Does anybody know how to check for the isolation of the engine and gearbox. I know you can do a continuity check but what sort of reading should there be? Zero or is there an allowance.
    I have aluminium prop corrosion problems. I even have a 240V isolator fitted to stop any marina current problems from other boats or pontoons. I am in contact with a Volvo agent who said they would check with Volvo as our boat was built about the same time. So far- silence!