I found that both roof horns on my previous & current Dolphins has shopped working, the 2 auto horns under the hood where OK. When dis-assembled, both had dirt and
bugs inside that needed cleaning, but what really was preventing them from working was an adjustable set of contacts(or points) in each horn. The contacts may need cleaning, and maybe even the contacts gap needs slight adjusting as the gap between the metal diaphragm and magnetic coil has to be such that the diaphragm oscillates creating the horns sound. If the gap is adjusted, apply loctite after. These 12 volts horns need lots of current, I had to take a 12 Volt ATV battery up on the roof to power them when adjusting the points and testing them as a 12 volts power supply couldn't supply the current they needed.
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Ellen & Greg
08 National Dolphin DL-35Ci, RoadMaster Rear Sway Bar, Rear Trac Bar, Koni Shocks Front,
Workhorse W22, Kelderman Air Ride, Towing 2016 Smart Car
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