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Posted on Jan 02, 2017
Assuming you don't have any other problems to deal with like a bad horn relay, you would want to intercept the horn signal wire going up into the steering column and wire that to the switch such that it gets grounded by the switch when you want the horn to honk. Since a toggle switch could be left on for an extended amount of time, I would think a momentary switch of even a push button type might be a better choice?
The horn relay is used to allow for large current flow going to the horn itself without forcing that same amount of current to flow thru the horn switch in the steering wheel for example, which might be easily burnt out without the relay's buffering effects. Even a large macho toggle might not be able to handle a horn's current if used regularly. The load for a raw horn is highly inductive (arcing,sparking) in addition to being a very large current draw of 10 amps or better, both conditions tend to make kindling of everything but the most robust switches. Those switches when you do find them cost the big dollar$.
You might just need a horn relay, they do have a lot of work to do - they are allowed to wear out occasionally considering their use.
Posted on Aug 28, 2009
You should not try to wire the switch to the actual switch harness, instead identity the relay that powers the defrost, because toggle switches are only to switch power on and off to a device.
Posted on Nov 25, 2014
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