Jul 10, 2009 · The horn itself looks brand new, but there is some rust or corrosion around the hole where the wire from the horn relay goes into the body of the horn. There is another electrical contact on the bottom of the horn that is electrically isolated from the body of the horn. There is nothing externally attached to the contact.
If it's negative, the wiring is the opposite of what you expect. For example, it happens that the red wire coming out of the connector shown here is actually the ground wire and the black one is the power wire. You'll notice that the original wiring in the bike has entirely different colors (green and brown) so that this confusion is avoided.
For some reason, dual horn relay wiring harness kits are difficult to find lately. When I first connected the Hella trumpets, I simply spliced into the existing wiring harness to power the pair, without a relay. That worked fine, but it is best to use a relay when adding either a more powerful...
If this wire happens to get shorted, it will keep blowing fuses and the short circuit may be hard to find. If you switch the ground connection, the worst case scenario is that the relay will turn on when the wire becomes shorted to ground. This will also make it much easier to find the shorted part of the wire and you won't blow any fuses.
Nearly all types of terminals should be fitted to the wire with crimping pliers . There are a few types such as the `Scotchlok' which are secured by clips. For additional security, you can add solder to the wire. Use a 25-65 watt iron for most work, and a 150-250 watt one for large cables, or an 8 oz (225 g) gas-heated iron.
I have a 2010 Frontier which does not have the factory towing package. I am confused on what wiring harnesses are needed for towing. The 2010 Nissan Towing Guide states that all Frontiers are pre-wired for trailer lighting, and the relay box under the hood has a 15A fuse for trailer turn signals, and a blue relay for trailer turn RH, and another blue relay for trailer turn LH.
Primelux PWH-011401 12ft 14 Gauge Relay Wiring Harness For LED Light Bars - 12V 40A Relay & 3-Pin On/Off Rocker Switch & Waterproof Fuse Brand: Primelux Model: B0719JBRZS
The air horn is a standard 12vdc car air horn and is powered with an 18V cordless drill battery. Now connect a wire going from the blue wire on the receiver to the "86" slot on the relay, I chose a green wire so I could tell the difference from the black and white wires.