01 caravan not starting, removing bat cable fixes

I have a 3.3L 2001 caravan that intermittently will not start. Lights come on etc. Some faint clicking from relay area but no turn over. Taking the battery cable off and replacing fixes the problem temporarily. I switched the relays around and this didn't help.
Any ideas?

Try cleaning the other ground wires as well. Batt neg to body, batt neg to engine, engine to firewall. If that doesn't help, then you have a power feed problem.