Topic

Hi anyone out there put air horns on MGF instead of OE horn.wiring as the diagram 4 pin relay pin 30= constant live pin 87=to + of compressor pin 85 to - using - off horn connection and pin 86 to + of horn and a - from compressor to ground connection nothing........re connect old horns they still work

Not tried air horns but that relay wiring should work.

Are you sure of your earths? Is the relay working properly?

Hi mate yeah that's the weird bit wiring it that way as soon as I connect the neg onto the terminal 85 its clicking like its live even without the ignition on

The earth from the relay should go to earth, not to the original horns "return" as this is switched in the BCU.