Optima Battery Problems

i currently have a yellow top (main) and a blue top (aux) in my 4runner. I've been having problems with my blue top keeping a charge for the past few months but never my yellow top. my blue top on has one outlet hooked up to it to power the fridge but the fridge is on in the truck for trips. never once have i had a problem starting my truck

the major issues started last night...

i picked up my truck from toyota walnut creek and once i picked it up they told me they had to jump start the truck (which is something i never have to do and the truck sits in my driveway for days at a time) they stated the checked the voltage and it came out at 12.7 volts so it was good.

with my truck running i drive away and go to napa auto parts a few minutes away. i parked my truck and go inside. when i come out to start my truck its completely dead. like no interior lights, alarm going off dead. (the alarm will go off if it senses the battery has been removed or in other words, zero juice) i go inside and ask for a jump and it took a couple tries because it wouldn't stay running. so i leave my truck running and decide to buy a battery charger to give the batteries a proper charge. i got home and hook up the charger to the main battery with the charger selected on the 12v 10amp auto charge. i leave the truck for 24 hours


fast forward to tonight. i come home and see the charger still charging, it appears its at 75% and still charging. i remove the charger and try to start the truck and nothing, same exact situation like at napa auto parts the day before. both batteries are completely drained. now i don't know what the hell is going on. I've been frustrated with my blue top for some time but my yellow top has never let me down and down the are both the pits!

can anyone help?

 

I would test both batteries and then the charging system including the isolator. Please see Sections 4 and 10 in the Car and Deep Cycle Battery FAQ on www.batteryfaq.org. You could have a parasitic load problem if the batteries and charging system test good.