You need a meter, this is fundamental as we can all sit here guessing but you don't know what power is present.

I guess he has a point with the steering, however although it works it may not be the correct tension and so it will slip.

If it extinguishes as the revs rise it would suggest the power is not there at slower speeds, which may indicate a alternator or regulator problem.

It's not a wire broken if someone mentions that, that would cause an unrelated problem.

Martin