Connecting a Memory Saver Obd2 device is crucial when disconnecting a car battery to prevent data loss in the vehicle’s computer. However, using the wrong power supply can lead to serious damage. High current supplies, like some jump starters, risk causing battery explosions or severe burns due to accidental grounding. A safer approach is using a low-amp charger, such as a NOCO G3500, with a maximum output of 3.5 amps. This type of charger provides sufficient power to maintain the car’s memory without the risk of high current damage. Even a simple 1-amp power supply can effectively preserve vehicle memory during battery disconnection. Short circuits with these low-amp devices simply reduce the voltage without causing harm.
Using a high-powered jump starter with an override function, like the NOCO GB40, for memory saving is not recommended. These devices rely on sensing resistance from a connected battery to regulate their output. With the battery disconnected and only a small load present (around 70mA from the OBD2 port), the jump starter’s behavior becomes unpredictable and potentially dangerous. The high current output could damage the vehicle’s electrical system.
If you’ve experienced a total system shutdown after attempting to use a memory saver, you likely blew a fuse. Many vehicles have a 7.5-amp fuse protecting the OBD2 port’s 12v line. Check this fuse and replace it if necessary. Additionally, thoroughly inspect your battery connections for secure contact. Using a voltmeter, measure the voltage at the battery posts and terminals. A reading of around 12.6 volts indicates a healthy battery. If the voltage drops significantly at the terminals, there might be a connection issue. Addressing these potential problems can restore power and resolve the system shutdown. Always prioritize safety when working with car batteries and electrical systems. Choosing the right memory saver OBD2 power supply and understanding the potential risks involved are essential for protecting both yourself and your vehicle.
