Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hi my name is Chad. I'm going to try and see if I can help you with this.
First I need some background information on a few things. When you try yours, and it doesn't work, do you do you try your brothers right away or is this at different times of the day with different outside temp and/or in a different location? (It make a difference that I'll explain in a bit)
Also to make sure where comparing apples to apples, are you using the exact same power cord for both generators? Also, do you know how many BTU's your a/c unit is? Or even better the make and model number so I can see what the rated amp draw for the unit is?
OK. I see now. It was working and now its not.
Do you have any output from the generator at all? If you plug something in to the outlet, like a drill or light, will it power it? Or is there no output from the generator at all?
When you say the breaker is kicking out, is it the breaker on the generator or in the camper?
Also before the breaker kicks out, does it sound like the engine is struggling or bogging down?
There are any number of reasons. Differences in manufacturing, age/hours on the unit, ect. You have said yourself that yours will work until you plug into a longer cord. That tells me 100% that there is a voltage drop causing high amperage draw when the A/C tries to start that causes the over current condition that is causing the breaker to kick.
To go any father with this, I really need to know the two about questions about the eco-throttle and the multi-meter.
Another thought is this. How old is the gas in the generator. If you have older gas in the tank, it is possible that the fuel doesn't have the same BTU (or power) content as the fuel in your brothers unit. I've run into this before. They will run, but don't have the power to start heavy loads. Not saying that is it, but its just a thought.