I’ve fitted a battery to the J35, but it’s not being detected in the JHub App?

Check the following:

1. The battery connections are tight and not loose or corroded.
2. The battery polarity: the red lead is positive and the black lead is negative.
3. The dealership fitted in-line fuse with the caravan battery is fitted and not blown. The correct value is 40A.
4. The battery fuse on the J35 is fitted and not blown. The correct value is 40A.