Hi and thanks for using 2CarPros.Com.
Based on your description, it sounds like you have a bad ground. What I suggest is to start simple. Make sure the battery terminals are clean and tight, the cables themselves are in good condition, and the ground from the battery to the engine block is clean and tight.
Take a look at this link. It discusses issues such as yours.
https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked
Also, here is a link that describes how to load test the battery. However, again it sounds like a loose connection.
https://www.2carpros.com/articles/car-battery-load-test
Let me know what you find or if you have additional questions.
Take care,
Joe
SPONSORED LINKS
Tuesday, July 31st, 2018 AT 7:04 PM