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Well .. i have the cover off .. unfortunately the only diagnostic I can do is to test the integrity of the windings. I can remove the choke, RFI filter, AVR and diode bridge. I guess I can test the diode bridge. The brushes and sliprings are at the other end and would require complete removal of the generator. A pain since the generator is only mounted at one end and relies on the coupling to the engine to hold the other end up.
After thinking I realised the 240v generator is entirely independent of the 12v system so there's no point uncoupling the 12v alternator.
AHA. It's an MD1C AVR inside the cover plate visible now after cleaning. I had exhaust problems and there is soot everywhere. It's even possible soot = carbon = conductor is the problem and a good clean will fix it Luckily i just bought a nozzle fitting for my scuba gear to create an air jet. Well let you know. Thanks again for all your help!
OK, its and SL105G, 7KVa. Needed a mirror to see the plate (the 'front' is backed onto a bulkhead). There is no visible external AVR, choke, RF filter etc. Nothing. There is an on/off switch in a plastic box mounted on the side. From the diagram the AVR is inside the end cover plate which is easily accessible but I can't see anything inside there because it is so dirty. Will clean with compressed air next, then check the safety precautions for removing cover plate.
Thank you for your help. additional information that you need are below.
20 ft maximum torque lb/2000rpm
Maximum speed: 2500 rpm
maximum power: 10HP/2500rpm
gearbox ratio: 2:1
waterline length of 18 ft.
plates welded aluminum hull material
direction of propeller rotation: Right
Hull type not know but I can tell you that was originally lifeboat opendeck
without keel but the building has 2-inch flat bar along the entire length and two anti-rolling keels on each side
thanks again for help.
Thanks Doug ill let you know my farther has maybe found the right part, if its not ill give you a ring thanks for the info. I'm stuck in palau so if its not the right bit ill have all week to try and order the right one the problem is that the planes only fly once a week up here from the gold coast so i was in a hurry to have it on tonights flight.