your chassis battery needs to be slow charged over night with battery charger.i had same problem with my 16 axis 25-2 2 times so i took it to inter state battery to have the battery checked .they checked each cell and they were all the same which means the battery is good. he then told me its half charged .he couldn't do a load test till its fully charged. before i would plug Mh in for a couple weeks thinking the batteries are being charged but its only the coach batteries.the relays for the chassis battery won't open to let chassis battery charge if its half dead.
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