I already did a search before posting. I'me hoping I won't get flamed. I just bought an aftermarket horn (Bosch Eurpa) and am wondering if installing it is easy. I'me not good with electronics. Am I gonna need a relay? Any instyructions on how to do it?

 

lol i would its a plug and play type deal mang....

 

Some aftermarket horns require a relay and some don't, but adding one to be safe won't hurt. If the horn comes with a grounding point as well as a 12V(+) side, here's what you can do...

If you want to use the factory horn on the steering wheel to honk the aftermarket horn (I know some people like to put in a whole new button for aftermarket horns LOL), you will need to find the factory horn wire (probably found at the steering column or you can just go to the factory horn) and you'll need to test it for polarity. If it is a "negative" (meaning you read 12V when probing the wire and when you press the horn, the voltage drops to zero) then you will need to:

(1) Ground the appropriate side of the horn to the chasis
(2) Run a wire from 30 on the relay to the 12v (+) side of the aftermarket horn
(3) Put 12v(+) to 86 and 87 of the relay (fused with the recommended size fuse)
(4) Lastly, put the negative horn trigger wire to 85 on the relay

If your horn requires a negative (-) to honk it, let me know and I'll tell you how to wire the relay. These instructions are just assuming the horn has a negative and a positive side to it and requires either a negative or positive pulse to honk it..

Hope that helps

 

There is a red wire in conector c129 in the driver kick panel. This is a negative trigger from the horn button that triggers a relay for the factory horn.

Krish explained the realy right as well.

 

thank you guys for the info. ile check tomorrow.