Hi Playbyte
The install sounds OK, red to red and black to black or Pos (+) to Pos (+) and Neg (-) to Neg(-), this will give you 12 volts DC at the rated current of both batteries, so assume that you have 2 x 85 Amp/Hour batteries you should have approximately 170 Amp/Hours worth of supply.
Do remember that batteries do not like to be run down flat, so if you can get a multimeter and read the voltage of the batteries without the charger and they should be above 11.5 volts, if they are much below this they will be decidedly sick and probably will need replacing, lower than 10 volts and you need to go shopping for some new ones I am afraid...
I do hope that you manage to recharge your batteries but if you are in trouble please feel free to PM me as I will be having a couple of virtually brand new 85 Amp/Hour batteries to sell very soon as I am upgrading the batteries on our RV to 110 Amp/Hour ones.......
Good luck
Keith
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