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Old 08-16-2013, 07:27 PM   #1
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Need help on electrical question

In the middle of installing Kleinn horn and don't understand the part of directions that state I am to connect pin 3 to pin 1 and at the same time I am to ground pin 1. How do I get it two connections onto one male end. If I use a jumper wouldn't I be grounding pin 3 and pin 1?
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Old 08-25-2013, 07:17 PM   #2
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In the middle of installing Kleinn horn and don't understand the part of directions that state I am to connect pin 3 to pin 1 and at the same time I am to ground pin 1. How do I get it two connections onto one male end. If I use a jumper wouldn't I be grounding pin 3 and pin 1?
Pin 3 is not a neccessarily a ground or positive. It depends on pin 1 once it is spliced into it. If you splice into the pin 1 wire with the pin 3 wire, then pin 3 becomes charged as pin 1 is charged. It seems to depend on the setup of your horn. Where electricity is concerned, I would find out which type of the "two horn types" that you have, and contact the manufacturer to find out which way to connect pin 1. It could mess up circuitry and burn things up, making a ground, positively charged, without knowing the proper setup for your particular vehicle.

It seems to be saying that if your horn is a negative horn system then pin 1 is positively charged (+) 12 volts. If your horn system is positively charged, then pin1 is negative, and grounded. Like the instructions say, I would determine the charge of your horn wire. Splice into it, with a electrical tester, and ground the tester. Probe the wire. If it lights up, it is a positive horn wire. Then, according to the schematic, you would should ground pin1 and pin3 will be grounded since it is spliced into it. If your probe doesn't light up, then check it as defined in the instructions for negative resistance, and pin 1 is connected for positive charge.

But, I would first confirm your findings with the manufacturer to avoid electrical disasters.

The negative connector on the compressor is ground.

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Old 08-25-2013, 07:53 PM   #3
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It is recommended that you add a 20amp fuse to your pin1 wire, if you have a negative horn wire system, since in that scenario pin 1 is (+) 12 volt charged. This will prevent you from ruining your electrical system in case the unit shorts out or overloads.

But, to be safe, I would contact the manufacturer for confirmation of your findings and your understanding of how to set it up. In this case, it might hurt not to ask.
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Old 08-25-2013, 09:52 PM   #4
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ChasUGC is correct, the setup is dependent on the polarity of your vehicle's horn system, or rather, where you get the horn wire. If you are doing your wiring under hood, you will be grabbing your horn wire at or near the horn itself, after the horn relay. This will give you a positive switching horn system, so you would need to connect pin one to ground. If you're doing the wiring inside the cab, you will likely find a thinner horn wire that will be after the horn switch, but before the horn relay; this will give you a negative switching system. You would then connect the relay as shown in the diagram.

The fact that they named the terminals 1-4 is a bit silly, as you are really using a standard relay with terminals commonly referred to as 85 (Pin 2), 86 (Pin 3), 87 (Pin 1), 87A (not used here) and 30 (Pin 4). It would seem like you are shorting your negative horn system by jumping terminals 86(3) and 87(1), but they are actually isolated from the ground you are applying on terminal 85(2) when you press the horn. The fuse on pin one is needed only to prevent a short circuit from damaging your air compressor that is connected to terminal 30(4); it doesn't protect your vehicle's horn wire at all. If you really want to protect the horn wire, you could throw a fuse on the wire you tap into the horn, as close to the actual spice as possible. Use a 1-3 amp fuse for a negative horn wire, and a 15-20 amp fuse for a positive horn wire. This really isn't needed, though, especially when it's a negative switching wire.
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Old 08-26-2013, 02:26 PM   #5
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Thanks for the input. I am no where near an automative electrical expert but the set up just didn't "feel" right. I did call them and it turns out their directions were wrong. When I had everything set up according to their directions, the relay was getting power (I could hear the switch) but it wasn't giving any power to the compressor (which was in perfect working order). I did post the correct way on a separate thread to wire the Kleinn horn (if you're putting it on a separate button than OEM) with my own artsy diagram. I wasted way too much time on their directions and couldn't find anything online to help me out. Hope my diagram helps.
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