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    Engine runs perfectly for 30 minutes + then dies with no dash power

    Would add along with every +/- connection at battery/engine/harness to focus on the main engine harness ground connection at the flywheel cover. Should be stacked directly with the battery ground Seen a few issues similar to yours where the harness ground wasn't touching a battery ground lead...
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    2000 Volvo Penta 5.7 Gfi with no spark

    You can bypass the breaker with a bolt and nut joining the leads for testing purposes. Just be sure to cover the connection with tape Based on info and pics provided by you I'd say it's a big part of your problem but possibly not the only issue
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    1976 888 Fuel Questions

    Yeah, that's too little water to be present at the exhaust, should see at least some at the idle relief ports as long as there's no blockage prior. The muffs are allowing a lot of water to flow past the sealing area. Make sure the water intake area the muffs seal around is clear of debris. The...
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    Top gimbal bearing o-ring on drive shaft sheered off?

    If its the o ring closest to the u joints thats one of the two gimbal bearing o rings used as dampeners between the gimbal bearing race and splined input shaft Shearing it off isn't too big a deal but it could indicate a misaligned gimbal bearing or too large o.d. of the o rings Light grease...
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    Cause of alpha 1 steering freeplay discovered...(video uploaded)

    I see the video link now and have watched it That is not a lot of slop, especially with the engine not running/power steering actuator disengaged. There is a bit of free play in the design of the system to allow for free movement/less risk of binding during operation and yours looks normal...
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    Cause of alpha 1 steering freeplay discovered...(video uploaded)

    The two pins pictured post #5 are not brass unless they've been replaced. Oem is steel and I've never seen one worn to the the point of creating noticeable steering slop Most often the issue is a worn gimbal ring, steering shaft, tiller arm, or all three. Second most often cause is a worn...
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    MerCruiser 3.0 Runs Poorly As It Warms Up

    The items suggested for inspection are "the simple stuff" I'm not saying a 3.0L can't have a warped head, anything is possible within reason. Just saying it's rare and based on OP's mentioned symptoms compression would not be close on any apt mechanic's initial troubleshooting radar
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    Lowrance Transducer Cracked

    Expect to be buying a new transducer but I second this
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    MerCruiser 3.0 Runs Poorly As It Warms Up

    Would think if compression is an issue OP would experience the symptoms immediately upon staring the engine, not something that gets progressively worse with run time Never have seen a warped head on a GM 3.0/2.5. Along with suggestions in posts #2 and #3 you should check the filter in the...
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    1981 120 Mercruiser idles rough when hot

    Coil getting hot could be a failing sensor assy, especially seeing the erratic timing jump when the engine runs poorly I've had similar experiences others have posted about with pertronix. They work for a while, then they don't. Avg. failures I've seen is about five seasons
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    My turn with a old boat that has a sudden loss of ALL battery power in a 45 year old boat.

    Heat shrink tubing is the best addition to battery cable ends. Manufacturing your own is easy, just need a suitable crimper for the lugs/ends.
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    1971 3.0 Liter Carb Question..

    Check/set idle timing prior to adjusting the idle speed and air mixture. Once that's all dialed in you can check it again in the water under load at idle speeds Full rpm range lake test only after the idle issues are resolved
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    De-winterizing Mercruiser 5.0 mpi with heat exchange

    I think you are referring to fresh water, e.g.what comes out of the faucets in galley/head as raw water Raw water is water that is pumped on-board using the surrounding water (lake, river, ocean, etc) the boat is floating in. Engines use raw water for the cooling systems and some pumps are used...
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    15hp mercury efi rough idle

    Sounds like not all cylinders are firing/operating correctly
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    Alpha Gen 2 Trim Switch Retainer on a Gen 1

    Yes Or, you can reinstall the original without the top bolt. Works fine this way
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    1981 120 Mercruiser idles rough when hot

    Most aftermarket electronic ignition upgrade components work quite well out of the box however I've seen a few fail within a week or two of install. I've seen some behave exactly as you describe, work great first 20-30 mins but when fully warm/up to temp they start to fail. Would be high on my...
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    Boat taking on water !!!

    At first glance I'd say the garboard drain is the opening in the far left of the picture posted #1. But all I'm looking at is a photo outside the hull Agree with others here about live well intake/drain fittings/hoses, notorious for leaks and in some cases near impossible to easily reach for...
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    2000 Volvo Penta 5.7 Gfi with no spark

    Might just be shadows/tape residue but a couple wires looked corrupted Focus on gaining 12v (+) and ground throughout the harness. Start at the battery and work your way along +/- circuits
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    2000 Volvo Penta 5.7 Gfi with no spark

    I think dodge was asking to see the diagnostic cables but I'm wondering how much of the engine wiring harness has had the tape removed and for how long The pics show at least one burnt wire and one clipped wire. There's some harness connections disabled throughout the gallery as well. Granted...
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    De-winterizing Mercruiser 5.0 mpi with heat exchange

    Can't tell from the pictures posted #1 if the water heater is plumbed for a "preheater" or heater core for engine coolant to heat the freshwater in the water heater tank If the water heater is plumbed so as described above hopefully the winterize included a flush of that accessory portion of...
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