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Thread: Yamaha Electrical Problem

  1. #1
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    Default Yamaha Electrical Problem

    I have a Yamaha 115/80 Jet that has developed an electrical issue. She was running smooth then for no given reason it started cutting in and out. When I stopped to investigate she quit running. When I tried the power tilt it too was inop. Tightened battery connections and everything operated as advertised. Yesterday it started then immediately quit. I tried to re start but there was not enough juice to engage starter. Checked the terminals and found the positive side hot, burnt the heck out of myself. Soooo does the engine need battery voltage once started in order to keep running. I assumed the motor had a magneto or that sort of thing once running. Before I start replacing parts maybe you can educate me.

    Thanks for all the input


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    There a lot of things that could be causing your problem. The positive terminals getting hot is not good, it may be because the connection is corroded if so clean and put dielectric grease on it. If the connector or cable is bad, replace it.

    If you will tell us what the battery voltage is with and with out a load it would help to narrow down the problem.

  3. #3
    Supporting Member Hoyt-Hunter's Avatar
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    If everything was running fine before, I would get the battery tested and check all connections.


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    Member DRIFTER_016's Avatar
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    Sounds like dirty connections @ the battery to me as well.
    Dig out the wire brush and disconnect cables clean er up good and and reconnect.

  5. #5

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    I had a Yamaha starting problem and a buddy came over, took off every single electrical connection, wire brushed it, sprayed T-9 on it and replaced it. The culprit was the ground. None of the connections looked corroded, I was amazed. Don't trust your eyeballs, just because it looks fine, doesn't mean it is
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    Thanks I'll be back to the cabin Aug 6 and will let you know how she is acting after I clean connections


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  7. #7
    Member Sobie2's Avatar
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    Replace your outboard's battery cables. I have been through this many times on a number of boats (including last week). They go bad faster than the rest of the wiring on a boat. Hot and smoking terminals, slow to crank, intermittent tilt trim, motor cutting out when you hit the tilt trim, and crazy acting chartplotter/depthfinders are all symptoms of possible bad battery cables.

    Sobie2

  8. #8
    Member Akgramps's Avatar
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    As stated, test battery, clean connections and replace wingnut/s on batt terminals with a SS locknut.
    “Nothing worth doing is easy”
    TR

  9. #9
    Moderator bkmail's Avatar
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    Quote Originally Posted by Sobie2 View Post
    Replace your outboard's battery cables. I have been through this many times on a number of boats (including last week). They go bad faster than the rest of the wiring on a boat. Hot and smoking terminals, slow to crank, intermittent tilt trim, motor cutting out when you hit the tilt trim, and crazy acting chartplotter/depthfinders are all symptoms of possible bad battery cables.

    Sobie2
    Agree completely! Customer's boat had issues cranking, 225 Yamaha. Replaced cables as they were heating up.
    Spins motor like a top and starts instantly.

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  10. #10
    Member Rob B's Avatar
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    I had the same problem a couple years ago. Polar wire made up new cables for fair price and my motors ran great ever since


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    That really sounds like the culprit. I'm going to have to fly out Sunday and measure the cables. Is polar wire in Anchorage?


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    Member akdeweyj's Avatar
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    Brayton Drive just north of Dimond. 561 5955

    Quote Originally Posted by cplne View Post
    That really sounds like the culprit. I'm going to have to fly out Sunday and measure the cables. Is polar wire in Anchorage?


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    If your going to replace the cables (power and ground) I suggest using one to two sizes larger. Most builders never use the proper size cables. Use S.S. nuts non-locking they have lower resistance than locking nuts. Dielectric grease on all connection and battery cable covers (red and black). This would be a good time to wire the battery system per ABYC to prevent future problems. Only if the boat was in town not at the cabin in case you got over your head. If the battery is still good but old replace it.

  15. #15
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    Hey guys I am having cables made up Tuesday. I'll let you know if I have further issues. Thank you for all the suggestions


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