Battery Tester's Unpredictable Signals Interpreting Fluctuations On the Road

It might be a good idea to take an actual voltmeter and test your battery's resting voltage. If it's 12.3 then it's chronically undercharged, ... I replaced the original battery this past January and had no issue until this past weekend in the middle of a 900-mile road trip. While cruising ... It's caused by “clever” charging algorithms designed to save a few ml of fuel. This algorithm should only charge the battery once the battery ... (A) Ensure you have a good solid ground strap from the Battery to the Engine and 2 A solid strap from the Battery to the Chassis, (B) Also check ... Ford has a battery management controller in these vehicles these days, and because it is running an AGM battery rather than the traditional lead ... Sounds like a bad battery, but I would also check the output of the alternator to make sure it's up to par. You need to see at at least 13.5 ... ... battery and alternator, the two most common electrical problems in your car or truck! Check out this playlist for more DIY diagnostics tips ... I don't drive it that often. Maybe it's normal and something to do with recharging the battery after extended idle periods. Has anyone else ... This is a battery maintenance function, not a electronics operation function. When batt needs more charging, ECU commands (regulates) alternator to meet that ... Testing the battery, with the car on (headlights and heater on ... mine fluctuates, startup its around 12.8 for a while until i drive ...