theres a plastic plug on the front of the gear box that is used to top up and check level, if u unskrew it and can see oil running out or can feel oil through the hole then its at the right level ( make sure the car is on level ground) it should be a red colour or a green brown colour, if its black then it needs draining and replacing and could also indicate problems with the box, however as for ur electric fualts, check all the earth lines and for any wires or wireing harneses rubbing and catching on anything... it sounds worth getting checked out tho