Review on ⚡ Weego JSMT524 Marine & Auto Tether: 2-in-1 Jump & Charge for JS6 & JS12 by Mike Hicks

Circular DC coupler I think (5.5mm OD x 2.1mm ID) used on some accessories. leave nests. I have a DBPower jump starter and it plugs into the auxiliary socket. However, the power indicator does NOT come on until I jumper the chassis ground pins on the datalink connector when I am not in the vehicle. Tomorrow I'll try to use it and we'll see if the LED stays on after disconnecting the car battery. If I jumper the chassis ground pins I see power (12V) on pin 16. If this works on the car I can upgrade it to 5 stars. YMMV.