I just took off a grant gt steering wheel off my car(too small for manual steering) and put on a stock leather piece. Got some problems.
1. the horn doesnt work.
2. When the key is in the on position, the car starts to buzz really loud. A constant maaaaaaaaaaaaaaaaaaaaaaaaaaa. The hatch was open when doing this. Just added some grounds. Never done it before.

 

- yeah then you didn't hook it up.
As covered in the FAQ for FC sticky thread at the top of this section The loud buzzer comes on for three reasons, low oil, low coolant, or over rev (redline)

 

Thanks Icemark, I just remembered that I drained the coolant to take off the intake manifold. The horn works now.

 

Wow.