I know from my alternator welder, energizing the field with no output puts a pretty good load on my 5hp OHV briggs and Stratton engine.
The steel core laminates on this alternator are more like 1mm thick.
With my welding alternator making around 2.2kw it takes everything the 5hp motor can muster
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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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