Hello!
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Two questions in one:
1) I changed the plugs after 12000 km had passed with the old ones (Bosch W8AC to Bosch W8AC). The number 2 cylinder had a bit different color in the old plug. (order 1-2-3-4 in the pic below)
2) The wind screen wipers (-73 model standard beetle) have lost the "fast" option. Both on-positions in the switch move the vipers in "slow" speed. The wiring diagram does not reveal to me, how actually the speed is controlled. Should I aim at the viper switch in the steering column, wiring or the motor itself to find the problem? Any suggestions?