Horn circuit - Horn changeover to Hella Supertone - Nissan Frontier Forum
 
LinkBack Thread Tools Display Modes
post #1 of 10 (permalink) Old 03-05-2012, 10:09 PM Thread Starter
Shift_Enthusiast
 
Sixspeed-SV's Avatar
 
Join Date: Oct 2011
Location: Vallejo, California
Posts: 424
Thanks: 662
Thanked 89 Times in 65 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
Feedback Score: 0 reviews
Exclamation Horn circuit - Horn changeover to Hella Supertone

Greetings,

I am having trouble to locate the circuit of the horn to make a change over to the Hella "supertone" horn. I have located the nice dry relay box in the engine room and thread the wire from the horn fitment. The horns have mounted nicely to the frame behind the grill on the top rail cross member.
question: Is the Horn on the steering column a negative lead?
this is mentioned as an option for connection as either positive or negative poles .. what do you know about the circuit? thank you.
Threading the wire into the cabin looks like a challenge - a lot of investigating. Disturbing the factory set up is asking for problems when the task has been dumb. Your thoughts on the matter?

thank you.
Sixspeed-SV is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old 03-07-2012, 10:22 AM
Shift_Enthusiast
 
Join Date: Feb 2011
Location: Rhode Island
Posts: 190
Thanks: 0
Thanked 30 Times in 22 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Why not just remove the connector from the factory horn(s), tap into the green wire, and connect your new horn between the green wire (+) and ground (-). That gives you the option to restore the original horn in the future by just plugging the connector back in.

The horn switch in the steering wheel is low side switched (to ground, what you called "negative lead"), and operates a relay that switches fused battery positive to the horn. So the horn itself is high-side switched.
inov8 is offline  
post #3 of 10 (permalink) Old 03-07-2012, 08:40 PM
Shift_Obsessed
 
Join Date: Sep 2006
Posts: 6,057
Thanks: 0
Thanked 830 Times in 582 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
bypass existing horn wiring and rewire into the cab? wow talk about needlessly creating more work than needed without any benefit.
and should you blow a fuse if the new horn draws too many amps, you can wire in a relay using the EXISTING stock horn wiring.
zoomzoom is offline  
post #4 of 10 (permalink) Old 03-08-2012, 11:41 PM Thread Starter
Shift_Enthusiast
 
Sixspeed-SV's Avatar
 
Join Date: Oct 2011
Location: Vallejo, California
Posts: 424
Thanks: 662
Thanked 89 Times in 65 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
Feedback Score: 0 reviews
Thank You!
The Hella horn requires more amps than the standard horn circuit. I will fry the original circuit. It seems like new lead wires routed to the relay box in the engine compartment... this is 2nd generation and the fuze box, relay, on-board CPU/block is on the right side. Heavy wire harness! There is little room to thread fresh lead wires into the steering column through the fire wall without a breach of the passenger cabin.

suggestions ideas?
Sixspeed-SV is offline  
post #5 of 10 (permalink) Old 03-09-2012, 10:36 AM
Shift_Enthusiast
 
Join Date: Feb 2011
Location: Rhode Island
Posts: 190
Thanks: 0
Thanked 30 Times in 22 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
According to the Hella web site, these horns draw 5.5A each, 11A for both. The factory horn circuit is fused at 15A. Nothing will "fry", but I like to see more like a 2:1 margin between fused and expected current.

I'm with Zoomzoom on this one . . . just trigger off the factory horn. There is no benefit to running extra wires into the steering column or relay module, and lots of opportunities for disaster.

Here is the circuit I would use if installing the horns in my truck. You can leave the factory horn(s) connected for "mega-loud", or pull off the connector . . . . your choice.
The inline fuse and Bosch automotive relay are available from Radio Shack, Amazon, Parts Express, WalMart, etc., for less than $5. A relay may have even come with the horns.

inov8 is offline  
The Following 4 Users Say Thank You to inov8 For This Useful Post:
Ahgalaga (06-26-2012), crewmaxxis (03-09-2012), dubie2003 (03-09-2012), Sixspeed-SV (03-11-2012)
post #6 of 10 (permalink) Old 03-09-2012, 01:45 PM
Shift_Obsessed
 
Join Date: Sep 2006
Posts: 6,057
Thanks: 0
Thanked 830 Times in 582 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Quote:
Originally Posted by inov8 View Post
According to the Hella web site, these horns draw 5.5A each, 11A for both. The factory horn circuit is fused at 15A. Nothing will "fry", but I like to see more like a 2:1 margin between fused and expected current.

I'm with Zoomzoom on this one . . . just trigger off the factory horn. There is no benefit to running extra wires into the steering column or relay module, and lots of opportunities for disaster.

Here is the circuit I would use if installing the horns in my truck. You can leave the factory horn(s) connected for "mega-loud", or pull off the connector . . . . your choice.
The inline fuse and Bosch automotive relay are available from Radio Shack, Amazon, Parts Express, WalMart, etc., for less than $5. A relay may have even come with the horns.

^^ exactly.

please trash this idea of wanting/needing to run a new wire through the firewall into the cabin then into the steering column or wherever else you're thinking. it's useless and unnecessary. inov8 has presented you with a simple diagram that is most effective for what you are trying to do.
zoomzoom is offline  
The Following 2 Users Say Thank You to zoomzoom For This Useful Post:
dubie2003 (03-09-2012), Sixspeed-SV (03-11-2012)
post #7 of 10 (permalink) Old 03-11-2012, 10:48 PM Thread Starter
Shift_Enthusiast
 
Sixspeed-SV's Avatar
 
Join Date: Oct 2011
Location: Vallejo, California
Posts: 424
Thanks: 662
Thanked 89 Times in 65 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
Feedback Score: 0 reviews
Hella Horn

Fantastic information. A 30amp relay was included with the Hella box. thank you all for the input.
Sixspeed-SV is offline  
post #8 of 10 (permalink) Old 06-26-2012, 09:51 PM
Shift_Newbie
Lifetime Member
 
Join Date: Sep 2011
Posts: 61
Thanks: 3
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
[quote[/quote]

Hi, I wanna do this install tomorrow. I had an air horn installed before so my factory connector was cut off. I understand running the green wire to #85 in the relay but what to i do with the black wire?

thanks
Ahgalaga is offline  
post #9 of 10 (permalink) Old 06-26-2012, 11:02 PM
Shift_Enthusiast
 
Join Date: Feb 2011
Location: Rhode Island
Posts: 190
Thanks: 0
Thanked 30 Times in 22 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
The black wire is connected to chassis ground through the factory wiring, so you have 2 options:
(1) As shown in the drawing, connect both relay terminal 86 and the negative horn terminals to chassis, and don't make any connection to the black wire at all.
(2) Connect relay terminal 86 and the horn negative terminals to the black wire instead of chassis ground. With this option, neither connection to chassis are required because the black wire supplies the ground connection.
inov8 is offline  
post #10 of 10 (permalink) Old 06-26-2012, 11:09 PM
Shift_Newbie
Lifetime Member
 
Join Date: Sep 2011
Posts: 61
Thanks: 3
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Perfect, thanks for your help and info
Ahgalaga is offline  
Reply

  Nissan Frontier Forum > Mods and Technical Discussions > Audio / Video

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Nissan Frontier Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On