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Alternator/Charging Voltage Questions
So I have this '06 F250....what I'm noticing is that randomly my charging/battery voltage(as monitored by my Insight CTS) will drop to almost 12.5V. When it does this it stays that way (12.5-12.7v) until the truck sits for a while, usually overnight. For example, today after work (sat all day) I fired it up, waited for the glow plugs and saw my voltage go up to about 13.6v. Kick in high idle and it goes up to 13.8v-14.0v. Drive the 20 miles home, all looks OK, around 13.5v. Get home, shut it off, and it sits for maybe 15 minutes. Go back out to run some errands, and after my glow plugs shut off, my voltage shows 12.4v and barely breaks 12.8v once I start driving. Also when this acts up and I flip my high idle on, it starts ramping up almost immediately, to 1400 rpm or so. Normally it just sits at 1200.
So that's what's going on. I think my alternator is on its way out, but it doesn't seem to be hurting the batteries. I replaced them 3 weeks ago or so, and it still starts just like it did they day I put them in. No battery light either.
Any thoughts guys?
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ASE Certified Master Tech A1-A9
L1 Advanced Level Specialist
2006 F-250 SCSB 6.0 FX4 Lariat
285/70R17 Nitto Trail
Grapplers, Upfitters w/ High Idle, 4" Turbo Back Straight Pipe, AFE 6" Polished Tip, Insight CTS w/ EGT, Blue Spring, IPR Gen 2, CAT ELC, DieselSite Coolant Filter, Cloud Rider Cold Front