onan Micro Quiet Generator

Very nice! Well done and positive attitudes to boot :-)

Yeah it was in the harness that goes from the circuit breaker to the junction box before it goes into the RV. The harness is about 3ft long

ashlatz wrote:
Well I think I finally have some good news . Looks like the black wire going from the breaker to the junction box is shorted out.

Congratulations. That was a tricky one to find - it wasn't in your gen, it wasn't in your ATS and it wasn't in the RV.

Good job drycamper and op.

Well I think I finally have some good news . Looks like the black wire going from the breaker to the junction box is shorted out. What I did was Leinster the wire from the system and run another wire to the junction box and circuit breaker. Once I did that everything worked great . I couldn't of done this with our everyone's help thanks so much for pointing me in the right direction.

Ok disconnected the breaker today took my meter and measured across the two tires going to the generator. I got 120 volts. I than took my meter and with the circuit breaker disconnected I measured from the white wire to ground and got 120 volts than I did the same with the black wire and got zero volts. I am no electrical genius by any means what should I do.

ashlatz wrote:
Ok for me to measure that I have to undue the 2 screws on the breaker correct. Than measure those 2 wires. I am assuming that it's a black than I white wire. It's kinda in a hard spot to get at. Could I possibly measure the 2 wires from the junction box near the generator where I have been in before

You can get access to the neutral at that box, which should be white. Put one lead of your AC meter on the white wire there. The hot lead, however, is connected to the circuit breaker, and you said if you turn on the breaker CB1, the gen dies. You'd need to put a meter lead on one of the two leads at CB1. One of those leads should be hot when the gen is running and the other should be hot only when the gen is running and CB1 is turned on.

Ok for me to measure that I have to undue the 2 screws on the breaker correct. Than measure those 2 wires. I am assuming that it's a black than I white wire. It's kinda in a hard spot to get at. Could I possibly measure the 2 wires from the junction box near the generator where I have been in before

ashlatz wrote:
Ok came home and ran the code. It's code #27

What should I do next? Thanks for the help

I assume you have a gasoline model. FC27 is no AC output voltage. Almost all Onans shutdown when no AC is produced. Here's the official troubleshooting guide, but basically, you check to see if you've got AC, and if not, you figure out why not. I still don't quite understand what the breaker has to do with this unless you've got an overload caused by a short. You'll notice that "Genset load" is actually the first listed possible cause below. We're back to one of the first things we discussed - verifying that the gen is producing AC. Turn off the breaker, start the gen and measure voltage between the breaker hot and gen neutral. It should be around 120 VAC.

VOLTAGE SENSE LOST – FAULT CODE 27
WARNING Some genset service procedures present hazards that can result in severe personal injury
or death. Only trained and experienced persons with knowledge of fuels, electricity, and machinery
hazards should perform genset service. See Safety Precautions.
Logic: No Sense Voltage (0 VAC across S1–S2) for 1 continuous second after start disconnect
Possible Causes: Genset loads, Inverter/Charger, VAC sense transformer, engine governor function, fuel
supply, choke, demand regulator, carburetor, generator windings, ignition, wire connections, temperature

Diagnosis & Repair:
1. Verify that Last Fault is FC 27: Yes, continue diagnosis; No, troubleshoot actual last fault.
2. Measure AC voltage.
3. Determine battery charge rate (typical default is 80 percent): if adjustable reduce to 30 percent.
4. Disconnect genset control P1 connector, verify P1 pins are fully inserted and inspect pin condition per
PSB–676: insert, repair or replace pins as necessary.
5. Reconnect P1 connector and test run genset for fault occurrence: repair or replace pins in connector as
necessary.
6. Check air filter cleanliness; replace air filter as necessary.
7. Check for blocked or damaged exhaust system: repair or replace exhaust components as necessary.
8. If the genset will not stay running measure genset frequency, quadrature winding and main winding voltages
using Break-Out Tool 420–0603 and Instruction Sheet R1098.
9. Gasoline Models
A. Under high ambient conditions or heat soak conditions vapor lock may occur, operate less than
120°F; verify proper installation to prevent air recirculation; correct as necessary.
B. Verify steady DC voltage at fuel pump while genset is running; repair wiring, verify proper installation
to prevent air recirculation as necessary.
C. Run genset on shop fuel supply; verify tank level and fuel line condition in vehicle.
D. Verify carburetor altitude setting; readjust as necessary.
E. Verify choke operation, setting and linkage damage; readjust, repair or replace as necessary.
F. Measure throttle stop frequency; readjust as necessary.
G. Measure fuel pump pressure/flow: replace fuel filter or pump as necessary.

Ok came home and ran the code. It's code #27

What should I do next? Thanks for the help