Yep, this can be one of two things, either the battery is drained, or you have a bad connection at the battery, I would try to clean the connections the battery first which this guide can help with:
then load test the battery which you can do with no equipment by following this guide
If the battery fails let's install a new battery which this guide can help with, and I have included specific instructions for battery replacement in the diagrams below:
Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
Images (Click to make bigger)
Sunday, July 10th, 2022 AT 7:16 PM