If you can, try plugging the camper into 110/120v shore power (electricty) for a few hours and make sure the small red 12v kill switch is pulled "out" so it is in the "on" position.
This should top off the camper battery and most likely solve the problem.
The main purpose of the battery separator is to save your truck battery from getting too low. If you run the camper battery too low, as soon as your truck is running the battery separator will open up, both bateries will be "seeing" each other, and I'm pretty sure the power from your truck battery will start to drop because the batteries are trying to equalize (the fully charged truck battery will start loosing power over to the low camper battery). Once this happens, the separator will think the truck battery is getting too low and close (in hope to stop charging the camper battery) and recharge the main truck battery. Then after a second the truck battery will get over the voltage point and the battery separator will open up again. This back and forth cycle will keep happening until the camper battery get a bit of a charge on it and doesnt have as much of a draw down effect on the truck battery.
Im not sure if this is the problem, but talking with customers over the past few years, this usually seems top be the case.
Hope this helps.
Feel free to call our service dept. (800) 242-1442 if you need further assistance.
Thanks
Stan The Man
--------------------------------------------------------------
I just returned from a week long trip Jeep to Johnson Valley OHV in the Mojave desert and found that the battery in the camper wouldn't take a charge. With the truck running, I check the battery monitor and it shows that it's charging, then I hear a relay click in the cabinet behind the monitor and the battery level goes back to weak. It then clicks again and it's shows charging. I looked around and can't locate the relay easily. I still need to take the battery down and have it checked. Has anyone else experienced this?