This block works quite well. I was walking out to start my truck one morning when I turned the key, no click, no crank. I turned on the light - nothing. I connected the charger to the battery and let it run for 4 hours. The charger didn't show me any error codes. So the IKnew battery was still good. When I ran a CCA (COLD PLANT) TEST WITH THIS TESTER IT TESTED WELL BUT AT 250A IT DOESN'T REACH ITS CCA RATING OF 800A. THE BATTERY IS ALMOST 5 YEARS TIRED AND NEEDS TO BE REPLACED.
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