Electrolysis !!!!!!!!!!

[The Dock]

Have issues with trim rams on outboard. Being told it is down to electrolysis as trim rams are sitting in oil and supported by rubber seals which means rams cannot be earthed. I have a large earth cable connected from negative on battery to transom bolt of outboard. Is this correct? All wiring is o.k. Should i switch off main power isolator switch when boat not in use? All anodes are o.k and signs of corrosion on all which i hope means all are working o.k. I desperately need help and advice no matter how trivial or easy it seems to be i will take all advice gladly and hopefully put this problem to bed! Cheers Guys!!

[BruceB]

One side of the ram must be firmly attached to the main part of the outboard, even with an insulating bush surely a wire can be taken from the mounting bolt to the rest of the engine?

[The Dock]

Appreciate reply but engine only in contact with rams when in transit, obviously when trimmed down.larger ram lifts engine out of water when not in use and I think this is when the problem arises.