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Yeah you dont want to unhook the battery with the engine (and alternator) turning.
I have seen alternators put out over 20 volts when the battery was unhooked and with little to no load.
I had one alternator put out 48 volts at no load but it worked fine when installed into the electrical system.
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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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