Horn Relay Retrofit for First-Gen 4Runners - YotaTech Forums

Go Back  YotaTech Forums > Toyota SUV & Truck Tech > 86-95 Trucks & 4Runners
Reload this Page >

Horn Relay Retrofit for First-Gen 4Runners

Notices
86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

Horn Relay Retrofit for First-Gen 4Runners

Reply

Old 06-25-2018, 02:59 PM
  #1  
Registered User
Thread Starter
 
RAD4Runner's Avatar
 
Join Date: Mar 2012
Posts: 5,544
Thanked 28 Times in 26 Posts
Horn Relay Retrofit for First-Gen 4Runners

Why this mod?
Because my horn sounds like Mickey Mouse with his balls caught in a mouse trap - LOL!
Why?
Because the current for the first gen pickup and first gen 4Runner runs from battery, to horn, TO CABIN, TO HORN BUTTON ON STEERING WHEEL, back to engine compartment, to ground point on inner fender; No different from the convoluted path of headlight and starter relay current. This causes lots of voltage drops along the wiring and horn button, and subjects horn button to full load current; worse if one upgrades to higher power horn.

This mod will fix that, and allow us to put higher power horn(s) if we want.* I think this Horn Relay Retrofit will apply to all First-Gen and earlier which do not have horn relay. (I don't know about the 1989 pickup.)
Yes, I will still inspect/fix the sliding pin/contact in the steering column.




Second gen 4Runner has horn relay to carry horn load current:


HERE'S HOW I WIRED MINE (Schematic explains most details):


OVERVIEW AND GENERAL WORK AREA IS UNDER RIGHT -SIDE FENDER, FRONT CORNER (BELOW):


SNIP WIRES "A" AND "B" AT POINT WHERE IT WOULD BE EASY TO SPLICE / SOLDER.


SPLICE EXTENSION WIRES TO REACH RELAY IN ENGINE COMPARTMENT:
I put mine forward of the fuel injector resistor bank. Two feet of wire per extension worked well for me.



I LINED TOP SURFACE OF WHEEL-WELL WITH THIN RUBBER SHEET TO PROTECT WIRES.


I ALSO WRAPPED WIRE BUNDLE THROUGH THE GROMMET WITH SAME RUBBER SHEET FOR EXTRA PROTECTION.


I did not bother buying wires with stock colors so i just labeled new wires

ALSO ON T4R HERE.

Last edited by RAD4Runner; 12-07-2018 at 10:31 PM.
RAD4Runner is offline  
Reply With Quote
The Following 2 Users Say Thank You to RAD4Runner For This Useful Post:
ev13wt (12-05-2018), old87yota (12-04-2018)
Old 06-25-2018, 03:47 PM
  #2  
Registered User
 
Join Date: Aug 2013
Location: Southern Arizona
Posts: 2,774
Thanked 18 Times in 18 Posts
I like the piss-ant sound of my '87s horn. My family calls it the 'meeper'. Living in a largely rural area; I don't use it much.
millball is offline  
Reply With Quote
Old 06-25-2018, 03:49 PM
  #3  
Registered User
Thread Starter
 
RAD4Runner's Avatar
 
Join Date: Mar 2012
Posts: 5,544
Thanked 28 Times in 26 Posts
Originally Posted by millball View Post
Living in a largely rural area; I don't use it much.

Need it in So Cal. Less wear than using the brakes - LOL!
RAD4Runner is offline  
Reply With Quote
Old 06-25-2018, 04:02 PM
  #4  
Registered User
 
Join Date: May 2011
Location: Northern AZ
Posts: 1,053
Thanked 11 Times in 11 Posts
So is this just the plan or have you done it yet?
L5wolvesf is offline  
Reply With Quote
Old 06-25-2018, 04:13 PM
  #5  
Registered User
Thread Starter
 
