Re: 1940 356 Rebuilt and running but horn problems

Posted by HH56 On 2014/4/9 9:20:47

Not entirely sure where the horns are located on a 40 but if on the head like the 47, any chance the engine rebuild has a nice coat of paint and some sealer around the head studs and other various bolts. If so I would seriously look at a ground problem. Horns need a pretty healthy amp flow so large wires and good ground are a must. A poor ground, dirty connection, and/or testing with too small a wire would result in your symptom. A poor ground might be adequate for the relay draw but not the horns. To rule that out, you could take a jumper cable and go from a good frame ground to a nice shiny place or bolt directly on the bracket or horns and see if that changes the situation.