Dieselwrench
New member
What controls the alternator charging cycle? I've got an '05 that I can't tell if it's charging correctly. Right now I can only check the system with a multimeter while the truck is sitting still, but I don't think it's charging correctly. The most I've seen is 12.5 volts. This is with the headlights, interior lights, radio, and blower motor all turned on. Just for fun I replaced the alternator with a rebuilt one I had and hit the same results. I also had the local O'Reilly's check the alternator I took off and according to them it passed. I also checked the voltage on an '02 6.0 at work. The '02 showed 13 to 14 volts with the headlights and blower motor turned on. My '05 never has the battery light come on nor do I ever see the lights dim or have any indication that the charing system is not working. The batteries do sometimes require a trickle charger, but I think that's mostly due to lack of use. The truck is parked outside all the time here in Oklahoma and driven maybe two times weekly. Sorry for the long post and thank you for any and all information.
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