scotta68 Posted June 25, 2014 #1 Posted June 25, 2014 I bought 2 Wolo horns as mine are pretty quiet. I looked at Freebirds write up but I'm not a very skilled auto electrician but can get it done with a little direction. I need to know if there are different relays and which 1 to get, then how to wire the horns. Thanks
scotta68 Posted June 25, 2014 Author #2 Posted June 25, 2014 Thats what I'm looking for.. Thank you !!
bongobobny Posted June 25, 2014 #3 Posted June 25, 2014 You want a SPST (Single Pole, Single Throw) NO (Normally Open) relay, but buy the setup from Larry, most of the work is done for you!
MikeWa Posted June 25, 2014 #4 Posted June 25, 2014 +1 on the harness from Larry. About relays. You are going to want a 4 terminal relay. Sometimes a five terminal is ok because one terminal will be left unused. Each relay can be considered as two devices. A control device and a power device. The power device portion is easy. It's two terminals are usually slightly larger. One terminal is connected to the battery. Use a fuse in this wire. The other terminal is connected to the horn or whatever you want to power up. It is sometimes pictured with a switch between two terminals in the schematic on the back of the relay. Just remember whatever you provide power to with the relay will still need a ground wire. The control circuit also uses two terminals. They are often the smaller terminals. What the control circuit does is to internally flip the switch of the power circuit. Thereby switching your device on and off. One terminal of the control circuit is connected to ground. The other terminal is connected to a switched power source such as a horn switch or a light switch. This circuit is often shown as a square or coil between two terminals in the diagram on the back of the relay. Some relays also show a diode in the control circuit making it polarity sensitive Activating the horn switch will then activate the relay control ckt which will activate the relay power or load circuit and your device will turn on. On the Yamaha relay pictured the control terminals have the square box. The power terminals would be terminals 30 and 87 or 87a. Mike [ATTACH]85301[/ATTACH]
djh3 Posted June 25, 2014 #5 Posted June 25, 2014 Study up on the horn circuit. It acts backwards. The ground is controlled not the power. So when you hit the horn button you are connecting a ground not power.
MikeWa Posted June 25, 2014 #6 Posted June 25, 2014 (edited) Study up on the horn circuit. It acts backwards. The ground is controlled not the power. So when you hit the horn button you are connecting a ground not power. Point taken. You would have to make adjustments for the reversed set up. Mike [ATTACH]85396[/ATTACH] Edited June 29, 2014 by MikeWa
bill4you502 Posted June 26, 2014 #7 Posted June 26, 2014 Bought a "Bad Boy" air horn and used Carbon1's bracket & wire harness. Installed w/ no difficulty!!!!
scotta68 Posted June 26, 2014 Author #8 Posted June 26, 2014 Appreciate all the feedback. The horns are not the Bad Boys, just 2 Wolo auto horns and was looking to mount them in the stock locations. The instructions show how to connect them for a 1 wire power source. With the relay, i should be able to do this ?
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