RAD4Runner's Avatar
 
Join Date: Mar 2012
Posts: 5,544
Thanked 28 Times in 26 Posts
Originally Posted by L5wolvesf View Post
So is this just the plan or have you done it yet?
Plan, but that's how wiring's gonna be.
Need to dig and see how to re-route wires from stock horn to fuse block. May have to expose area above wheel-well.
RAD4Runner is offline  
Reply With Quote
Old 06-25-2018, 04:58 PM
  #6  
Fossilized
Staff
iTrader: (6)
 
dropzone's Avatar
 
Join Date: Oct 2005
Location: PNW
Posts: 18,996
Thanked 18 Times in 16 Posts
Even my 94 had a horn that sound like mouse balls..
went for an air horn.
dropzone is offline  
Reply With Quote
Old 06-26-2018, 06:47 AM
  #7  
Registered User
iTrader: (2)
 
se7enine's Avatar
 
Join Date: Nov 2006
Location: Reno , Nevada
Posts: 461
Thanks: 0
Thanked 2 Times in 2 Posts
I replaced my horn with some Denso horns from a Camry. My horn is pretty loud now. I also added a relay.
se7enine is offline  
Reply With Quote
Old 06-26-2018, 07:24 PM
  #8  
Registered User
Thread Starter
 
RAD4Runner's Avatar
 
Join Date: Mar 2012
Posts: 5,544
Thanked 28 Times in 26 Posts
Originally Posted by dropzone View Post
Even my 94 had a horn that sound like mouse balls..
went for an air horn.
Originally Posted by se7enine View Post
I replaced my horn with some Denso horns from a Camry. My horn is pretty loud now. I also added a relay.
Nice! Adding more horns would definitely require a relay.
Ideally, may also be required on air horn, depending on how much current the solenoid valve draws.
RAD4Runner is offline  
Reply With Quote
Old 06-27-2018, 06:40 PM
  #9  
Registered User
 
Join Date: May 2011
Location: Northern AZ
Posts: 1,053
Thanked 11 Times in 11 Posts
Originally Posted by RAD4Runner View Post
Nice! Adding more horns would definitely require a relay.
Around the time you posted about this project I came across a nice nearly new looking pair of Lexus horns and scored them for nearly nothing. My question is . . . along with more horns requiring a relay would an increase in the size of the wiring to the horns be required?

Oh, and you guys know wayyy too much about mouse balls.

Last edited by L5wolvesf; 06-27-2018 at 06:41 PM.
L5wolvesf is offline  
Reply With Quote
Old 06-27-2018, 08:02 PM
  #10  
Registered User
Thread Starter
 
RAD4Runner's Avatar
 
Join Date: Mar 2012
Posts: 5,544
Thanked 28 Times in 26 Posts
Originally Posted by L5wolvesf View Post
Around the time you posted about this project I came across a nice nearly new looking pair of Lexus horns and scored them for nearly nothing. My question is . . . along with more horns requiring a relay would an increase in the size of the wiring to the horns be required?

Oh, and you guys know wayyy too much about mouse balls.
Same wire size as the ones going to stock horn or one size shud be good. The key is shortening the path and relieving the steering column contacts of the load current.
re balls,.LOL!
RAD4Runner is offline  
Reply With Quote
Old 12-04-2018, 08:48 PM
  #11  
Registered User
Thread Starter
 
RAD4Runner's Avatar
 
Join Date: Mar 2012
Posts: 5,544
Thanked 28 Times in 26 Posts
HORN RELAY RETROFIT COMPLETE! I UPDATED ORIGINAL POST ABOVE.
RAD4Runner is offline  
Reply With Quote
The Following User Says Thank You to RAD4Runner For This Useful Post:
Neemox (12-06-2018)
Old 12-06-2018, 09:44 AM
  #12  
Registered User
 
Join Date: Mar 2017
Posts: 19
Thanked 0 Times in 0 Posts
Hey RAD, this may be a silly question, but what relay did you use? Does it matter much what relay I get? Definitely plannign on fixing/upgrading my horn and your post is the impetus I needed. Thanks!
Neemox is offline  
Reply With Quote
Old 12-06-2018, 10:22 AM
  #13  
Registered User
Thread Starter
 
RAD4Runner's Avatar
 
Join Date: Mar 2012
Posts: 5,544
Thanked 28 Times in 26 Posts
Originally Posted by Neemox View Post
Hey RAD, this may be a silly question, but what relay did you use?!
Most welcome. Standard 30-amp automotive Bosch-type relay is good and easily-available from parts store.

