Horn on ' 96 C280

My horn got stuck on my '96 C280 to the point of burn out and I tried to replace them myself (no mechanic here). I bought original parts (2 horns) from a dicount parts dealer who assured me these 2
horns were the ones for my car. The boxes do say Merce-Benz Original they are identical looking and a tiny bit smaller than the originals. Originals are marked one with 400Hz and the other with 500Hz. The new ones dont have any markings and look identical. They are not working after what looked like a very easy install and now neither is my ac. Any suggestions? Peter F.
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Check your fuses.
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