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Lund Wiring Help

  • Brenden Marto
    Participant
    Posts: 2
    #2145110

    So I own a 2004 Lund Fisherman 1700 and it’s starting to show its age, nevertheless a good boat but it’s giving me some problems recently.

    I just bought a brand new battery for the trolling motor. The last one lasted about a year and after being on the charger for over 24 hours last week I got 20 minutes out of it on a perfectly calm day before it died (it’s a 12v minn kota power drive). There’s always been this cable running from the back of the boat to the trolling motor and I’ve always hooked it up. Me and my dad could never figure out what it went to and I wondering if whatever it is is the reason for such a short time of use.

    Does anyone with this model or similar have the same thing? The previous owner did some of his own work in here so I’m not sure what’s factory and what isn’t.

    Chuck Melcher
    Participant
    SE Wisconsin, Racine County
    Posts: 1890
    #2145179

    I have a boat something like yours…. Only my on board charger and the trolling motor are wired to the trolling motor only battery. I have a 24 volt system but it shouldn’t change a thing.

    KPE
    Participant
    River Falls, WI
    Posts: 940
    #2146362

    Can you send a pic of the mystery cable and how it connects to the TM?

    bigcrappie
    Participant
    Blaine
    Posts: 3054
    #2146444

    Might have used the TM battery to run something in the back of the boat.

    bzzsaw
    Participant
    Hudson, Wi
    Posts: 3156
    #2146545

    Wonder if it was used to pull power from your starting battery in addition to your wire going to your trolling motor battery? Did the mystery wire going from TM to back of boat go near your starting battery?

    Brenden Marto
    Participant
    Posts: 2
    #2146580

    I have no idea where the cable goes to. It runs off the TM battery to somewhere else in the boat but doesn’t lead to where the battery is in the back.

    Huntindave
    Participant
    Shell Rock Iowa
    Posts: 2549
    #2146583

    Me and my dad could never figure out what it went to and I wondering if whatever it is is the reason for such a short time of use.

    I have no idea where the cable goes to. It runs off the TM battery to somewhere else in the boat but doesn’t lead to where the battery is in the back.

    If it were my boat, I do whatever it takes to trace that cable and find out.

    eyekatcher
    Participant
    Lakeville, MN
    Posts: 790
    #2146586

    Is it one cable/wire or two?
    What colors and gauge.
    Pictures might help too.

    TheFamousGrouse
    Participant
    St. Paul, MN
    Posts: 9529
    #2146589

    Let’s apply a little basic troubleshooting here.

    !. Disconnect the Magical Mystery Cable.
    2. Try everything electrical in the boat to see what isn’t working. If you find accessories, lights, depth finder, etc doesn’t work, hook up the Magical Mystery Wire again to verify that’s what was powering it.

    Next if you don’t find anything that the Magical Mystery Cable appears to power, things get a little more advanced. We need to see if you have some kind of dead short that is slowly draining your battery.

    Generally, I’ve seen a lot of add-on wires on the TM battery because people are afraid of running the starting battery dead with constant use of the depth finder, GPS, etc. Also, the load placed on the starter battery when starting the engine wigs out some sonar units, so FWiW that’s a common one I see added on to the TM battery.

    Another one I’ve seen is owners putting on a 2 wire harness that runs to a plug somewhere tucked away on the boat. Then they have a battery charger/maintainer with the matching plug so they can easily connect a battery charger without messing with alligator clamps, opening hatch covers, etc. Obviously, there would be wires to the + and – terminal for this to be the case.

    Grouse

    Tucker02
    Participant
    FBL, MN.
    Posts: 87
    #2146590

    It may go back to a plug-in for a transom mount trolling motor but there should be two wires. Worth checking…..

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