Ford Power Stroke Nation banner

1 - 20 of 21 Posts

·
THOMPSON13
Joined
·
424 Posts
Discussion Starter #1
Yesterday I got everything for my airhorns bolted on to the truck. Today I do the wiring and I'm stuck. Sorry bout the quick pictures. lol

First is the relay
5 pin
Red, White, Black, Yellow and Blue

This is my thoughts please tell me if I'm on the right track. Can I wire it like:

Red: Power in from battery
Black: Ground
White: Switch
Yellow: Power to compressor
Blue: ?




I'm also wanting to switch the horns between stock (damn safety check stops) stock with airhorns. I'm confusing myself because I'm trying to figure everything out at once instead of one thing at a time. Will this work since the horn is an open circuit? Red wire from the air release valve up to the switch, and leave the black taped off? see, I'm confusing myself. UGH

 

·
THOMPSON13
Joined
·
424 Posts
Discussion Starter #2
also... should I put an inline fuse between the battery and the relay? My aftermarket fog lights are like that so idk.
 

·
Registered
Joined
·
41 Posts
Did the 5 pin relay come with the kit?

Normally in a 5 pin relay, its set up as follows:

85 - ground
86 - + from switch
30 - to whatever it is thats being turned on (in your case the tank/compressor)
87a - source a, 12v in
87 - source b, 12v in

The idea is that when the switch is in the off position, the circuit draws power off source a, but when the switch is flipped on, it energizes the relay, and allows the power to come from source b instead of a. For example, i have a flasher hooked up to my mirror lights, so they strobe. When i have the flasher unit off, they act as normal running lights. When i flip the flasher on, the relay energizes and switches the input source to the bulb from the normal running light power a over to the input from the flasher b.

Here: http://www.autoshop101.com/forms/hweb2.pdf

That being said, I believe if you leave the 87a pin empty, in the off position, it wont recieve any power.

Ground to 85, 12v from switch to 86, 30 to compressor, and 87 from battery.

Also, on your switch, by black, do you mean ground? Unless the switch has a light in it (which would mean it has 3 pins), it doesnt need ground. Red power goes in one pin, and out the other.

I have never wired a horn set up tho, so i dont know if yours has directions or not. That above is just what i know of general eletrical stuff.

If im wrong, someone say so and ill delete this lol
 

·
THOMPSON13
Joined
·
424 Posts
Discussion Starter #4
No I didnt buy a kit. I pieced the system together. The relay came from a guy that had the compressor on a bagged truck. Its a generic plug so I dont see any of those numbers. I did an online search for awhile last night so I know what your talking about tho.

I dont know if color matters on relays much but the way this plug is set up is.

Red @ 87a
Black @85
White @ 86
Yellow @ 87
Blue @ 30


If what your saying is correct then I need to stop thinking that red is power in. I think thats what is confusing me. Also by the looks of it, white and black are 14g and the rest are thicker, 12g maybe. If that helps any.

and yes I meant black as ground. The switch I have now is a 2 pin. What your saying is I need to run a 12v switched to the bottom, then 86 (white) from the top?
 

·
THOMPSON13
Joined
·
424 Posts
Discussion Starter #6
ok looks like this will work.
Now I need to figure out how to switch the horns. The whole open circuit thing is throwing me off but I think I'm on to something. Pressing the horn completes the loop? That cant be right. Its an open loop so pushing the horn grounds it out. right? If thats the case do I not run a ground on the valve that releases the air to the horns? ugh!
 

·
THOMPSON13
Joined
·
424 Posts
Discussion Starter #8
I switched the yellow and the blue around and now it is intermittent like a flasher. I know I'm close
 

·
Military Member
Joined
·
309 Posts
Here is how the 1st relay should be wired....

