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Newer cars have alternators that use pulse width modulation to control field power.
Only the coils only make about 15 volts from around 3000 to 12,000 rpm.
The only time you see anything like 40 to 55 volts is on permanent magnet setups like magnetos used on small engines.
The voltage regulators in old school generators and maybe some old fashioned external excited alternators may have put off a ton of heat but anything made after about the 1980s isn't like that.
My automotive alternator welder I made develops about 80 volts DC at no load with 12 volts going to the field while spinning the alternator at around 7,000rpm. So they can make a lot more then 55 volts.
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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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