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Hello all and thank you for what...
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05-02-2021 05:56 AM
Hello all and thank you for what I have read and learned from your answers. We are new to boating and bought a 2006 340 Sundancer with Mercury 8.1’s. She’s very clean. Looking for advice on an intermittent no start / stall of our port side motor. I can not stress how well maintained the boat is. The prior owner replaced many items just to be ahead of things. Fuel pumps were replaced 2/3 years ago. Fuel solenoids were replaced too. (Will not bore you with the whole list of new parts) We replaced the fuel filter on the port side - thought that fixed the issue. Our mechanic tightened a slightly loose harness which when he moved - she stalled. Last night- no start - cranked (full fuel tank). We squeezed some hoses and 5-10 minutes she started and ran beautifully. Went out. 2/3 hours later about to head home- started. On way stalled. 10-15 minutes later started. Anything you think I can look for will be appreciated. I will do my best although when our mechanic has time- I will ask for his assistance. Unfortunately the intermittent issue does not make this easy. Picked he up end of last season and most time she started and ran beautifully.
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05-02-2021 08:44 AM
The boat will only go when it wants. Please learn who is in charge and get w/ the plan.
The issue is VERY easy to diagnose. There are two engines. Do the same checks on each to see what is good, what is bad.
Using a DC voltage meter, black wire connected to the engine block ground, measure DC voltages using the red lead.
The Red / Purple wire should have +12VDC when the engine is on. Measure on the rear of the circuit breaker. The Red lead from the circuit breaker to the starter should also have that same +12 VDC.
The small Yellow / Red lead to the starter slave solenoid, up high on the engine block should have +12 VDC when the starter switch is pressed.
The thick Yellow / Red lead on that same starter slave solenoid should also have the same voltages.
My 100% speculation guess is the starter slave solenoid has gone bad. My spare parts arsenal includes two of these, just in case.
Another 100% speculation is that the high current leads will all be MUCH happier if they are disassembled, inspected, cleaned, reassembled, properly tightened, then protected w/ liquid rubber. Please remember to disconnect every battery negative terminal before performing this service.
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05-02-2021 10:37 AM
