One will work if the other is bad, however, its entirely possible that you have two bad horns. Of our cars, my dad's SD needed a new high tone horn, I needed a new low tone horn (but I replaced both  ) And the 300D needed both, they were completely rusted out/gone! I put a pair of stebel horns on the 300D...we had them laying around. No genuine MB honk, but they are quite loud!
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-diesel is not just a fuel, its a way of life- 
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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