[Question] Dual Battery w/3 way Perko wiring diagram?
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Dual Battery w/3 way Perko wiring diagram?

  1. #1
    Gramps
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    Default Dual Battery w/3 way Perko wiring diagram?

    I need help !! I have two batteries and a Perko switch with Both, 1, 2 and Off.. I want to isolate the Stereo system, hatch lifts and bilge pump to Battery #2 and all of the rest to Battery #1. When anchored/docked I want to put the Switch on #2 and run the Stereo and have power to the hatch lifts and bilge pump. When I start the boat I want to switch to #1 or 'both'. When on 'both' I want both batteries to be charged while running and of course use the Stereo...

    Can anyone help me with a wiring diagram?

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  3. #2
    Senior Member fed4life's Avatar
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    Check out this thread, its not exactly what your asking for but it might give you a little more insight. Beer:30 has some good knowledge on this.

    Onboard Battery Charger?

    Where im confused at is even if your battery switch is just on #1 or #2 all your accesories should still work, i.e. your bilge pump and engine hatch unless you want to change that. Whether my switch is on #1 or #2 all my stuff works and i do the same as you, when docked/anchored i switch the perko switch to #2 to run the stereos and keep the bilge pump on. On switch #1 i have a marine starting battery thats there in case my two batteries on switch #2 die, that way i can always start my boat.

    However, i always turn the switch to ALL when i start the boat so i charge all 3 batteries. Either way, i hope some of this info helps.

  4. #3
    Gramps
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    Thank you fed4life..but even after reading the other thread I am not getting all my questions answered.. and I am sure part of the problemis that I am really 'challenged' in this area...

    (1)If I have the Stereo system directly wired to Battery #2 and the Perko switch as well and on 2, will the Bilge Pump and Hatch Lifts both still work regardless of which battery they are wired too?(2) And, while using the Stereo in this configuration would it ONLY draw from Battery #2? That is my main concern, I do not want the Stereo to draw any power from Battery #1 unless I am running and the Perko is on All...

    (3)Then to start the boat I can leave the Perko on 2 or move it to 1 or All and start the boat?

    I understand that in order to charge both batteries while running I must have the Perko on All.. (4)So do I connect the two batteries at both the positive and negative or just at the negative as the Perko connects to the positives?
    Last edited by Eagle220; 06-06-2011 at 08:52 AM.

  5. #4
    08 Lighting Custom Boat Wet-N-Wild Lightning's Avatar
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    I don't understand this stupid switch either. I wanted mine wired like your wanting, #1 powering everything and #2 only for the system. I have had mine wired by 2 different people and mine still runs the stereo on both settings. So I'm too scared to leaving my stereo playing for to long because I don't know if it is also draining my starting battery. I would think that on #1 the system shouldn't work at all but maybe I'm wrong. I need to find someone that really know what they are doing to make sure it is right. Good luck with your

  6. #5
    Senior Member cruzer's Avatar
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    This all depends on how everything is wired. Assuming the stereo battery is on #2 and #1 is the starting battery, the following will be true.

    If the stereo is hardwired to battery #2, it will always work until battery #2 dies, regardless of the switch position (1,2,off,both).

    If all the rest of the stuff( bilge, lights, whatever) is wired to the output of the switch, they will work until the connected battery dies or until the switch is in the off position.

    Putting the switch in the #2 position, connects the #2 battery to all that extra stuff(bilge, lights whatever). This will cause battery #2 to discharge a bit faster depending on the usage of those extra items. This also makes batery #2 usable for starting the motor if it is not discharged and #1 is.

    Leaving the switch in #1 connects all the extra stuff (bilge, lights, whatever) to the starting battery and will eventually drain it, depending on usage. In position #1 you are putting the load from the extra stuff on the starting battery. The starting battery should have enough capacity to run the extra stuff for quite a while and still maintain enough charge to start the engine.

    What I would do is: Leave the switch in position #1 unless my starting battery is getting weak or the engine is hard to start and the starting battery is marginal. If either case is true, switch to #2 while stopped to save the starting battery.

