Aftermarket horn install question

[thdrill]

I am in need of replacing my OEM horn in my 2003 Tahoe as every time I hit the horn now for more than 5 seconds it blows the fuse. My question is I am interested in looking at some aftermarket models but note that they all seem to be a single wire installation while my OEM appears to be two, let alone horns on both sides of the vehicle combining into one. Is there something I'm missing as I can't seem to figure out how to put this puzzle together. Any assistance would be welcome.

Thanks

 

[NathanJax]

Instead of using the horns power/ground, you need to add a relay and have the OEM horn button trigger the relay to turn on the aftermarket horns.

 

[vjr021]

Get yourself a set of the Hella horns... Classic tone.

 

[Mr. 960]

one wire horn is just positive wire, and the metal horn grounds itself. GM started using two wire horns, power and ground, do to many cars having a lot of plastic/composite materials resulting in a poor ground. As long as you install to the frame or core support you should be fine with just power. Use a volt meter to locate the power lead form your original horn weather pack connector. As stated above, if these new horns draw a lot of current, use a relay to power them.