Where to hook into air line to install air horn?

[blairsvilleoffroad]

Installing air horn in my 1078, where do I hook into the high pressure air system, also 12 volts for air switch? thanks

 

[spankybear]

I am thinking of installing this... https://www.eriksmilitarysurplus.com/airhodhowi24.html

Can't say where to tap into the air system though...

 

[simp5782]

Air tanks have an extra port you can add a fitting into. You can mount it on the frame rail behind the air tanks. Or you can tap off a supply line off the tank. You would want to add a pressure protection valve before the air gets to the horn in case of a air loss issue the horn wont steal air when the brakes need it

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[Andyrv6av8r]

I tapped mine into the fan supply line; it's already after the PPV and is right at the front of the truck.

 

[ARYankee]

I tapped mine into the fan supply line; it's already after the PPV and is right at the front of the truck.

I know this is a bit old but where is that line? Is it the fitting marked with an arrow in the attached picture?

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[m-35tom]

Don't bother with that, but the $15 dollar air horn on ebay. It is really loud and is 12 volt.

 

[ARYankee]

I got it installed and it works perfectly!

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[TomTime]