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    Adding dash voltage gauge for trolling motor batteries.

    You can use a single gauge, plus a double throw, single pole switch to connect the batteries to the gauge, individually. I never thought that voltage was an indicator of battery charge. Batteries tend to show 12V+ right up to the point that they are near discharge.
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    Seat. Fixing hardware

    That hardware should have been stainless. That is the issue, not the rivets. You can drill them out and replace with stainless bolts and nylon locknuts. That should work for a while longer.
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    Fuel Tank Cleaning

    There are lots of standard fuel tanks on the web. Measure the size of the cavity in the hull and see if you can find one that is pretty close to the original size. Then look for a sale price on it. If that fails, you can always get a custom one fabricated for lots more $$.
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    98 sea ray 185, 4.3 bravo 1 steering problem

    Is this while you are driving or in neutral? If while driving only, look at the position of the zinc anode, if you have one. If no anode, look for something that would force the outdrive to turn, when underway, due to water pressure.
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    No spark

    That is precisely why I recommended he consult a wiring diagram. He should know how the ignition power and killer circuits work.
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    No spark

    You might check the wiring diagram to see if your motor is supposed to supply +12VDC to the power pack when cranking. I know my '98 60* 150HPV6 does. This gives the motor spark at slow cranking RPM.
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    Fuel Tank Cleaning

    As you suspect, aluminum tanks to develop pinhole leaks. You should pressure test it to make sure it doesn't leak, before doing anything with it. Put a couple of PSI into it and spray it with soapy water to check for leaks. I do not know of a way to fix it if it has leaks. I used marine-tex...
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    Cooling water output J150EXECD

    Water does not exit those vents. The center hole is threaded to accept a garden hose for flushing. It is plugged with a solid plug, with a telltale hole drilled in it, when not flushing the motor. There is also a flush plug that accepts a quick connect garden hose fitting. This flush plug...
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    High idle

    I am not intimately familiar with your model, but I think idle timing will control idle speed.
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    Anti Fouling Paint.-

    Single season, non-ablative antifouling paint has a limit on how long it can remain on the boat, out of the water and still have effectiveness. These kinds of paints have been around for decades. Their label will tell you of the launch requirement. Ablative antifouling paint, both...
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    High idle

    The linkage can stick open. Make sure to push it closed.
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    Plugs plugs and wires

    Those engines were very common for boats of that era. You probably cannot get one now, as inline 6s seem to have faded away, in favor of V6 motors.
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    Plugs plugs and wires

    Technically 250 Cu in does convert to 4.0L, However, make sure you get parts for the inline 6 that you have, for the year you have. Ignition systems changed greatly over the years, so you need the correct year and engine. I would expect it to be known by the original designation i.e. 250 cu...
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    '93 controls

    Look for a slot on the base of the handle. To remove the handle on a lot of those shifters, you need to turn them until you expose a set screw, visible thru the slot on the base of the handle. My OMC handle needs to be full reverse to expose the set screw. Other controls have a pop out...
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    Plugs plugs and wires

    Generally Mercruisers use their own ignition systems in their marinized auto engines. However, in that old of a motor, anything is possible. There are lots of web stores where you can look up and buy the correct parts. It is likely that iBoats is one of them. ebasicpower is another...
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    Hull support trestle

    Take a ride to any marina that stores boats on land. You will see stands like you have used, as well as cement blocks. Notice where they place the blocks on multiple types and sizes of boats. I cannot comment on stands as I have never used them. Never support the boat on a jack, and crawl...
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    Hull support trestle

    Gee, easy stuff. lower tongue of trailer as much as possible. Put stacks of cement blocks under each transom corner. Top them with wood so that they touch hull. You want at least 12"X4" wood contact area with hull, including right under transom. use double blocks on first and second course...
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    New to wiring - question about boat controls

    Generally, on an outboard, engine wiring runs directly from engine to controls. Power and tach signal are provided (usually purple wire and grey wire respectively), to dashboard for gauges only. The battery cable from the motor is connected to the battery switches, and then to the batteries...
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    1984 Mercury V-6 150HP Poppet Valve

    I believe the poppit valve, when open at 2000RPM or so, dumps water into the engine to cool it. The thermostats are therefore bypassed when the poppit opens. I do know that the poppit valve design has changed over the years. You might get original parts for yours to assure it works correctly.
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    Hull support trestle

    What kind, length of boat? Normally boats are blocked up at the transom corners, and under the bow keel. Cement blocks with wood on their tops works real well.
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