question

I assume that you have also connected the dongle to the battery pack. If that is the case, check those cables, maybe with a multimeter at the smart dongle terminals (B+, B-) to double check that voltage reach the dongle.

If there is battery voltage there and the blue light does not start blinking, I would think you have a faulty unit, then take it back to the retailer for a new one.

If you have no voltage at the dongle terminals but the cables are correctly connected to the battery bank, check the inline fuse (if you have it) by screwing the fuse holder apart and take it out. Change the fuse if needed. If you do not have a fuse and no voltage reaching the dongle, try with other cables.

Thanks for this, very, very helpful.

It is possible I have misunderstood the instructions but I have followed them as outlined here, where the temperature sensor replaces the positive connector for the dongle.

The only thing that doesn't make complete sense is that in the Multiplus II manual the temperature sensor should be attached to the negative terminal. In the Dongle manual, it says to attach it to the positive.

I will try again tomorrow, leaving out the T-sense cable, using only the Dongle cables.

Thanks both, I connected the Dongle directly and it works..... firmware update done and I have all the info I need.

I will connect the T-sense tomorrow re charging temp compensation.

Thanks again.