Join Date: Feb 2007
Location: Spokane Valley
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I have a 2000 dual alternator 7.3 that is having voltage fluctuation issues. Bounces around from the normal ~14 volts to over 18 volts. I tried to isolate it by unplugging the plug on each alternator and the problem is there with both of them. It is totally random and not RPM dependent. I thought it might be the regulators, but these alternators were rebuilt within the last couple years and I find it suspect that both would go out at the same time. The batteries are new as well. Everything starts and operates as it should except the fact that the voltage spikes up (which can also be seen in the lights).
I'm wondering if it could be an issue with the sense wire signaling.
Maroon 2000 F-250 PSD XLT CrewCab/ShortBed/4x4/Auto