Funny

[Elliott]

Hopefully this isnt an old post, but I just saw it for the first time; Is this somebody from the board? Makes me think of Adam.



http://www.liveleak.com/view?i=6f7d783550

[Robert Gift]

That is funny.
Did he hide the horn in the engine compartment?

What kind of horn should we obtain for an emergency vehicle?
Just a short blast for drivers unable to hear the siren.

[q2bman]

Why grover Stutter Tone horns of coarse.

I got one off Ebay for 60 bucks.

[Robert Gift]

Why grover Stutter Tone horns of coarse.
I got one off Ebay for 60 bucks.

Jerk....Wish I could have purchased it!
(You wannabe my eBay pimp?)

Did that include the air tank and compressor?
Where does one hide that crap in an Expedition?
(Does it even have an air tank?)
If no air tank, how many amps does it draw to operate?

Had an emergent delivery to a hospital New Year's Eve.
The next evening, our Expedition 130 amp alternator failed when driving home.
So glad it did not fail the previous day.

Turned off all electrical power, but had to keep lights on.
Lights eventually dimmed to the point I expected Aurora PD to have a fit had they seen me. (Streets were well lighted.)
Engine died when battery drained before I could make it home.
Coasted into a church parking lot and stopped in a space. (Church where my former girlfriend was organist.)
Took battery home and charged it. Then drove vehicle home the next morning.

Luckily I did not have much trouble putting in a new (rebuilt) alternator.

Thanks, Q

[SirenEnthusiast360]

Is there any way to wire that to the carhorn of the truck, so that when you push the horn button on it, it sounds the airhorn and not the regular car horn?

[Robert Gift]

It would be easy.

Find the wire from the horn relay and splice a single pole, double throw switch in the line.
The horn relay should handle the amperage needed for the airhorn valve.

Flip switch down to have car horn sound.
Flip switch up to sound the air horn.
The switch must be rated to handle enough amps for the airhorn valve.

I would not try to find the horn wire from the steering wheel.

Better, have a separate pushbutton switch for the airhorn alone.

[Elliott]

Is there any way to wire that to the carhorn of the truck, so that when you push the horn button on it, it sounds the airhorn and not the regular car horn?

Robert's way would work just fine, but another way could be to install a secondary automotive relay with a power switch to it's coil inside the vehicle. Cut the positive wire to the horn, connect the "source" end of that wire(from stock horn relay) to the COMMON of the new relay, the car horn to the NORMALLY CLOSED contact, and the positive for the air compressor to the NORMALLY OPEN contact. By energizing the coil with the switch, it merely interrupts the stock horn and routes power to the air horn when you honk the steering wheel. I wouldn't leave the relay on all the time, but just when you need a little more HONK. By this method, current doesnt have to travel all the way to the car interior and back out to the horn, but only the current running the relay does. That is, considering you have room for the compressor in the engine compartment!

BTW, some automotive relays have a diode across it's coil. This is because when you de-energize a coil, the resultant magnetic field collaping is re-induced back into the coil and a voltage spike is generated and spit-out, so-to-speak. It's the same as an ignition coil, the high voltage doesn't start until the low side (primary) is de-energized. A diode clamps this spike by basically shorting it out. The diode is in REVERSE polarity to the normal connection, so you must observe which side of the coil you connect to ground. Otherwise you will cook some fuses or the diode itself! The diode symbol looks like a triangle pointing into a perpendicular line. The triangle side is anode (+) and the line is cathode (-). The anode side would actually be connected to ground and cathode to your positive switch to work correctly.

[Robert Gift]

(+) ->|- (-)

[q2bman]

Ya, I have yet to hook it up. I've been moveing. I plan on installing it under my Jeep on the frame. I have a 5 gallon tank for the back of the jeep and a "blow gun" valve for the horn button. I can not wait!

And ya. You could mount one in a Ford Expedetion.

[q2bman]

oh, and no. I only got a horn. Bought the other stuff at everything mart (also known as wallmart)