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If the alternator voltage output is fluctuating with the RPMs sounds like bad diodes in the alternator. I just replaced mine this week because of the same thing. One easy way to tell is, if you sit at a red light or stop sign at night with your headlights on, do they dim when you come to a stop and then get brighter when you give it throttle? If so, the the alternator has one or more bad diodes.
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1989 F-250 4X4 C-6 7.3 IDI, 4.10 SRW, Cobra 148GTL, 4ft bed mounted whips, 12" Powerbass sub, 600W Powerbass amp, Sony Headunit, GPC override(thanks M.L.S.C), Factory Ford aluminum rims from OBS PSD, 4" exhaust, no soupbowl, B&M shift kit
1997 F-350 4X4 E4OD 7.3 Powerstroke, 3.55 SRW. 3"DP to 4" exhaust, TS performance 6pos. chip, Quadzilla Recon XGT, DIY Tymar style intake, Atwood fiberglass cap
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