Last edited by RAD4Runner; 12-06-2018 at 10:29 AM.
RAD4Runner is offline  
Reply With Quote
Old 12-06-2018, 02:26 PM
  #14  
Registered User
 
Join Date: Sep 2007
Location: San Francisco East Bay
Posts: 6,293
Thanks: 0
Thanked 32 Times in 30 Posts
You might want to get a socket for the relay https://www.aliexpress.com/item/1Pcs...795113903.html (though most relay tabs are 1/4", so you can connect to it with a 1/4" female push crimp).

RAD4runner's drawing shows an SPDT (single-pole, double-throw) relay, but he only uses it as an SPST. So that's all you need.
scope103 is offline  
Reply With Quote
Old 12-06-2018, 06:05 PM
  #15  
Registered User
Thread Starter
 
RAD4Runner's Avatar
 
Join Date: Mar 2012
Posts: 5,544
Thanked 28 Times in 26 Posts
Originally Posted by scope103 View Post
You might want to get a socket for the relay https://www.aliexpress.com/item/1Pcs...795113903.html (though most relay tabs are 1/4", so you can connect to it with a 1/4" female push crimp).

RAD4runner's drawing shows an SPDT (single-pole, double-throw) relay, but he only uses it as an SPST. So that's all you need.
+1^^^
Tnx for clarifying that detail, Scope.
All,
I updated schematic accordingly.
RAD4Runner is offline  
Reply With Quote
Old 12-07-2018, 05:08 AM
  #16  
Registered User
 
wallytoo's Avatar
 
Join Date: May 2013
Location: nh
Posts: 768
Thanks: 0
Thanked 13 Times in 13 Posts
it might be just me, but i only see a "-" for the photo showing overview and general work area.
wallytoo is offline  
Reply With Quote
Old 12-07-2018, 05:31 AM
  #17  
Registered User
Thread Starter
 
RAD4Runner's Avatar
 
Join Date: Mar 2012
Posts: 5,544
Thanked 28 Times in 26 Posts
Originally Posted by wallytoo View Post
it might be just me, but i only see a "-" for the photo showing overview and general work area.
Electrons got lost. Direct Link to Picture is here. Will fix whn I get to laptop:
https://lh3.googleusercontent.com/Ni...=w1354-h669-no

Last edited by RAD4Runner; 12-07-2018 at 10:32 PM.
RAD4Runner is offline  
Reply With Quote
Old 12-07-2018, 09:35 AM
  #18  
Registered User
 
87-4runner's Avatar
 
Join Date: Mar 2012
Location: Oklahoma
Posts: 158
Thanks: 0
Thanked 5 Times in 5 Posts
First it's always a game trying to find that exact spot on the horn cover that finally honks the mickey mouse, balls in trap horn... by then it's too late and I've forgotten what i was trying to honk at... but, I feel like I won something just getting it to honk.

secondly... the horn is so cute, it's like whatever or whoever I'm honking at isn't scared, alarmed, intimidated in any way... they just look like " oh, isn't that cute," so I'll probably leave mine the way it is for posterity... it works for me.
87-4runner is offline  
Reply With Quote
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Bryan4x4
86-95 Trucks & 4Runners
20
02-10-2017 10:31 AM
ingenuitor
86-95 Trucks & 4Runners
4
04-22-2013 08:18 PM
adamthedroog
86-95 Trucks & 4Runners
9
07-17-2012 11:29 AM
skidder
86-95 Trucks & 4Runners
0
09-30-2010 12:13 AM
89macrunner
95.5-2004 Tacomas & 96-2002 4Runners
5
07-22-2005 03:22 PM


Thread Tools
Search this Thread
Quick Reply: Horn Relay Retrofit for First-Gen 4Runners


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: