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Always start with the batteries and cablesl. If the batteries are over 3 years old there is a good chance they may need replacing. Load testing is the only sure way to tell. Dirty cables with heavy corrosion can be a problem and a dirty ground to the chassis as well. Let me know about the battery wiring and attach a photo of that to your post if you can so I can see what you have there. All follow ups are included in our fee.
Just checking back in to see if perhaps you missed my earlier response to your question here? Please get back to me if we need to dig deeper into the problem or if you were able to resolve this issue. Thanks!