I need to troubleshoot a voltage drop between my main breaker panel and the house bank. I'm losing about .4 volts, and maybe more momentarily when the amp loads go up.

I recently changed the batteries and I know the cable clamps are tight on the batteries themselves. I'm thinking I should start with the master switches and fuses, measuring voltage, removing each connection and refastening, then work my way out to the distribution blocks, doing the same with each connection (hot and ground).

Does anyone have any tips or tricks for doing this a better way?