1989 Evinrude 150XP starter not engaging flywheel.

[Brutal_Boost]

I just replaced the starter and solenoid and the starter spins (it wouldn't even spin before) but won't engage the flywheel. I feel like it is a wiring issue as I have 3 wires not plugged into anything and I am not sure where they go. I am almost certain 2 of them are ground wires. What do you guys think? Is it a wiring issue or is there something more? I was going to replace the solenoid also because it was only $10 for a new one and I figured why not while I am in there but the new one broke because I tightened it too much. Here is a link to imgur with pictures. https://imgur.com/gallery/tQKLhEe

 

[racerone]

Have the battery load tested.

 

[boobie]

Battery in backwards ????

 

[rothfm]

Large Black looks to be the Battere Neg...If so, put to block on the mounting stud, along with the small black. The red goes to top of Sel with other Reds.