A new battery or one that tested good is in the vehicle and the car is still losing power. the alternator is what charges the battery while the vehicle is operating.
alternator charging too high need replacing per dealer
i need to know where the alternator is located on a 1990 Lexus LS400
see this link How_can_you_tell_if_it's_your_battery_or_alternator_that's_bad
Any auto parts store can tell you.
Check the voltage at the battery with engine running. It should read 13.5 to 15.5 volts. Any less and the alternator is suspect.
This is a dual-field alternator, they both are field connections.
you need to replace the alternator
Need more info. Need to know what make, model and engine size to help you.
if your truck is running and you disconect the batery and the truck dies then its the alt
elecronics need fixing or alternator need replacing elecronics need fixing or alternator need replacing
An alternator does not need a gauge to work. It is used to monitor the output of the alternator.
i need help with my new alternator.