RV Repair: Shore Power & Convertor, continuity check, infinite resistance

Question
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Followup To
Question -
I have a 1983 Pace Arrow. I bought it "as is". When I picked it up, the dealer was checking the Air Conditioner.  He had the RV on Shore Power. I got the RV to my church and the next day attempted to check the RV out. Using the adaptor which I received from the dealer, I tried to plug the RV in.  The circuit breaker on the outlet kept tripping (2 different outlets). What could be the problem? I've already replaced the Power Convertor (advised by manufacture), and still have the same problem.
Answer -
Ken,
   There could be any number of things causing your problem.  Does it trip as soon as you plug in?  If so make sure everything inside is turned off.  If the a/c is on it may be demanding more of a load than the circuit can provide.  Is it a gfci protected outlet you are plugging into?  If so, a common culprit is the heating element in either the refrigerator or water heater.  You need to use the shortest and heaviest extension cord available and even then you wont be able to use the a/c or microwave on most house type outlets.  They are usually on 15 amp breakers and can't support that large of a load.  Just the water heater on electric will pull 8 or more amps.  I hope this helps, good luck and happy camping.
Darren

Darren,
 It does trip as soon as the plug touches the outlet.  It is a gfci protected outlet.  I believe everything is turned off.  I also tried it with the circuit breakers off.  I'm using the cord on the RV.  What should a continuity check show on this cord.
Ken

Answer
Ken,
   If it trips when the breakers in the RV are off it sounds like it is probably in the cord.  With the breakers off you should read infinite resistance on your VOM between any two prongs on your cord.  With the breakers on the resistance would be determined by whatever was turned on in the unit that was completing a circuit.  

Darren