Question about Cars & Trucks
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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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
WEll, that is one idea, but I reccomend against it, as the brake light system is tied into the circuit, commonly. Just fix the t/s switch.
Posted on Sep 10, 2009
Check for good wiring to the grid.Take the two wires off of the grid and use one end to a load[such as an old headlight bulb or what ever you can find that pulls around 5-10 amps].A test light can be used but it draws no wheres near as much power as the grid does but it will get you started.Put a test lead from each of the grid wires to your load source or test light to see if it works or lights.If the load is dim or turning slow[if all you found was a fan motor or something like that] then you need to find out if it's a bad ground or a corroded power wire.Put the load from the power side to a good ground elsewhere on the vehicle and if it works normally then you have a bad ground.If it still doesnt work like it should then you need to trace the power circuit wiring.This is not brand specific it's just general electrical trouble shooting advise so i hope it help[s you out,a volt meter will show you voltage even if only one strand of wire is still connected so this should be doe when ever electrical problems appear to be normal but still don't work.
Posted on Dec 19, 2009
SOURCE: I have a 2003 Alero,
There is a connector going to rear defrost on the rear window. Disconnect this and check for voltage with defrost on. If this is good, check resistance for the connection to window. This will tell you if the electrical is working or the element is bad for the window if there is a open reading on multimeter.
Posted on Dec 03, 2010
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