Join Date: Apr 2010
Location: Wayne, PA
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Re: Universal diesel wont start when engine is hot!
My guess is its the wiring harness connector in the engine bay - if you follow the wires from the engine to the panel and find a big wrap of tape around a lump unwrap it and check the connectors. Might be corroded, possibly melted. If the engine cranks okay when first starting the solenoid and starter are working. When cold possibly the harness has a usable connection but once hot it expands enough to create resistance in the circuit.
It might be the battery connection but you mentioned you cleaned all the wire connections - maybe you missed the harness connector hidden under the ball of black tape.
Search "mainesail M3-20B universal wire harness" (Mainesail has a ton of information online at marinehowto.com). Also lots of information available online from the Catalina 34 owners group.
Last edited by Dfok; 04-22-2019 at 05:59 PM.