I have a 92 e36 the model without airbags.
I got tired of the massive and very worn steering wheel, so i sourced a boss kit that would fit my MOMO i have lying around.
I had a few minor challenges installing it due to the cheapness of the boss kit. but anyway,
the problem is that when i went to hook the horn up from my point of view its really really easy.
I've done it in other cars. theres simply a wire that goes to GND thus sounding the horn.
and on the MOMO horn, there are 2 tabs. one has an earth symbol that plugs onto a green loop wire which hooks on the little grounding plate and the other tab connects to a wire coming out of the steering column.
Being that it grounds my guess is that the + side of the circuit is complete and its the horn that acts as a N/O switch to connect the ground and complete the circuit.
My question is this.
Why when i turned the car on, and tested the horn did it sound for a split second and then stop working all together?
this puzzles me.
Help would be much appreciated