Boats For Sale:
1990 Sport Nautique/No Crank |
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morris2125 
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Joined: August-12-2021 Location: Iowa Status: Offline Points: 29 |
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 Topic: 1990 Sport Nautique/No CrankPosted: July-24-2024 at 6:26pm |
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Was going to head for the lake tomorrow with 1990 Sport Nautique 351Ford.
Started right up a few time in the garage then no crank, started kicking out the main ignition switch on the dash right under the blower switch on the right side of dash. Main breaker on back of engine does not appear tripped. After a few minutes can repush ignition on dash then power to instruments come back, still no crank. oil pressure gauge pegs out when you turn on key, once again no crank. It's always something! Any ideas? Thanks
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11104 |
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Posted: July-25-2024 at 6:01am |
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Here's the TRB wiring diagram which would work for your boat. It should help you troubleshoot. Since when you turn the key, the 20 amp breaker trips at least you know that the problem is being isolated by that breaker and there's no need for the main breaker to trip. You have a direct short to ground somewhere causing the trip. I'd probably start by disconnecting the power wire to the oil pressure gauge since you say it pegs when the key is turned, and try starting the engine. If that doesn't do it, one question would be .....does the breaker trip if you just take the key to Run without going to Start? If the answer is YES, I'd look at the electric choke to see if the 2 wires connecting to the choke are shorted together, or just unplug the positive wire at the choke and go to Run again. If the breaker still trips, disconnect the positive coil wire and try again. If the breaker still trips, look at the excitation wire to your alternator and disconnect it and try again. If the answer is NO, and it trips when you continue on to the Start position I'd look at the start solenoid on the back of the engine as a possible culprit. I suppose it could be the breaker going bad, but I'd check the stuff above first before deciding that.  
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morris2125
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Joined: August-12-2021 Location: Iowa Status: Offline Points: 29 |
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Posted: July-26-2024 at 1:16pm |
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Thank you so much, that is great info.
I am at the lake with my 82 Ski Nautique, all it needs is the front tranny seal. Can't wait to pull the tranny on that boat! It's always something. When I get home, I will go at the 1990 Nautique with a list of things to check. I did trip the starting solenoid and the starer does work. I have a dead short somewhere. Thanks again. Matt
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morris2125
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Joined: August-12-2021 Location: Iowa Status: Offline Points: 29 |
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Posted: July-31-2024 at 10:06pm |
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Just a follow up. After trying all the above mentioned I was still at a loss.
A few weeks back I had put a new tach in. At that time, I did not attach the holding bracket on the backside. A few days back I put the holding bracket on, and the troubles started. The bracket must have somehow moved a bit to create a short. Removed bracket and problem resolved! Thanks again.
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11104 |
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Posted: August-01-2024 at 6:50am |
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Well at least you used some good troubleshooting techniques like asking yourself "what did I do to the boat just before it started having it's problem and could that have caused the problem?"
Sounds like a job well done If the tach is loose in it's mounting hole, wrap a little electrical tape wrapped around the housing till it's a snug fit going in. Kinda "backyard hackish" but it'll work till you figure out a bracket solution. The tape should be good for at least 10 years
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