Need help with Ford Upfitter switches - Train Horn Forums

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Old 16th August 2012
bradinwva bradinwva is offline
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Default Need help with Ford Upfitter switches

Hey everybody-Heres what I m wanting to do. My f250 has the upfitter switches that are powered and I want to wire my electric air valve up to a switch so when the power is on, the big horns will blow and when its off my regular old truck horn is all that will blow. Does anybody know how I could wire this up? I figured I'd need a relay so I bought a 4 prong and a 5 prong just to be safe.
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Old 17th August 2012
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Default Re: Need help with Ford Upfitter switches

I don't know much about the upfitter switches. They have been talked about a little bit.

Do they make a SPDT or DPDT switch? If so you can just use it to route power to either horn.

If they only have SPST (plain ol on/ff), you can use the 5 pin relay.
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Old 17th August 2012
bradinwva bradinwva is offline
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Default Re: Need help with Ford Upfitter switches

the switches are fused and just plain old up is on down is off. I thought I could use a relay and wire it up because if I didnt when the switch was on when I hit the horn button on the steering wheel I would get 12v from the factory horn and 12v more from the upfitter switch too.
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Old 17th August 2012
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Default Re: Need help with Ford Upfitter switches

yeah, just use the 12v from the upfitter switch to energize a relay.
A 5 pin relay would do the switching between horns.

12v from upfitter switch to pin 86
ground pin 85
wire from steering wheel to pin 30
pin 87 is (usually) normally open - wire to new horn
pin 87a is (usually) normally closed - wire to stock horn

This should allow you to "arm" your trainhorn with your upfitter switch.
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Old 17th August 2012
bradinwva bradinwva is offline
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Default Re: Need help with Ford Upfitter switches

I sure appreciate it. thats a big help.
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Old 25th August 2012
bradinwva bradinwva is offline
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Default Re: Need help with Ford Upfitter switches

If I were to use a 4 pin relay how would i need to wire it? I know I have 1 for ground 1 for power, I was going to just run a wire out to the horn outside to get the trigger for the electric valve. How am I doing so far?
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Old 26th August 2012
Mts678 Mts678 is offline
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Default Re: Need help with Ford Upfitter switches

I just finished my Nathan kit on my 08 f250. I used aux 1 for the horn on and off and aux 2 to turn the compressor on and off. Very simple and works well.
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2008 F250 PSD- Twin Turbo Diesel CCLB FX4
Deleted | H&S mini max | Leveled | Tinted | 20" wheels wrapped in Nitto Dunes | Marching band in cab(Focal speakers) 12" Kicker | CTS Insight 4 Monitoring | Python | 5" DPBE FloPro w/6" tip | Smoked 3rd brake light, side mirror lenses & tail lights by me | Tuxedo Bed Cover | HID Retrofitted FX-R's Headlights | Nathan P3 train horns & Onboard Air...they're not train horns if they're plastic :nod: |
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Old 26th August 2012
bradinwva bradinwva is offline
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Default Re: Need help with Ford Upfitter switches

thats the same thing I was going to do. Did you use a relay between the upfitter and the electric horn valve and the stock horn trigger wire?
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Old 26th August 2012
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Default Re: Need help with Ford Upfitter switches

Originally with the 5-pin relay we were talking about switching between the stock horn and trainhorn.

So now you just want to use the upfitter switch to honk the trainhorn??
If so, no relay required.

Or are you still trying to use the steering wheel?
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Old 26th August 2012
Mts678 Mts678 is offline
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Default Re: Need help with Ford Upfitter switches

No relay, the upfitters are fused. The first two (aux 1 & aux 2) are 30 amp, 3 & 4 are 10 amp. No reason for a relay.
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2008 F250 PSD- Twin Turbo Diesel CCLB FX4
Deleted | H&S mini max | Leveled | Tinted | 20" wheels wrapped in Nitto Dunes | Marching band in cab(Focal speakers) 12" Kicker | CTS Insight 4 Monitoring | Python | 5" DPBE FloPro w/6" tip | Smoked 3rd brake light, side mirror lenses & tail lights by me | Tuxedo Bed Cover | HID Retrofitted FX-R's Headlights | Nathan P3 train horns & Onboard Air...they're not train horns if they're plastic :nod: |
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