Ground wire

[s14sliding]

Dumb question I know but I want to be sure before starting the car and something going wrong. Im assuming this is a ground wire correct? Thanks for any help guys.

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[Mikester]

Put a meter on it and check voltage/continuity between it and different points across the motor & chassis... If continuity, then yes it's a ground. If it reads voltage or has no continuity to chassis, it's probably power.

Easy peasy.

[s14sliding]

I know it's not the power wire and can't check voltage since I have no battery installed just yet. That's why why I'm wondering if this is a ground or not.
http://img.tapatalk.com/d/14/01/03/eheqedu7.jpg

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[Mikester]

Then see if it has continuity to chassis. If so, it's a ground.

If it's a Wiring Specialties harness, there are diagrams that show what's what... To me, it looks like either the connection for the starter or the alternator post.

[X_JON_X]

That looks like the positive feed to the starter motor.

http://i976.photobucket.com/albums/ae243/X_240JJ_X/Untitled_zps13199154.png (http://s976.photobucket.com/user/X_240JJ_X/media/Untitled_zps13199154.png.html)