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There is no "accessory battery" or "engine battery", both are connected to the same loads in parallel. If you have a bad battery, both should be changed at the same time, as the weaker old battery will drag the new one down.
Apparently they didn't give the charging system a good check, although they may have tested the batteries separately. You can do a rudimentary check with a voltmeter. If you don't get 14+ volts at the positive battery terminal when the engine is running, your alternator isn't putting out the proper voltage.
Your problem may be with the alternator and not the batteries. Also, a proper battery test is done with a fully charged battery, not one that's been discharged.
You may want to take it to a REAL battery shop, not a chain retailer like Wal-Mart.
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First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version  ), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.
Hard or no-start? Check Here
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Linear Mode
