Join Date: Oct 2011
Location: Vallejo, Solano County, California
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According to the Hella web site, these horns draw 5.5A each, 11A for both. The factory horn circuit is fused at 15A. Nothing will "fry", but I like to see more like a 2:1 margin between fused and expected current.
I'm with Zoomzoom on this one . . . just trigger off the factory horn. There is no benefit to running extra wires into the steering column or relay module, and lots of opportunities for disaster.
Here is the circuit I would use if installing the horns in my truck. You can leave the factory horn(s) connected for "mega-loud", or pull off the connector . . . . your choice.
The inline fuse and Bosch automotive relay are available from Radio Shack, Amazon, Parts Express, WalMart, etc., for less than $5. A relay may have even come with the horns.
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