FREEWAY BLASTERS HORN INSTALLATION
Technical specifications:
Sound Output: 132 dB
Operating Voltage: 12 Volts
Absorbed Current: UNKNOWN less than 10A??????
Fundamental Frequency: HIGH LOW tones like a car, actual frequencies unknown.
I found the Blazer horn at Autozone and the other at Pepboys for $15.99 and $19.99 respectively.
Using the stock mounting horn, you use the small flat predrilled pieces of metal which come with the horns to mount them to the horn mount . With a nice bolt, nut a lock washer, these are stable as seen below. Ground each horn by placing the crimp style eyelet terminal on the back of the horn bolts and tighten them down. Use loc-tite as well.
I used 12ga. wire, (that's what I had handy, you could go 16 ga. without a problem), to run from the battery to a 30amp inline fuse then snaked the wired under the edge of the tank and used tie wraps to secure the wire. The wire comes out in between the radiator and the engine where it drops down to the relay. Crimp terminal connectors are required as well as wire because the horn comes with; the horn, 1 relay,1 bolt and 1 nut and that's it. The relay is a standard 30 amp automotive type with 4 terminals. Here we go. The Power lead snakes is more or less where the stock leads were positioned.
1. You simply pull the 2 wires off the back of the stock horn and plug them into to pins 85 and 86 on the back of the relay. It doesn't matter which goes to which because these 2 terminals (only these 2) are not polarity sensitive.
2. The hot wire from the battery goes to pin 30/51 (could be labeled as either)
3. You take the last pin, 87, of the relay and take that to the + terminal on the air horn.
4. The horns have one other pin besides the one mentioned in Step #3 and it is ground. So you will need to take this last pin to ground the best way you can. I used the bolt which holds this entire apparatus to the frame as my grounding point.
Since I do not know the amps pulled when these are engaged I can not say that you could bypass the relay route and just drop a parallel power lead to the horns off the stock circuit. Try it see what happens if you pop the fuse then do the relay route. If you are going to use the accessory jacks under the seat or in the headlight bucket, make sure you haven't tacked other devices such as spotlights into those connectors. The accessory fuse is only a 10 amp fuse. You make the call how you want to install it. I personally believe in separating/isolating circuits from one another. It's just the way I do things.
I have noticed that in this part of the country where the humidity and temperature are high during the summer months, air conditioners in cars run all the time, windows up, radios on, drivers in their own world of coolness and surrounded by music. Most of the time when I have to use the horns, I HAVE TO USE THE HORNS and I lay in to it to get their distracted attentions. We aren't talking little "toots", we are talking a 3-6 blasts. You would be amazed at people in their cars do not respond to a 132db horn screaming right next to them when they are cutting you off, or pulling out right in front of you and the continue unaffected. Or perhaps you wouldn't be amazed. Anyway, cooler weather is a different story where people have their windows down or cracked more often.
Wiring Diagram Click to Enlarge
