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You can jump the load side of the starter relay (30 and 87) and see if the starter cranks the engine…if it does than you have a control issue…you can start there…what is the “passenger ground strap” ??…and you sure the battery is good even if new ??…is it between 12.66 if lead acid or 13 volts if AGM ??…if you think it’s a battery ground issue connect one cable of jumper cables to battery negative and the other cable to the engine block.