new battery.when running metor shows 12.40 at the highest.new starter.battery charged two days ago.checked today before start.12.13 v after start would only go up to 12.40 v.im not sure but i would think it should go higher. thanks for any help

 

Welcome to the forum WILD4452,

I've moved your question from General Tech Help to X308 forum. Members here with the same model will be able to help.

Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some info about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.

Graham

 

So after the vehicle starts, the voltage never goes about 12.4? If that is the case, that alternator is either not charging, or the voltage is dropping off before the battery. Check the charging at the terminal on the back of the alternator. If the voltage there is only 12.4 volts, the alternator is bad. If it is 14-15v, you have to find where you are losing the voltage.