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2009 nissan titan charging problem

3K views 4 replies 4 participants last post by  bowie157186 
#1 ·
I have a 2009 nissan titan a couple days ago the battery an brake light started flashing, so I changed the alternator and I'm not getting any charge going to battery. new alternator has passed test and battery has passed test, when I check voltage on battery is 12.4 not running and 12.9 running any ideas what it could be? iv spent 3 days going through stuff an I cannot find a problem any help is very well appreciated!
 
#2 ·
update I got a code c1131 off the check engine light, I cranked it up an drove it an it was charging great an all a sudden the headlights start dimming an the battery and brake lights started flashing again on the panel... what would make a alternator charge at one point an not charge an start charging again? maybe a short in wires, grounds, ecm?
 
#3 ·
My first guess would be a bad ground. Check your battery connections and trace the various grounds around the engine, trans, etc.
 
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