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Last Thursday I decided to try my cooling on a hot day 32C (90F); orbiting the airport, the cooling wasn't too bad but while waiting for the temps to stabilize I smelled smoke so landed immediately. Saw a bit of smoke exiting the oil cooler plenum so thought I was baking some fiberglass.
On the weekend I did a more thorough inspection and found the battery mains cable burned where attached to my alternator cut-out relay and the relay fried to the point that the input terminal was loose. The connections stayed in place but open-circuited the relay - so the engine never skipped a beat and I was unaware there was an electrical problem at the time. Only reporting this now as it took me a while to get the alternator tested.
Jeff
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