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Most of the 12v motorcycles made by Honda in the late '60s to the early '70s fell into 2 distinct categories of electrical design. There are what we call the "Early" motorcycles, which primarily came before 1973, and the "Late" motorcycles from 1974 and on. The headlight circuit is no exception. In this article, we will cover the early style headlight and gauge light circuit motorcycles that used a single 15 amp fuse on their electrical systems. We will cover how this circuit is generally set up on these motorcycles and how to troubleshoot every part and piece within it.

Buy parts and pieces for your vintage Honda motorcycle at commonmotor.com

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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  
   • CB550 / CB500F  
   • CB750  
   • CB350F / CB400F  
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Contents of this video:
00:00 Introduction
00:21 Compatible Models
01:21 Tracing the Circuit
04:57 The Headlight & Running Light Simplified Wiring Diagram
05:24 The Headlight Bulb
07:40 The Headlight Wires in the Right Handlebar Switch
09:14 The High Beam Indicator
10:08 The Gauge Light Wires in the Right Handlebar Switch
11:28 The Gauge Light Bulbs and Socket
13:50 Demonstration of a Properly Running Circuit
16:22 Wrapup