Alternator issue ?

[Dubstep Shep]

Use the 3 phase oem ford denso alternator from the 2010. The 05-09 cars used a pos single phase alternator. http://www.s197forum.com/forum/showthread.php?p=2079286#post2079286

Have you not been reading this thread?

 

[rebus]

The 6G gets constantly maligned, yet it's not really a POS alternator. Part of the problem is the fact that it has an internal regulator placement that is more prone to heat. Then ford chose to mount it tucked into the engine valley where heat is even higher with limited airflow. Same thing with the rectifier bridge, the diodes could have a higher rating, but the heat is the big factor. There are better alternators certainly, like the Denso, but the 6g is fine for most applications. The Mitsubishi is also single phase, but allows for higher current. If you look at the cooling of the Mitsubishi case you'll see it has pretty good cooling, along with a more robust regulator design and placement. The 6G is used in many thousands of HD fleet vehicles with decent reliability under punishing conditions, if it was that bad why would Ford continue to use it for so many years?

 

[Dubstep Shep]

For the same reason ford kept putting out vehicles that had spark plugs permanently stuck in the heads lol.

As far as alternators go, the 6G is as bad as they come. I've seen the warranty numbers. It's warranty rate is ridiculous compared to the 3G or 4G.