After a bit more trouble shooting, more info:
The system has a high pressure pump with two motors. Using an ampmeeter, we measured 14.7 amps on one, 19.7 on the other (12v). They are on a 35 amp circuit breaker. That flips after about 10 minutes (after making more than a gallon of good water).
The membrane was new 3 weeks ago. It was tested the day we bought it, but at the store, not in our system. As soon as it was installed in our boat, it had this problem. And we have been running in a little bit every other day to make sure it does not sit idle. So I am assuming it is not the membrane. Maybe I am wrong?
The system worked OK for the previous owners, but they had not used the watermaker
in quite a while and had not pickled the membrane, so we bought the new one.