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You said you load tested the batteries...You need to disconnect both batteries and load test each one with a Battery Load Tester. A battery can have a short inside...they will show full voltage until you hit the ing switch. If the batteries pass a load test with a load tester then you may need a...
http://www.steelsoldiers.com/showthread.php?66745-Dually-M1028A2-South-Florida-Rebuild&highlight=florida+dually
See post #62 and #63...just fixed mine last week.