When i hear that someone has just hooked up their batteries I always think wrong polarity. It is so easy to do. Sometimes the manf will put their battery terminals on opposite sides just to mess with you I think...
What I would do to make sure they are connected correctly is find the word NEG or the SYMBOL '-' on the battery case and hand trace those battery cables to the trailer frame ground connection that is very close to the battery terminals..
If they have been connected in REVERSE POLARITY order they will blow the in-line fuse that is installed right at the battery terminals and also the two REVERSE POLARITY fuses located on the 12VDC Distribution Panel.
Once you get all this confirmed then you can start looking at the other places for problems.
The proper way the two 12VDC batteries connected in parallel should look like this...
When all is connected proper you will have these readings using your multimeter. With the SHORE POWER TURNED OFF the battery DC VOLTS at the battery terminals should read 12.6-7VDC if the batteries are fully charged.
When your turn on the SHORE POWER the DC VOLTAGE measured at the same battery terminals should jump up to 13.6VDC telling you the on-board converter/charger is functioning OK and that the battery are connected correctly.
Roy Ken
