which alternator. this is curious

[dayo808]

I have an 09 eb 4.0. Everywhere I call tells me that my truck is supposed to have a 120 amp alt. Everything I can see says I have a 105. The part # from ford parts was close to the part # on my alt but when I read back the similar number from my alt to the parts man I was told that it was an engineering number....... So I guess I'm asking for what y'all have in your trucks?

 

[Flag Gibby]

Mine is 115A. It looks like the remanufactured can be 115A while the new motorcraft replacements are 120A. Is it possible that the alternator was replaced and a NAPA remanufactured 105A put in its place (this is the only place that I see that a 105A is listed as a standard replacement for the 4.0L)?