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Topic Review (Newest First)

  • 07-22-2010, 10:07 AM
    RvRrat
    Quote Originally Posted by Inquisitive Gearhead View Post
    A fully charged 12VDC battery will be at 13.6VDC.
    Its actually 12.6V or so open circuit (not on charge)
  • 07-22-2010, 09:55 AM
    Tittyman

    Thanks

    I guess I should just start by unplugging the plastic plug on the side leave the power cable attached to the back of the alt. and see if I have a voltage drop over the next couple of days and then take it from there...never would have thought it could be an alt. drawing voltage while it just sits there..thanks..like I always say..this is the place to come for advise on boats, sex, and money...Titty..
  • 07-22-2010, 09:54 AM
    Inquisitive Gearhead
    A fully charged 12VDC battery will be at 13.6VDC. Internal leakage in batteries is pretty common but it gets worse when a cell begins to go down.

    There is obviously a drain on your system, but I would suggest that you check each cell to see what its state is. It is always worthwhile to check the SG of each cell in an acid-lead battery for verification of charge condition.

    Also batteries sometimes have problems internally with not adapting well to vibration if the cell supports are corroded or broken so that there can be internal (albeit intermittent) shorting.

    Good Luck in chasing the problem down.

    Regards,
    IG
  • 07-22-2010, 09:42 AM
    RvRrat
    This is pretty typical. You can see what will happen if a diode goes bad.

  • 07-22-2010, 09:37 AM
    alkyexpress
    Quote Originally Posted by Tittyman View Post
    To do this test do I need to unplug the main wire off the back or just the plastic plug on the side..also if it turns out to be the problem with the voltage drain, when I replace the alt. should I get a single wire or replace with another alt. with the plug on the side and the power wire out the back..also could a bench test show that it charges but the diodes are bad..thanks..
    You could get a ONE wire voltage regulator for that alternator ( aprox $35 ) ..E
  • 07-22-2010, 09:32 AM
    alkyexpress
    Quote Originally Posted by Tittyman View Post
    I am running a stock alt..not sure about what a trigger wire is..I think the alt. is the old type with the plug, not a single wire.
    That is what I am talking about, the alternator has 3 wires , one to the battery (big wire ) then one from the little plug to the charge terminal(of the alternator ), then one to the ignition switch , (small wire on the little plug) if the small wire is to a positive source the alternator will be ( ON ) all the time ,, even if the motor is not running ,,
    some of the ELECTRICAL GURU'S will chime in and give a better explanation of the field and coil wires of a alternator, Sorry I cant explain it better ....E
  • 07-22-2010, 09:29 AM
    Tittyman
    Quote Originally Posted by RvRrat View Post
    Could be. They have diodes that can fail.
    To do this test do I need to unplug the main wire off the back or just the plastic plug on the side..also if it turns out to be the problem with the voltage drain, when I replace the alt. should I get a single wire or replace with another alt. with the plug on the side and the power wire out the back..also could a bench test show that it charges but the diodes are bad..thanks..
  • 07-22-2010, 09:27 AM
    RvRrat
    Quote Originally Posted by Tittyman View Post
    So your saying the alt. could be the problem for the voltage drain..
    Could be. They have diodes that can fail.
  • 07-22-2010, 09:25 AM
    Tittyman
    Quote Originally Posted by RvRrat View Post
    Unplug it for a couple days and see what happens. If you see a spark with you plug it back in...could be the problem.
    So your saying the alt. could be the problem for the voltage drain..
  • 07-22-2010, 09:21 AM
    RvRrat
    Quote Originally Posted by Tittyman View Post
    I just check the alt...has a single wire out the back with the plug connector on the side..also no sound system..
    Unplug it for a couple days and see what happens. If you see a spark with you plug it back in...could be the problem.
  • 07-22-2010, 09:20 AM
    Tittyman
    I just check the alt...has a single wire out the back with the plug connector on the side..also no sound system..battery is new from last year..holds a charge and is strong...only drains when the boat sits and I do not use the disconnect switch for the battery.
  • 07-22-2010, 09:15 AM
    RvRrat
    Stereo, amp, capacitors?

    11.5 is a little low. Could be the battery?
    Otherwise you could start lifting + or - wires and see if the voltage goes up. If it is a ground, there are ways of finding it, but you need a megger or variac with ac clamp on. Gets a little tricky.
  • 07-22-2010, 09:11 AM
    Tittyman
    I am running a stock alt..not sure about what a trigger wire is..I think the alt. is the old type with the plug, not a single wire.
  • 07-22-2010, 09:05 AM
    alkyexpress
    Quote Originally Posted by Tittyman View Post
    I have a battery disconnect switch. If I don't turn it off the battery will discharge..I do not have any lights in the guages, no elctronic distributor, no auto bildge pump..no nothing when the key is off..the battery will start out at 12.6 volts..check it three days later and it's down to 11.5 volts and continues to drop..where should I look for a discharge..thanks..
    Are you running a alternator ? the one with a trigger wire ? ..........E
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