Rolling Condo wrote:
If you haven't. Definitely clean battery connections.
Not just the battery connections, but ALL connections between the battery and the starter ! This does mean removing the cable at the starter
(AFTER removing the cable at the battery) and thoroughly cleanly all connections with a wire brush and/pr sand paper.
If you don't have a meter, buy one, even a Harbor Freight cheapy. With someone else behind the wheel, put your leads on the battery and have them start it. Record the lowest voltage. Repeat the same test when hot.