Replacing an Electrical Timer with a Mechanical Timer in Battery Chargers
If your battery charger’s timer has failed—or you’re simply looking for a more affordable, reliable option—switching from an electrical timer to a mechanical one is a smart upgrade. Mechanical timers cost about half as much, are easier to wire, and don’t require power to operate. In this guide, Rick from PLP Battery Supply walks through the full replacement process using an Associated 69A charger, explaining the wiring differences, tools you’ll need, and how to safely install and test the new timer.
You’ll learn how to identify timer wiring, remove the old electrical timer, connect the mechanical replacement, and manage cables for safe operation. The guide also includes troubleshooting tips, a simplified wiring breakdown, and solutions for common issues like mounting differences or knob alignment. Whether you're maintaining workshop equipment or repairing chargers in an industrial setting, this upgrade can extend the life of your charger while saving money and reducing maintenance headaches.