Not sure I understand the problem. Do you mean when you turn lights on and drive car the battery eventually drains down to the point you will need a "jump" next time you need to start it?
Check for clean contacts on battery Check battery to see if it's got good cranking amps Check Alternator to see if it's charging the battery when engine on
Engine Test Stand Playlist: https://www.youtube.com/playlist?list=PLwoxyUwptUcdqEb-o2ArqyiUaHW0G_C88 restoring my 1968 Firebird 400 HO convertible (Firedawg) 1965 Pontiac Catalina Safari Wagon 389 TriPower (Catwagon) 1999 JD AWS LX Lawn tractor 17hp (my daily driver) 2006 Sequoia 2017 Murano (wife's car) 202? Electric car 203? 68 Firebird /w electric engine 2007 Bayliner 175 runabout /w 3.0L Mercuiser__________________________________________________________
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
Recently replaced my voltage regulator, jumper the number 2 and number 4 wire going to the regulator and checked the voltage at the battery, was pushing 17 volts, so I knew the alternator was good. One thing to look out for; my old regulator had a ground wire, so reused it with the new regulator, was grounding out, worked fine after removing the ground wire.
