OP here: The breaker for this circuit is 20 amp. But who knows what kind of wiring runs from the panel to the outlet? The house was built in 1960. So I have to assume, I think, that the capacity of the circuit is no more than 15 amp.
I think the extension cord I am using is 10 gauge -- I do not see any markings on it. I bought it several years ago at Lowe's.
And yes, the a/c started up, quit, and then re-started on its own. I did not let it do that more than once -- as soon as it did this, I turned everything off. It was obviously not a good situation -- I was not going to let it just cycle on and off and burn out.
There is nothing else running on this circuit, and there is nothing else running in the trailer.
In order to diagnose the problem and to see if there is any hope of running the A/C at home (with a heavier cord and/or a dogbone adapter), it's clear that I will need to check the voltage. Is that something that can be done with a standard multi-meter?
I am used to checking the voltage of my battery by putting the two leads on the terminals. Is checking the voltage of a circuit something that a non-expert can safely do? Do I need to check it while the a/c is running?
Thanks to everyone who has posted suggestions -- much appreciated.
