Electrical/ground gremlin? 07 5spd 1.5l

[PowerSet]

Hey everyone, I’m a new member, but Ive browsed through the forums many times to get info in the past, but I cannot find much info about the grounds on this engine, and what I do find leads to dead links and dead images.


The problem,
The car will currently start (90% of the time) runs and drives perfectly fine 90%,

If you turn on the lights, the stereo may cut out, the dash lights may dim, turn on interior lights and the tach/speedo lights dim significantly.

If you are stopped, taking a sharp turn, the power steering will cut completely out, as well as the stereo, interior lights etc.
When this happens, the engine is still running perfectly smooth and does not hesitate or stall.

I checked over the connections, everything seems tight, I added a ground strap from the engine to the chassis just for kicks.

Recently I changed the starter, it was fairly easy so I don’t imagine that was it, but the problem is new.

Just before that, the clutch was replaced by a friend of mine, he’s been a mechanic for decades, so the engine was recently semi-dismantled and a lot could have been forgotten.

This problem did first occur during heavy rain shortly after my sister apparently took off her plastic splash gaurd under the engine because it was very broken, I doubt it’s related, but I don’t know how sensitive these cars are, and I figure I might as well give as much info as I can.


I saw something about a braided cable ground from the engine, but the pictures were dead and I did not notice anything when poking around in the engine bay.

Any help or suggestions would be greatly appreciated, it’s an 07 5 speed 4 door sedan with a 1.5l engine my sister bought new, and has not maintained too well.