Hello,
This could be a problem with the ground straps coming from the engine to the body and the straps from the body to the negative battery terminal. There could be a loose connection and/or corrosion on the connections, and/or a damaged strap that is not allowing the current to return to the battery. In the diagrams down below I have included guides on how to inspect ground connections and a guide for measuring damaged parts of an electrical circuit, called voltage drop. You will need to use a Digital Multi-meter[DMM] for the later tests, so here is a link describing how to do that below, if needed:
https://www.2carpros.com/articles/how-to-use-a-voltmeter
Please go through these guides, inspect the ground straps, and report back here with what you are able to find out. We will go from there, if needed.
Thanks,
Alex
2CarPros
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Nov 1, 2019 at 10:41 PM
