The motor current on the High setting never went though the main Fusible Link. Only Medium and Low fan settings are powered through the main Fusible Link. The Fan relay allowed the higher alternator voltage available at the center terminal of the Isolator to power the fan to an even "Higher" high speed while also eliminating some voltage loss with shorter wiring to the power source. Your One-Wire alternator mod eliminated this higher voltage advantage, so those with one-wire alternators enjoy a quieter fan motor due to its slower speed.
Merry Christmas and Happy New Year to you ,Jim
The motor current on the High setting never went though the main Fusible Link. Only Medium and Low fan settings are powered through the main Fusible Link. The Fan relay allowed the higher alternator voltage available at the center terminal of the Isolator to power the fan to an even "Higher" high speed while also eliminating some voltage loss with shorter wiring to the power source.
Your One-Wire alternator mod eliminated this higher voltage advantage, so those with one-wire alternators enjoy a quieter fan motor due to its slower speed.