Reading up on all this, Type 2 and 3 went to 12 volt for 67, beetles remained 6 volt as standard through 1967 but 12volt was offered as an option. It would also seem that the flywheel changed regardless of the voltage.
From Progressive refinements:
1 Aug. 66
Chassis number 117 000 001 (first 1500 was 117 000 003)
Flywheel Now: 130 teeth (outside dia. increased, starter and transmission case altered). Formerly: 109 teeth
1 Aug. 66
Chassis number 117 000 001
Electrical system Now: 12 volt Formerly: 6 volt (M610,611 M code option)
(Types 2 and 3 all went to 12v on 1. Aug 66 )
1 Aug. 67
Chassis number 118 000 002
Electrical system Now: 12 volt Formerly: 6 volt
1 Aug. 66
Chassis number 117 000 003 (1/1500)
Front wheels Now: Disc brakes Formerly: Drum brakes
14 Dec. 66
Chassis number 117 000 001 (only for certain export countries)
Brake system Now: Dual circuit system
Edited by user
18 years ago
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Reason: Not specified