Electrical Question
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Electrical Question

  1. #1
    79 Sanger Picklefork Tittyman's Avatar
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    Default Electrical Question

    Took the boat out today and it started a little hard. Ran around for awhile and then floated for about 2 hours. Barely started, got over the ramp and it stopped running, got it started, barely, ran for a couple seconds then stop. Volt meter in boat said 12 volts. Got home and put hand held volt meter on the battery and it said 12.47 volts. Tried to start it, electric fuel pump ran for a couple seconds then stopped. Turned the key off they on fuel pump ran started the boat, barely started. Put the battery on the charger, needle went to 8 amps, back to 0 then 8 amps back to 0. After about 15 minutes of back and forth it now is taking a steady charge...Bad alternator or what? Thanks guys..
    "Bill, if your gonna ride my ass that hard, at least you could pull my hair"....Hillary Clinton

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    What the Hell is That? 72Hondo's Avatar
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    Battery could be dying. What is the voltage under load? It may say 12 volts with no load but drop to 10 or so under load.
    Quote Originally Posted by Kyle View Post
    Log off and go float, hang in the party coves, Show and shine on the trailer, fill up the boat, wax it, v-drive, jet, outdrive, and if you got a canoe and your reading this, you sir, need to phucking upgrade.

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    79 Sanger Picklefork Tittyman's Avatar
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    Quote Originally Posted by Btnhtillidie View Post
    Battery could be dying. What is the voltage under load? It may say 12 volts with no load but drop to 10 or so under load.
    Battery was new last year 950 cca..I just went out and unplugged the charger put a amp. hour meter on it and it said 2 amps..battery is still charging but it sounds like the battery is toast? I think a new battery or fully charged battery should be at least 11 amps..Change thing is the battery is taking a charge.
    "Bill, if your gonna ride my ass that hard, at least you could pull my hair"....Hillary Clinton

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    Quote Originally Posted by Btnhtillidie View Post
    ... What is the voltage under load? It may say 12 volts with no load but drop to 10 or so under load.
    X2, put your meter on the battery while you're trying to start the engine.

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    79 Sanger Picklefork Tittyman's Avatar
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    Default Thanks

    Thanks for all the info..I know it was kind of a lame question but I just wanted to double check because I have to pull the rear seat out to take out the battery..
    "Bill, if your gonna ride my ass that hard, at least you could pull my hair"....Hillary Clinton

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    Senior Member Mojave85's Avatar
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    Your voltage should read around 13.5 to over 14 volts on your gauge if the alternator is charging correctly when the motor is running. If it is on 12 volts you are running strictly on the battery (until it goes dead).

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    Senior Member YumaJet's Avatar
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    Before buying a new battery, buy a load tester ($15-20 bucks at HF) and see if it is the battery. If the load tester shows above 12 volts, then it could be your alternator, during driving. If your alternator has been bad, it killed your battery cells. Start fresh and buy an alternator and battery.
    boatless....

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    "Try it Now!" Tahiti Boss21's Avatar
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    i just had a batt that would run the stereo, lites, etc..but no crank..Then load tested it...was JUNK
    1992 Eliminator Daytona 21'

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    A starter turning a engine over with a volt meter on the battery is a excelant load tester.

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    Senior Member ap67et10's Avatar
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    in another post you mentioned always having slow cranking. and the fact that you have to remove the rear seat tells me you have long (and probably old) pos, and neg cables. sounds to be me like you may have a voltage drop issue in the pos, and/or neg cables. also check the power wire from the alt. basically when they start building up resistance they end up becoming a load and using up the power instead of it fully reaching your battery or fully reaching the starter or coil or radio or ignition switch....you name it. voltage drop causes all kinds of problems in the jags i work on.

    something to check at least

    AP

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    Quote Originally Posted by ap67et10 View Post
    ... all kinds of problems in the jags i work on.

    ....

    AP
    Damn I hated working on those electrical pieces of crap. Lucas wiring - yuk.

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    Senior Member lbhsbz's Avatar
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    Don't go buy a load tester...you already have one. Its called a starter. Keep reading.

    12.47 volts is acceptable for a battery that has sat idle for more than an hour or so. Put your Voltmeter across the battery...battery, not the cables but the actual battery terminals while cranking. If the volts drop below 9 or so, then the battery is toast. If they don't...leave your ground test lead on the battery and move down the cable towards the starter. Once you get on the other side of the bad connection, you'll see the voltage drop substantially.

    To test for a bad connection, put the negative lead of your Voltmeter on the starter + post and the postive lead of your connector on the the battery positive post....if you see more than .02 or so volts, then something's up with the cable. Try the same test while someone cranks it (voltage drop tests are more accurate while testing under load).

    If your battery is holding 12.47 after you get home...its probably in decent shape, but measuring the voltage drop of the battery while cranking is the best test. If the battery voltage stays over 9 volts while trying to crank and the problem exists, then its connection or cable problems.

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    Senior Member sandeggo's Avatar
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    not to side track too much, but would a battery getting wet cause this as well?

  16. #14
    79 Sanger Picklefork Tittyman's Avatar
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    Default How to Check Your Alternator

    What is the procedure to check to make sure your alternator is charging? I have one of those cheap HF digital meters with the dial on it. Do you check from the battery terminals or directly on the alternator..and what settings do I set the dial at...volts, amps or what? What numbers should I see if it is charging correctly?
    "Bill, if your gonna ride my ass that hard, at least you could pull my hair"....Hillary Clinton

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