Consensus seems to be that it can work, especially on hard fouling, but that it doesn't deter all types of fouling; Don't know your instruments but, if they have an output for external alarm, it's easy to wire up a latching relay with loud piezo sounder. Our 90db sounder on anchor alarm would. I’ve just acquired a 30 year old suzuki dt4 outboard which has not been used at all in the last 15 years and was lightly used before that. It starts on the choke first pull, almost. In australia i would get the rectifier from jaycar, look up the part and you will be able to get something similar from a local company. The bridge rectifier is jaycar part number. After frustrating experience with a variety of antifouling paints over a 10 years period i finally bit the bullet and installed an ultrasonic antifouling device last year. A vital point is the correct identification of the components, and the jaycar instructions do provide a component list with some identification guidance. Some jaycar ultrasonic antifouling kits blow the power fuse.

Here is the reason why: The circuit has two schotky diodes d1 & d2 from the fet gates to the +5volt rail to. I fitted my jaycar unit approx 65 cms from the centreline just to the side of the engine and saildrive where the the hull was thinner and would transfer the sound vibrations. We just had our first haul out after using the jaycar system for a full year (it's combined with ten year old coppercoat). Very pleased with the result. I bought the jaycar antifouling system after reading the reviews on this site. Did the mounting right (i thought so) but everytime i switch the unit on i blow a fuse.

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