The horn is drawing the same amps as before so if you installed a new "12V" harness Actually, the horn will have the same resistance (or more properly impedance) as before, but because the voltage is doubled the current (amps) will also double. AND IT WILL BE REALLY LOUD, at least for a while.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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