 months ago.
Hank. Wire 0 is ok
Wire 160 is 162 at vr and is ok
No wire 16 at scr so I took off wire 14. With sw in start mode no voltage
No doodle test on my meter any other way to test?
Resistor reads 24.1 ohms
Will wait for response. Tom
Customer: replied 7 months ago.
Hank. Sorry there is a wire 16 I had to get magnifying glass
Expert:  Hank F. replied 7 months ago.

There is no wire 14 at the Start Contactor relay. There is only 13, 15, 16 and 17. You need to leave wire 14 connected to whatever you removed it from. This test actually uses wire 14.

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