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post #1 of (permalink) Old 06-23-2003, 11:46 PM Thread Starter
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dual battery question

well I just built a new dash. there is a bunch of wiring that is going on including a in the dash winch mount, wiring electric fan, gauges, and dual batterys. A while ago I researched the pros and cons of isolators and the solenoid method. I am going to just use the solenoid method since i have 2 of the same battery and a continous hold solenoid already.

Attached is a diagram. I am going to do the following since it is simple but just have a switch and use no oil pressure switch. could someone explain what will happen doing this? I think both batterys will be charging all the time but if one dies i can flick the switch and the other will be there. maybe i am wrong but i just need to know what is going on here.

also has anyone used the painless kit? Is it worth the money? any help would be great. thanks Mike
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post #2 of (permalink) Old 06-24-2003, 12:32 AM
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Re: dual battery question

All Ihave ever used is a switch; what is the point of the oil presure switch? And yes the painless peices are all high quality, and can be customized to your application.
your bro's JEEP is too much,too big and totaly too hip!!!
GAS. [img]images/graemlins/RockOn.gif[/img]
post #3 of (permalink) Old 06-24-2003, 12:54 AM
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Re: dual battery question

1. HTH
2. HTH-2
3. More Good Stuff
4. Read it over... and ask questions...
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post #4 of (permalink) Old 06-24-2003, 08:45 AM
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Re: dual battery question

I use this exact system and have not yet had any problems...
The oil switch is a "make" switch. When there is oil pressure the switch makes contact. This means when the vehicke isn't running the single battery is isolated. It can be run down to nothing, then the button switch ( I use a marine HD momentary contact switch) can be pushed while starting the vehicle, thereby using both batteries. The whole premise of this system is the oil switch. I guess if you use a simple "on/off" switch this will also work, but that leasves things to be forgotten and then it isn't childproof..I need childproof.. I am getting forgetful...
Very simple and easy to build..
Ricky...seeya...
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post #5 of (permalink) Old 06-24-2003, 10:03 AM Thread Starter
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Re: dual battery question

So this is my only concern. doing it with just a switch like i want.

both batterys are charging all the time?
Both cant die? and if one dies i can flick the switch to run the other one? thats all i want.

could someone please answer that. thanks Mike
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post #6 of (permalink) Old 06-24-2003, 10:24 AM
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Re: dual battery question

1. I'm not a fan of this type of system,
2. Because the batteries are not isolated when running.
3. If one battery goes bad...
4. Both batteries go bad.
5. IMHO... do yourself a favor,
6. And use a solid state Isolator system.


Last edited by LEVE; 03-24-2009 at 07:44 PM.
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post #7 of (permalink) Old 06-24-2003, 12:56 PM Thread Starter
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Re: dual battery question

why is it that ford comes through the factory with a solenoid setup and no isolator? Mike
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post #8 of (permalink) Old 06-24-2003, 01:02 PM
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Re: dual battery question

1. Lots of dual battery users don't like the .3 Volts DC that the isolator induces.
2. That's an engineering decision.
3. And they've got a bizillion of 'em sitting around for other uses.
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