I tried restoring several old horns that would only Humm when using a battery charger to power them. Changed to going direct to a 12 volt battery and every one I have tried to restore since has been a success. They need lots of amperage to make them go. Dave

1941 Chevy
"First rebuild - complete!"
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1941 GMC resting peacefully
1946/1947 Chevy Street rod on s10 frame complete
1945 GMC panel truck in line for restoration
1941 Plymouth stock complete
1941 GMC COE in restoration process
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1941 Chevy Coe uncertain future resting now