Frigoboat keel cooler grounding

affinite

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2 Feb 2005
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I recently installed a Frigoboat keel cooler. The installation instructions said to connect the grounding connector on the KC to battery -ve which I duly did.
The other anode on the hull, the engine, P bracket and rudder are NOT connected to battery -ve but simply interconnected
(The engine (Perkins Prima M60 is isolated from battery -ve)

Does this sound correct?
The reason I ask is that the anodes on the KC were depleted and there was some strange psychedelic patters on the prop when I hauled the boat out after only 4 weeks in the water
Thanks
 
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