cant find why my horn barely works

How's the connection behind the horn button? I've seen them loose before and intermittently works when you turn the steering wheel.

 

Remove the wire from the horn button and manually touch the metal end terminal of the wire to the bare metal on the inside of the steering wheel hub:

If that works well = you have a bad horn button or the connection between the metal contact on the horn button and the inside of the steering wheel hub is bad.

If you still have the same trouble = more likely something wrong with the brush/slip-ring assembly (e.g., a loose or broken rivet connection) or in the grounding of the steering column itself. If you get this result, use a jumper wire to connect the horn wire to another known good ground and see if that works or not.
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Anything metal.

 

Mine didn't work at first, weak, barely discernible, until I squirted some 3 in 1 oil into the motor then good to go. Not electronics, check this first.

 

I had a similar problem on my 355. I found that the horn relay contacts had about 1~2 ohms of resistance. May not sound like much but very significant. Installed a new relay and back in business...

 

I had this problem where the metal tip that contacts the slip ring was worn. I had to pull the slip ring assembly and add some metal to the tip . It works great for the last 8 years. I think I found in the search section on how someone once fixed this same problem.

 

I just fixed the same problem (for the 2nd time). See http://www.parrotbyte.com/kbc/ferrari/308/Horn.htm for details.