Join Date: Sep 2010
Location: Portland, OR
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Voltage drop at 2000 rpm
I've poked through the forum and haven't found an answer so here's my issue:
05 6.0 crew cab dually 4wd KR w/150k, EGR delete and studs
Coming home Tues eve, battery light went on while on the highway, flickered and went off. I switched my CTS to show batt volts and continued driving. FICM stayed around 48 but batt fluctuated from high 11's to mid-13's. Had the alt tested on the truck and it tested bad so I replaced it. Worked fine for Weds but now is doing the same thing.
Idle to just shy of 2k yields 13.1-13.4V, cross over some magic RPM and it drops to ~12.
This is irrelevant of AC, headlamps, radio, HVAC, etc... I've tried all of them on and off. I've checked wires off the alt and batt grounds and they seem ok.
Any ideas? Anyone???
Thanks in advance,