help mechanic says i need to change altenator

[Bobby V]

I asked my mechanic to do a load test on my batteries and cgheck my starter and alatenator, he said low volts on my batts and my alt failed, when I jumped into my truck my battery gage was at 13.4 volts, thisv morning when I started it was at 11.9 then went up to 13.6,. All day was in that range,
Was this guy trying to rip me off
05 ford f350 drw 6.0 litre edge evolution chip

[chuckster57]

Mechanic is trying to get you to pay for his Black Friday purchases. Take it somewhere else for a second opinion. Voltage in a 6.0 is sort of critical for the health of the FICM.

[Alaskapsdvan]

Your readings are some what my volt reading on the scangauge 2 was showing before I replaced it. Now that the alternator was replaced in the middle of summer the readings are above 13.8 and that is with all the lights on and heater going at full and setting at a stop sign....
I would say that yours is on the final legs and will need to be replaced.
I would shop around for some prices and what it would take for your self to replace the alternator and belt while you are at it, also check the pulleys.

[Bobby V]

Thanks for the replies, I'm looking for another good diesel mechanic just hard to find them in my area,

[Mark Kovalsky]

You don't need a diesel mechanic to diagnose an alternator.

[rock_doctor]

I am with Mark. Any mechanic can change an alternator. In fact, most here do it ourselves.

[bobsherrie]

The voltage might be okay but maybe the alternator isn't putting out enough amps. That would account for the low batteries. I agree with Alaskapsdvan that your alternator is about done. They seem to fail often according to posts I've seen.