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5.7l Black Scorpion intermittent starting

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06 Enzo SV230

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I have a 2006 centurion Enzo with the 5.7l black scorpion. Bought last week. Test drive went great, get it home and have intermittent starting issues immediately. Starter seemed to have a dead spot, put in a new starter, no change. Put in new slave relay, no change. Removed engine ground, cleaned everything up and put back together, no change. I seem to be getting correct voltage readings everywhere I check. What’s next? Is the new MercCruiser starter bad? I feel like I’m chasing ghosts.
 
Welcome
If you mean where you turn the key and the motor doesn't crank, than it's most likely the neutral safety switch in the throttle control. Turn key to start and move the throttle forward or reverse slightly, it should crank up
 
Changed the ignition switch, seems to help some, but not fix the problem completely. Or maybe dumb luck it seems a little better…
I have tried messing with the throttle, and didn’t seem to be the issue. I will pull the neutral safety switch and do some testing.
 
Need a helper, but when it's not cranking check power on the small Yellow/Red wire on slave solenoid. Might also be a bad connection
 
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