20A starter fuse on Indmar 340 Assault (5.7L) engine block keeps blowing, engine won't crank. Boat only has 75 hours on it. Removed starter and tested, operates normally. Solenoid draws 37A. Checked with a known good starter and it also draws nearly 40A on the solenoid side. No damage to engine wiring harness visible. Starter relay on engine clicks when key turned to start. Any assistance gratefully appreciated!

Barry