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I changed out my stock alternator for a new high output 160 amp unit, and I notice the same thing you describe on cold starts since then. Noisy for the first 30-60 seconds, while my Edge CTS shows 12.2 volts, and then quiet and smooth when alternator charging kicks in and voltage rises up to 13.9 volts.
2006 F250 ext cab, short box, 4x4 auto
ARP studs, BPD EGR cooler, Ford oil cooler, HPOP and turbo line updates (by Bernhausen @ 219K Kms)
BPD billet water pump, AFE CAC pipe
Eng. strategy VXCF9H7; TW Extreme tune
4" SS Magnaflow turbo back w/ muff & hi flow cat.
Edge CTS monitor w/ EGT
CAT EC-1 coolant w/ bypass filter
stock air intake w/ shielded Zoodad
3.73 axles, 275/70R18 BFG A/Ts
To do: injectors, Snow Stage 2 water injection, blue spring, fuel press sensor
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Last edited by freecanadian; 02-03-2014 at 06:18 AM.