{"product_id":"autool-obd-ii-memory-saver-cable-12v-digital-voltage-current-display-3a-fuse-and-anti-reverse-protection","title":"AUTOOL OBD II Memory Saver Cable 12V — Digital Voltage \u0026 Current Display, 3A Fuse and Anti‑reverse Protection","description":"\u003cstrong\u003eAUTOOL OBD II Car Memory Saver Cable keeps your vehicle’s ECU powered during battery replacement and helps locate battery-draining circuits with real-time voltage and current readouts.\u003c\/strong\u003e\n\n\u003cp\u003eIf you need to change a 12V car battery without losing on-board memory or want a simple way to detect electrical leakage, this compact OBD II memory saver supplies emergency ECU power while showing live voltage and current. It plugs into the vehicle OBD port and uses an external 12V DC source—like a spare battery or running starter—to maintain settings and monitor current draw. The unit includes a 3A fuse for overload protection and anti-reverse connection safeguards to prevent damage from incorrect hookups.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this cable preserve ECU memory during battery swaps?\u003c\/h3\u003e\n\u003cp\u003eWhen the car’s main battery must be disconnected, the AUTOOL cable supplies continuous 12V power through the OBD port so the vehicle’s ECU and other modules don’t lose learned settings or radio codes. This avoids reprogramming sequences and preserves stored faults and calibration data.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUses any 12V DC source (spare battery, running starter, or power outlet).\u003c\/li\u003e\n  \u003cli\u003ePlugs into the vehicle OBD II port for a direct ECU feed.\u003c\/li\u003e\n  \u003cli\u003eBuilt-in 3A fuse provides overload protection during swaps.\u003c\/li\u003e\n  \u003cli\u003eAnti-reverse design prevents powering if connected backward.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan this device help find battery drain or electrical leaks?\u003c\/h3\u003e\n\u003cp\u003eYes—the integrated digital display shows voltage (red) and current (blue), so you can monitor changes as you remove fuses. By unplugging fuses one at a time and watching for current drops, you can isolate which circuit is drawing abnormal current and trace the offending component.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eLive voltage and current readout for precise measurements.\u003c\/li\u003e\n  \u003cli\u003eWorks by comparing current before and after removing fuses to locate leakage.\u003c\/li\u003e\n  \u003cli\u003eUseful for tracking parasitic drains caused by accessories or faulty modules.\u003c\/li\u003e\n  \u003cli\u003eRequires main battery disconnected for load to be drawn from the external source.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat safety features and warnings should I follow when using it?\u003c\/h3\u003e\n\u003cp\u003eThe AUTOOL memory saver includes a replaceable 3A fuse and anti-reverse connection protection to reduce risk during use. The display flashes and warns if abnormal voltage or current is detected. Always ensure the vehicle power is off during battery replacement and avoid performing other electrical work while the external source is connected to prevent sudden current spikes.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e3A fuse protects against overloads; replace if blown.\u003c\/li\u003e\n  \u003cli\u003eDigital alerts for abnormal voltage\/current conditions.\u003c\/li\u003e\n  \u003cli\u003eAnti-reverse clamp prevents powering when hooked up incorrectly.\u003c\/li\u003e\n  \u003cli\u003eDisconnect vehicle main battery and avoid other electrical operations during swap.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I set it up with a spare battery or starter?\u003c\/h3\u003e\n\u003cp\u003eConnect the memory saver’s alligator clips or fused lead to a 12V DC source, then plug the OBD connector into your vehicle. Confirm the digital readout shows expected voltage and that current flows when the vehicle’s main battery is removed. If the main battery remains connected and charged, no current will flow from the external source, so removal is necessary for proper operation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAttach clips to the spare 12V battery (observe polarity).\u003c\/li\u003e\n  \u003cli\u003eInsert OBD II plug into vehicle connector to feed ECU power.\u003c\/li\u003e\n  \u003cli\u003eVerify voltage\/current on the display before starting replacement.\u003c\/li\u003e\n  \u003cli\u003eEnsure main battery is disconnected to allow load from the BT30 circuit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The AUTOOL OBD II Memory Saver is designed for professional mechanics, DIY enthusiasts, and fleet technicians who regularly replace batteries, troubleshoot parasitic drains, or want to protect vehicle settings during maintenance. It's practical for anyone who needs a compact, easy-to-read tool to maintain ECU data and quickly locate electrical leaks without bulky equipment.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will the memory saver work with any 12V car?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, it works with standard 12V DC systems; use a spare 12V source and ensure the vehicle’s main battery is disconnected during operation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What does the 3A fuse protect against?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The built-in 3A fuse guards against overloads; replace it if blown and avoid reverse connections to prevent damage.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"AUTOOL","offers":[{"title":"Default Title","offer_id":48085903474846,"sku":"B0DB8G6B1Z","price":42.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/autool-front-connector-and-display.jpg?v=1785880197","url":"https:\/\/northtrailauto.ca\/products\/autool-obd-ii-memory-saver-cable-12v-digital-voltage-current-display-3a-fuse-and-anti-reverse-protection","provider":"North Trail Auto","version":"1.0","type":"link"}