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    Alpha 1 Gen2 Trim drops when under power

    Thanks. I just bought a new pump and will see if that solves it. If not, I'll rebuild the cylinders. That doesn't look too difficult.
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    Alpha 1 Gen2 Trim drops when under power

    '09 Merc 5.0L w/ Alpha 1 Gen2 - trim works fine up and down, but when I'm out on the water and trim the motor up it drops right back to the down position. Occasionally, it stays slightly above the bottom position but then often it will drop to the full down position? No luck researching this...
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    '09 Merc 5.0L Carb / Alpha 1 - Engine runs and will not respond to ignition or kill switch when at temperature?

    @ $30/ea, I'm starting with 1. Like most boat gremlins, it ran fine when I winterized it. Have a new temp sensor on the way and the TKS diode and will trace wires again once it stops raining.
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    '09 Merc 5.0L Carb / Alpha 1 - Engine runs and will not respond to ignition or kill switch when at temperature?

    thank you. I have this diagram and it is helpful. I just pulled the TKS diode and tested it with the multimeter. I'm confident it is shorted and is the problem.
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    '09 Merc 5.0L Carb / Alpha 1 - Engine runs and will not respond to ignition or kill switch when at temperature?

    Thank you. I ordered a new diode just in case. The only thing I noticed new was the alternator was putting out around 14amps (on the gauge). That's higher than normal.
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    '09 Merc 5.0L Carb / Alpha 1 - Engine runs and will not respond to ignition or kill switch when at temperature?

    Engine has never overheated. I appreciate the help. I will double check the wiring for shorts.
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    '09 Merc 5.0L Carb / Alpha 1 - Engine runs and will not respond to ignition or kill switch when at temperature?

    09 5.0L TKS (Chev) Starting the boat for the season. Engine starts and runs great, key switch and kill switch operate normal when engine is cool. Once the engine reaches operating temp it will not respond to key switch or kill switch; it keeps running. I found that if I disconnect the sensor...
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    '09 5.0 TKS (Carb) not running

    OK, boat is back from the shop. Here's the answers in case anyone else may run into this issue. 1 - Oil pressure sensor was bad and replaced; 2 - Temperature sensor switch was also bad and shorting out when engine reached 130F and shutting everything else down. Even being this simple it still...
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    '09 5.0 TKS (Carb) not running

    Didnt check before it went to the shop.
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    '09 5.0 TKS (Carb) not running

    Update: Boat is heading to the shop for the professionals to look at. Pulled it from the water last night and jumped the fuel pump direct to the battery (no other lines connected) to flush the motor if possible (salt water use). Able to start and run for ~5 minutes then died. Lost spark to...
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    '09 5.0 TKS (Carb) not running

    Thank you. I will check and confirm this evening.
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    '09 5.0 TKS (Carb) not running

    I will have to double check on that later this evening. I am thinking no but will confirm.
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    '09 5.0 TKS (Carb) not running

    Did that. P/Y disconnected from starter and jumped oil pressure sensor plug. Fuel pump ran but same result, jumper wire got really hot. Installed new fuel pump and got same result, so I have ruled out the fuel pump being bad.
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    '09 5.0 TKS (Carb) not running

    No power at the outside lug when key is on or cranking. I jumped the pressure switch and the boat ran BUT when I did this the jumper became really hot. Did this while I was waiting for the new pressure switch to arrive. Installed that yesterday.
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    '09 5.0 TKS (Carb) not running

    Fuses are good. And when I jump the fuel pump, it is direct to the pump so there is no back feed into the system. Only the battery and the pump plug. Thank you for the diagram. I had a thought on just replacing the P/Y wire as a test but I dont know what feeds it. Does it come from the...
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    '09 5.0 TKS (Carb) not running

    Trouble with my '09 5.0 TKS (Carb) #1A342087. Engine died on the way back to the slip and will not restart. If I jump the fuel pump straight to the battery, it will run. I believe my issue is in the Purple/Yellow circuit that feeds the fuel pump via the oil pressure sensor. I have also just...
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