Should I be concerned that my alternator reads at a 12.9 amps, or is it a coincidence i needed to replace 2 batteries in 1 month.(one on warranty) and, is it easy to change the alternator(any pics?)
thanks

 

Are you Talking about 12.9 Volts on a meter?

It should be more like 13.5

Test in the power cable before the Battery cable and see what it shows there.

 

I am not sure how they did it. I took it to Advance Auto. They put in a new battery, and did their alternator check, with me revving at 2000 rpms. It came back at 12.7 and 12.9. They said it should be at 13 or above. Is this something i should be concerned about? Anything else that i should look for?

 

I would be.

Do you have a Volt meter?

 

Ok, i took it to volvo and they said it is the alternator. does anyone know if i need a 100 amp or a 120 amp. it is a 93 volvo 850 2.4 . any thoughts?

 

I think it is the 120 amp. It might say on the back of the ALT.

Also try to check the terminal like I desribed above.