Bad batteries or current draw?

[sunny5280]

Checking total current draw is easy...turn everything off and place an amp meter inline with one of the battery terminals (start with the highest amperage rating the meter offers and work your way down).

If you want to determine the current draw of a particular circuit you can determine it by performing the above and then remove the fuse for the circuit of interest. Subtract the two and the result will represent the current draw of the circuit.

Do not attempt to start the vehicle with the meter inline.