I meant to do that when I got it installed but my multimeter was dead. I attached the wires exactly how they were on the 55 amp. Replaced the two small ones that are run together with a 4 ga one and the thin blue wire went to the only other terminal on the alternator.

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1981 300 SD 213k miles "Stock for now"
1999 Super Duty 7.3L 113k miles
1981 300 SD 180k miles "Heavily modified" SOLD