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Most of the load the alternator produces even at no load is fan windage and just powering up the armature to energize the stator to even just 12v puts a surprising amount of load on the engine. You have to kill power to the armature to completely electricity unload the alt. Then you still have the windage, it spins 3x crank speed.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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