How to test a small engine charging system, battery & alternator?
Learn how to check your small engine battery charging system and alternator for common problems.
1 min read
Briggs & Stratton Admin : Updated on January 13, 2026
Briggs & Stratton sells electrical components only for engines. If you are replacing or rebuilding parts of the small engine on your lawn mower, snow blower, or other outdoor power equipment, the basic schematics or wiring diagrams of our alternator systems are available in our guides below:
In addition to wiring diagrams, these guides also provide information on Alternator Identification and procedures for an engine replacement with a new Briggs & Stratton engine that utilizes a different style alternator (output connector).
If you wish to perform any required small engine maintenance or repairs yourself, a good source for engine specifications and technical servicing information is a Briggs & Stratton® Engine Repair Manual.
For assistance in locating your engine model number, please visit our How do I identify a Briggs & Stratton engine? FAQ.
Still have questions about your small engine? Contact a Briggs & Stratton Dealer for assistance.
For a detailed schematic specific to your piece of equipment, contact the Original Equipment Manufacturer of your product.
Learn how to check your small engine battery charging system and alternator for common problems.
Learn how & where to find the right spark plug and a gap chart to guide you through gapping spark plugs in this Briggs & Stratton small engine FAQ.
Need lawn mower gas? Find small engine fuel type and storage recommendations for max performance from the Briggs & Stratton Engines experts.