Created: Apr 13, 2018
Electrical circuit diagram from: The Vega Handbook
Due to the photocopy being of low quality some names may be incorrect
The 12 volt electrical system circuit diagram is shown below. The battery capacity is 43 ampere hours. Some electric wires are led through conduits in the deck, see fig. 4. Fan, lamps etc, have 8 amps fuses, 25 mm (1") long (Bosch NSG ¾ Z). Festoon bulbs in navigation lights, and reading lights are 12 volt, 10 watts, 44 mm (1 3/4") long (OSRAM 6411). Cabin roof lights have 12 volt, 15 watts bulbs with bayonet base BA 15d (OSRAM 7430).
10 watts bulbs use about 0.83 amp. and 15 watts bulbs about 1.25 amps. When sailing in darkness 3 running lights and one light inside may be used continuously: 3 x 0.83 + 1.25 = 3.75 amps. A 43 ampere hours battery would be discharged in 11 hours. Two batteries or connecting a spare battery would double this time.
If any lamp, fan, etc should not function when turned on, check the fuse. If the fuse is good it is either the lamp (fan) that is out of action or a bad connection. Should the fuse be blown fit a replacement. If this should blow there is a short circuit in the wiring or the fixture.
The engine requires electric current for ignition, even when started by hand. However if the battery is discharged there is usually enough power left for hand starting. Should this fail, it is possible to connect dry batteries or a suitable transistor radio battery for hand starting.