how do i delete this topic, its now debunk'd

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i want to run basically a 12v accessory socket and a stereo. and you do point out a problem that i am mulling over now. the crossover wire that turns the set of batteries into a series set, shorts the charging circuit. and thats no good. so then yes i think your idea of using basically a 6v to 12v power supply to create a seperate 12v circuit is a better idea. that way i do not have to hook the batteries up in series. hell i dont even need 2 batteries just 1 big good 6 volter. on amazon they sell 6v to 12v DC to DC converters and they are 120. on ali express i see 500 and 700 watt units.

Ohh wow that is very fancy. I dig it Thankfully i live in an area where AC is not really needed so i get to have a nice simple engine compartment. The work you did though is very useful. And yeah i see the "Series-Parallel Switch" is for starting really but what it does more than anything is show me that its OK to run 2 different voltages at the same time. The thing i guess i was worried about was charging batteries at 6v in parralel while also having them wired in series so they can be drawn from in such a way to get 12v. i dont THINK ive cauzed any crazy short situation. it should just work.... and the batteries i would think, should ever so smoothly balance themselves if i keep a constant 12v load upon them with something like say a standby headless bluetooth enabled amp sitting in the trunk.

Aside from pulling too hard off of this setup and making sure muh batteries are being charged in a balanced way + making sure my charge wires from my regulator are nice n fat + having nice fat generator wires to my regulator and to my frame ground point. i think this sonofabitch will work....

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WOW great information thank you! an actual product that does exactly the thing im thinking of this is amazing. this schematic is extremely helpful. it also shows me im not that crazy. Also you are right to point out how important charge balancing is. I plan on making a fancy cable for hooking the power up to teh batteries and they are both the same brand. spec and even production month. My idea was to make a T shaped pair of jumpers that have the power wire come in right in the center so it is balanced physically. the rest is up to physics! i call it my eyeball battery balancer. Ideally it would be cool to put the batteries right in the engine compartment. but they are large golf cart batteries so i may end up having to run some wires to the trunk and relocate the battery to there. This is gonna take some big chunky wire and careful planning but it doesnt seem too far off from working.on the other hand i could buy a couple of those small optima AGM 6v batteries and try to cram them both in the engine compartment.

Tell me if I am crazy here.

My car is a 1948 packard with a Delco-Remy 6v Postive ground genny and regulator. My idea is this. Instead of converting the car to 12v. Instead i will run 2x 6v batteries in Parallel and then draw off of them in Series for my 2 loads "a 12v cig lighter and a 12v stereo system"

These 12 volt loads will have to be direct wired to the battery instead of using the frame for ground

How insane is this idea?
the stock genny is 35amp. so it has only a 210 ish watt output. even with that low power output i could still run a small stereo and amp with a small sub. I could also upgrade the 6v genny to one of the larger 60amp units so i can have a sexy 360watts of POWAH

Also i understand that the negative Hot comes from the regulator not the genny, but for simplicity sake on the drawing i show it coming directly from the genny.

This setup allows you to operate ALL of the cars stock electronics un-altered and at their native 6v positive grounded state. While also having a source to power 12v accessories up to a modest wattage. The 12v output could be used to charge 12v batteries in the trunk that directly supply high powered amps with juice while the genny just provides modest support with its meager 200ish watts of output. This seems like it would be able to play music at fairly high enjoyable wattages "500 watts of sound is usually enough to rock most peoples worlds without going into insane bass levels that rock neighbors out" Currently my experiment batteires are a pair of 200AH duracell 6v golf cart batteries that i plan on forcing my poor old genny to charge in parallel

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These systems are fun and can work great IF you install them correctly. looks like you did a great job :D nice work

Check the voltage on the battery , if its way way below 5.5 volts or even below 5 bolts. its probably a toast battery and it wont take a charge from a normal battery charger. it will need a special high voltage reconditioning charger hooked to it and probably need a water change.

General rule of thumb is a battery lasts about 3 years before its in the "red zone" after 3 years its a crap shoot how long the battery will last. it depends on how well its charged and how hot it gets cooked on a daily basis.

usually if a battery sits dead or nearly dead for a month or a few weeks. its gonna be damaged and not take a proper charge anymore. Even if it does charge it will not have much capacity in it.