    If your switch has the alternator field disconnect (cost more that $50, mfg part #8503DP), start the motor in position #1. When the starting battery is fully charged, move the switch to #2 to charge the stereo battery. Once #2 is charged, move the switch to ALL. Selecting ALL when the stereo battery is discharged will also cause the starting battery to help in bringing the stereo battery up to full charge, prolonging the time to get both batteries fully charged.

    If you have the cheaper version of the switch (cost around $40) leave the switch in position #1 to start the engine and charge the stereo battery when you are done for the day.

    My $0.02
    Last edited by cruzer; 06-06-2011 at 12:16 AM. Reason: clarification.
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  7. #6
    08 Lighting Custom Boat Wet-N-Wild Lightning's Avatar
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    Quote Originally Posted by cruzer View Post
    This all depends on how everything is wired. Assuming the stereo battery is on #2 and #1 is the starting battery, the following will be true.

    If the stereo is hardwired to battery #2, it will always work until battery #2 dies, regardless of the switch position (1,2,off,both).

    If all the rest of the stuff( bilge, lights, whatever) is wired to the output of the switch, they will work until the connected battery dies or until the switch is in the off position.

    Putting the switch in the #2 position, connects the #2 battery to all that extra stuff(bilge, lights whatever). This will cause battery #2 to discharge a bit faster depending on the usage of those extra items. This also makes batery #2 usable for
    starting the motor if it is not discharged and #1 is.

    Leaving the switch in #1 connects all the extra stuff (bilge, lights, whatever) to the starting battery and will eventually drain it, depending on usage. In position #1 you are putting the load from the extra stuff on the starting battery. The starting battery should have enough capacity to run the extra stuff for quite a while and still maintain enough charge to start the engine.

    What I would do is: Leave the switch in position #1 unless my starting battery is getting weak or the engine is hard to start and the starting battery is marginal. If either case is true, switch to #2 while stopped to save the starting battery.
    If your switch has the alternator field disconnect (cost more that $50, mfg part #8503DP), start the motor in position #1. When the starting battery is fully charged, move the switch to #2 to charge the stereo battery. Once #2 is charged, move the switch to ALL. Selecting ALL when the stereo battery is discharged will also cause the starting battery to help in bringing the stereo battery up to full charge, prolonging the time to get both batteries fully charged.

    If you have the cheaper version of the switch (cost around $40) leave the switch in position #1 to start the engine and charge the stereo battery when you are done for the day.

    My $0.02
    WOW!!! Now I'm really lost, LOL Who in Havasu could look at this and make sure it is hooked up right?

  8. #7
    Gramps
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    Thank you WnW.. I thought it was just me... Starting to think i am sorry I asked...So far only more confused.. I am trying to be clear in my writing and wish someone could just answer each of my questions one by one and in the order I asked them... Maybe I should number them ? Sorry everyone, maybe this is just over my head...

  9. #8
    Senior Member fed4life's Avatar
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    Im not an electrical expert by any means, in fact i consider it my weakest point. All i know is that wether im on position #1 or postion #2 on the perko thats what EVERYTHING s running off. So when im anchored up with the engine off and blasting the stereo i turn the switch to position #2 and its only draining the batteries that are attached to the #2 position, my starting battery on position #1 is NOT being discharged.

    When were getting ready to leave from wherever we are i turn the switch to ALL BEFORE i start the engine to charge all my batteries.

    **WORD OF CAUTION**: You might already know this but NEVER turn your battery switch AFTER THE ENGINE has already started, you will blow a fuse. So if you had your switch on the #2 position when you were anchored and you started your engine and where motoring away and you think, "shit, the batt switch is only on #2 and not on ALL, i gotta switch it so it will charge all the batteries." TURN OFF your engine, switch it to ALL then restart it and go.

    Either way, sorry i couldnt be more help my friend, i wish you the best of luck, i will PM Beer:30 and get him to respond, he seems like he really understands this stuff.

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