Yes, this is unfortunate, without knowing the internals of the 70mai it is difficult to determine the cause of this behavior.
Could you please use a multi-meter to ring the MR30 connector of the 70mai cigarette lighter power cable to check if the positive terminal and ACC are connected together?
If so, you can make it work by connecting the ACC wire from splitter to the 70mai input instead of the dash cam, which will then be powered by the original 70mai cable. (this should mimic the other option described below),
Meanwhile,
There is another way to make it work if the River3 12VDC output port can handle high current without triggering the overload protection:
- Power R3 from ACC activated cigar socket with XT60 splitter between power cable and R3.
- Reset the 70mai battery to high current mode, which requires a 3-wire input, positive, negative, and ACC.
- Power the 70mai from the River3 12VDC port (positive and negative), and from the splitter (ACC) to the 70mai input.
- Power the dash cam with the standard 3-wire harness supplied by 70mai, connected to the 70mai output port.
When testing do not unplug cigar socket to simulate ACC off, keep it plugged at all times for ground continuity, instead just turn off ignition or disconnect ACC wire if testing on the bench.
Hope this works.
