air horn install question

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underthegun

Member - Posts: 2

Joined: March 28, 2003

Location: United States

Posted: March 28, 2003 at 6:06 PM / IP Logged

Whats goin on everyone.

Today I tried to install a Wolo air horn in my 2002 grand am gt...everything went OK but when i put the inline fuse in after I was done, the horn goes off...I wired pin 85 on the relay to the positive side of my existing stock horn wire, right above the connector next to the horn, I think this might be the culprit buy I am not sure...

the wiring is as follows.

negative lead on compressor is grounded to chassis

positive lead on compressor goes to pin 87 on relay

12 v constant goes from under hood fuse box, with inline fuse, to pin 30 on relay

pin 30 on relay is then jumped over to pin 86 on relay

pin 85 is connected the the positive lead coming off of the connector on the stock horn

now when i insert the inline fuse, the horn goes off...what am i doing wrong? I want this horn to sound when I hit the OEM horn button on my steering wheel.

any help on this would be greatly appreciated.

Thank you

themagicone

Silver - Posts: 325

Joined: October 01, 2002

Location: United States

Posted: March 28, 2003 at 6:59 PM / IP Logged

Your want to find the wire that goes to ground when you press your factory horn or switch 86 to ground.

underthegun

Member - Posts: 2

Joined: March 28, 2003

Location: United States

Posted: March 28, 2003 at 7:22 PM / IP Logged

themagicone wrote:

Your want to find the wire that goes to ground when you press your factory horn or switch 86 to ground.

thank you for the reply, but could you explain a little more? Do you mean to change the jumped pins(86 and 30) to ground? And should I ground it to the stock horns ground or the chassis? Thanks

themagicone

Silver - Posts: 325

Joined: October 01, 2002

Location: United States

Posted: March 28, 2003 at 7:52 PM / IP Logged

HORN TRIGGER|black |- |steering column

87 - To 12vlt input of air horn

85 12vlts 87a N/C 86 Black horn input

30 12vlts constance

auex

Platinum - Posts: 5,041

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Joined: December 23, 2002

Location: Arizona, United States

Posted: March 29, 2003 at 8:36 AM / IP Logged

Okay, it sounds like you are doing this under the hood. For the basics you need to wire the ground of the air compressor to the chassis, the power for the compressor to 87 of the relay, 30 will be +12V, and as for 85 this will go to the trigger for the horn,86 will be the opposite of the trigger( if the trigger is negative or ground then 86 needs to be +12V, if the trigger is +12V then 86 needs to be ground). If you are doing the wiring under the dash then see themagicone's diagram.

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air horn install question

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