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M1009 Horn Replacement

MarcusOReallyus

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Well, there are two ways to go about it. Either approach requires that you run a heavy wire from a good power source (12v buss bar or battery terminal) to a relay.

The factory recommended method uses only one relay and your existing horn switch to trigger the relay. This is probably the best way to do it, but depending on the location of the existing horn relay, it might be a little more hassle. Here are the factory instructions:

http://www.wolo-mfg.com/419 english.pdf

The hassle part comes in when you try to find the wire that provides ground to your existing horn relay, and run it to wherever you are going to locate your new relay. Off the top of my head, I don't know where the stock relay is located. If it's under the hood, this is pretty easy. If it's under the dash, it becomes a hassle.

Another way is to use the existing 12v supply to the existing horn to trigger the relay. Like this:

View attachment 428000


Mount the new relay close to the existing horn, and use the existing 12v supply for the old horn to trigger the relay. Mount your new horn close by.

The advantages to this approach are twofold:



  1. This keeps all the wiring under the hood - no need to poke around under the dash.
  2. This keeps the original wiring fully intact. Nothing is cut, spliced, ruined, mangled, spindled, folded, or mutilated. Makes it easy to go back to stock and keep your Bad Boy if you ever sell the truck.


Either approach takes a load off your existing (old, tired) horn circuit, because you either bypass most of it completely (with the factory approach) or you substitute a relay for the horn load on the circuit, which is a much lighter load. (Typically around a quarter amp.)

:beer:
 
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