Please download the PDF below and perform,
1. Probe battery input for voltage
2. Pull car switch jumper and install it on the switch pins
Click link here - https://cdn.shopify.com/s/files/1/0277/4692/6626/files/RES-V3_troubleshoot_Zero_response_f13b16bc-4dfd-4e6d-ad47-6aacfae36418.pdf?v=1623681455