weak horns on 51 ford sedan

[Barry B./ Ma.]

Any one have weak horn problems? Mine were always strong on my 51Ford sedan but they went weak after long storage. What is the best way to analyze the problem, I already put in a new relay and plan to add another ground wire as the next step, I have been cautioned not to spray oil into the trumpets so don't know what to do next, any suggestions would be appreciated. By the way, they are mounted under the hood on a long bracket. Thanks in advance, Barry