The Horn Circuit: Electrical Troubleshooting and Basics on a Vintage Honda Motorcycle

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Be sure to watch our understanding ground circuit and positive circuit before troubleshooting your ignition circuit:

   • Understanding the Ground Circuit on a Vint...  
   • Understand the Positive Circuit on a Vinta...  

It can be easy to overlook the simple circuits on a vintage Honda. The horn circuit may be unassuming, but a little detail goes a long way in better understanding every last inch of your motorcycle. When it comes to the 12v positive side of the circuit, things are pretty standard but we find a lot of people are stumped with how the horn connects to ground when pressing the horn button. In this video, we are going to help you understand the basics of the factory Honda horn circuit wiring and how to individually test each component to discover what is at fault and what works as it should.

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Need help with your vintage Honda? Attend the CMC Repair Academy and watch the full playlist of repair videos for your motorcycle:

   • CB175/CL175/SL175/CB200/CL200  
   • CB350/CL350/SL350  
   • CB360/CL360  
   • CB450/CL450/CB500t  
   • CB500K / CB550K / CB550F  
   • CB750K / CB750F  
   • CB350F / CB400F  
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Contents of this video:
00:00 - Introduction
00:21 - Horn circuit background knowledge
00:50 - Tracing the circuit
01:38 - Testing the horn
02:24 - Testing for 12v positive power
02:53 -Testing the handlebar ground connection
03:15 - Testing the horn button
04:01 - Testing the complete circuit
04:17 - Outro