86 - 12V Constant
85 - One prong on pressure switch on the tank (other prong of pressure switch to chassis Ground)
30 - 12v Switched
87 - To compressor 12v input (compressor negative to chassis Ground)

The horn wire should be wired like your second drawing with the switch. except the red from the release switch should go to 12v constant and the ground should go to the switch.
 

·
THOMPSON13
Joined
·
424 Posts
Discussion Starter #10
k... who wants to call me a D.A. first? After looking at the relay I noticed that it was a "flasher" relay. I took it back and got a "regular" one. Now all thats left to figure is the horn part. I'll try your advise Tony, thanks
 

·
THOMPSON13
Joined
·
424 Posts
Discussion Starter #11
this is where I am stuck. This is what I have now and doesnt work. It makes the stock horn go off when switch is "on" I know its because of that ground but if I disconnect the ground on the release valve on the air line, then that wont work. Anyone?

btw THANK you for putting up with this thread!

 

·
THOMPSON13
Joined
·
424 Posts
Discussion Starter #12
Your sayin to do it like this? will the ground from the indicator light matter or do I need to get rid of it?

 

·
THOMPSON13
Joined
·
424 Posts
Discussion Starter #13
Neither one of those work. I'm spliced into the steering wheel under the dash. I have both Power and Ground wires from the air valve switch ran to the dash. Do I need a switch with 3 prongs on the back of it? One prong to run power in, one prong to flip to the stock horns and one prong to flip to the air valve? This is frustrating!
 

·
Registered
Joined
·
2,411 Posts
I've been wiring these a LONG time.

This will allow the compressor to run at all times when the main power is on (through the pressure switch that is wired in series with the compressor). The pressure switch will be an NC (normally closed) switch that will open at a set pressure.

When the control switch is closed, the relay will then activate the solenoid valve that allows air to be sent to the air horn itself. Once the switch is opened, power will be once again sent to the cut-off and compressor.

The plus-side of doing it like this is that you only need one control wire from the switch (the factory horn button is a ground........).
 

·
THOMPSON13
Joined
·
424 Posts
Discussion Starter #16
Thanks Cody.... I have that part figured out. What I cant get now is the toggle to switch from only the stock horn to switch over to run the stock and air horns. The whole stock (open Circuit) and the release valve to the air line ("not" open) is confusing me. It seems like no matter how I wire it up it makes the stock horn go off with out pushing the horn button on the steering wheel. (The ground from the release valve is completing the circuit)
What I have is the red and black from the release valve, ran to the dash. Then I spliced into the stock horn wire. So I have 3 wires. How do I wire them to do a toggle between the horns?
 

·
THOMPSON13
Joined
·
424 Posts
Discussion Starter #17
(the factory horn button is a ground........).
I think this is where I'm confused then. I need to splice the ground from the horn to the ground of the release valve on one side of the switch. Then the power of the release valve I need to wire on the other end of the switch with a 12v switched. ??
 

·
THOMPSON13
Joined
·
424 Posts
Discussion Starter #18
This is how I would do it.


Does 86 power 87a and 30 power 87? Just curious because I have mine like this. I HAD 87 and 87A ran straight to the compressor but once I found out that the release solenoid needed to be on a 12v switched, I put it this way.
Now I'm stuck on the toggle between the stock and air horns.

 

·
Registered
Joined
·
2,411 Posts
Does 86 power 87a and 30 power 87? Just curious because I have mine like this. I HAD 87 and 87A ran straight to the compressor but once I found out that the release solenoid needed to be on a 12v switched, I put it this way.
Now I'm stuck on the toggle between the stock and air horns.
No.

85 and 86 are the control circuit. They are not physically hooked to 30, 87, or 87A in any way, shape, or form.

30 is the supply to the relay on the high-current side. 87 and 87A can NEVER conduct current between themselves.

30 will have continuity to 87A when the control circuit is not energized and 30 will have continuity with 87 when the control circuit is engaged.

I'll come up with another schematic in a few minutes.
 
1 - 20 of 21 Posts
Top