LOW VOLTAGE 2009 dodge ram 6.7l diesel

[der24]

I have a 2009 dodge ram, my voltage gauge shows a low reading of 12v and the batteries die out when i drive it. we tested the alternator on a tester the reading was 14.5 but when installed in the vehicle the gauge does not rises to 14.5v, I need help this is extremely frustrating because i just bought the truck, and the etc light is also on.

 

[BLNRAY]

Grounds,ck all you can find,load test batteries

 

[PWong]

I have a 2009 dodge ram, my voltage gauge shows a low reading of 12v and the batteries die out when i drive it. we tested the alternator on a tester the reading was 14.5 but when installed in the vehicle the gauge does not rises to 14.5v, I need help this is extremely frustrating because i just bought the truck, and the etc light is also on.

Have two batteries and crossover cable???
There was BAD electrical connection from alternator output to passenger side battery then crossover cable then driver side battery or BAD grounds.

 

[der24]

Thank you i will try these today!!

 

[B.G. Smith]

Also could be the fusible link where the alternator wire goes into the pdc or tipm or what ever it is called on that model. If you have a volt meter, check for voltage on the big wire at the rear of the alternator, it should be hot at all times. bg

 

[der24]

I should be getting a brand new alternator from the dealer and new batteries tomorrow these are all advice from the dealer.

 

[der24]

after installing the alternator the problem still occur, so i had a really good electrician check everything for me and he came to a conclusion that it was the regulator in the vehicles computer that was acting up, so he installed a new external regular and now the truck is charging just fine, thanks for all the help.