Yamaha 50hp - trim motor problem

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Yamaha 50hp - trim motor problem

After a number of problems on my engine caused by water in the fuel I had to have all the carbs cleaned and reset and have fitted a big water filter in the fuel line hoping this was the end of my engine problems.
Now however I am having trouble rasing and lowering my engine, at first I thought it was a battery problem but there was no problem starting the engine, which takes far more power from the battery.
The relay for switching the tilt motor is clicking in but after a few lifts/lowers the motor just gives up the ghost, my engine mechanics can only check the motor out fully with the boat out of the water.
Has anyone had a similar problem and if so what was the cost of a new tilt motor?