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Surface contact heating is not very efficient, but better than nothing.
Also if you have a 95 or 85 amp alternator, note that you are not going to get any were near that amperage at idle or normal driving speed. At normal engine speeds the alternator is only going to make any where from 15 to 30 amps at most.
The only way to get more power out of the alternator during low speed operation is, 1 put on a larger alternator, 2 over drive the one you have even more then it already is, 3 get an aftermarket one with its internals redesigned to pump out more amps at lower 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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