Hello all,
I just recently had to swap my alternator due to mud failure (again), and the "new" (free replacement) one I put in seems to make a noisy bearing noise. On top of that, it seems to never want to output more than 13.7volts (14.0 is just about the highest I've ever seen it go). It will sometimes drop to 13.2 or 13.3. I am not sure if this is a lemon, or if my battery is old. The battery seems to hold a resting voltage just fine, and has about 535 CCA out of the original 725CCA.. maybe not the best measurement but the shop tested it this way and said I needed to replace it. I am skeptical of this.
My previous alternator was putting out 14.3 volts in normal conditions.
Just wondering if this alternator is a lemon or if the battery isn't accepting a higher voltage anymore. I have an OEM spare with low-ish miles on it and was thinking of swapping in my free time to see if maybe the noisy bearing sounds will go away. The truck just recently had all other pulleys replaced (new compressor, idler, fan bearing). Only other possibility is a noisy power steering pulley but the noise doesn't come from that side of the engine bay.
I just recently had to swap my alternator due to mud failure (again), and the "new" (free replacement) one I put in seems to make a noisy bearing noise. On top of that, it seems to never want to output more than 13.7volts (14.0 is just about the highest I've ever seen it go). It will sometimes drop to 13.2 or 13.3. I am not sure if this is a lemon, or if my battery is old. The battery seems to hold a resting voltage just fine, and has about 535 CCA out of the original 725CCA.. maybe not the best measurement but the shop tested it this way and said I needed to replace it. I am skeptical of this.
My previous alternator was putting out 14.3 volts in normal conditions.
Just wondering if this alternator is a lemon or if the battery isn't accepting a higher voltage anymore. I have an OEM spare with low-ish miles on it and was thinking of swapping in my free time to see if maybe the noisy bearing sounds will go away. The truck just recently had all other pulleys replaced (new compressor, idler, fan bearing). Only other possibility is a noisy power steering pulley but the noise doesn't come from that side of the engine bay.
Last edited: