Register now to get rid of these ads!

Technical 6 volt and 12 volt combined?

Discussion in 'The Hokey Ass Message Board' started by big"D"®, Oct 30, 2015.

Tags:
  1. big"D"®
    Joined: Sep 24, 2012
    Posts: 7

    big"D"®
    Member

    I'm wondering if it's possible to run both 6 volt and 12 volt electrical systems simultaneously in the same vehicle. Most of my electronics will be 12 volt. But I have several items such as a clock, horn and dash lights that are 6 volt. So what if I had two complete systems? one 6 volt battery and one 12? Has anyone heard of this? It would be in a scratch rat custom so complete creative flexibility...

    Thanks for any input...
     
  2. Swap the bulbs for 12 volt ones, get a Runtz for the clock and the horn doesn't really care.
    BTW, Rats are not welcome here
     
    Model T1 likes this.
  3. Hudson52sam
    Joined: Oct 3, 2015
    Posts: 69

    Hudson52sam

    They sell reducers, its just a lil diode looking thing with a wire on both sides, there pretty cheap, this one here is $3.00 not sure how good it is
     

    Attached Files:

  4. hedg12
    Joined: Feb 1, 2009
    Posts: 46

    hedg12
    Member

    You can run both as long as it's a negative ground system, but it's probably not worth the headache. Easier to just switch bulbs and use a converter.
     

  5. big"D"®
    Joined: Sep 24, 2012
    Posts: 7

    big"D"®
    Member

    Reducers are that cheap now? And you can never stop a rat... Thanks.
     
  6. Ebbsspeed
    Joined: Nov 11, 2005
    Posts: 5,490

    Ebbsspeed
    ALLIANCE MEMBER

    You can run both negative grounds, both positive, or one each way. He's asking about running two separate electrical systems, so they can have either polarity as ground without causing issues.

    I have no idea what a "scratch rat custom" is, but it sounds to me like a real cluster fuck in the making.
     
    Model T1 and the man like this.
  7. If you install a standard 12 volt system , then use 2 X 6volt batteries (in series), you can pick off 6 volts from one battery and run all your 6 volt junk from there. They used to make 12 volt batteries with exposed cell joiners (lead strips), which you could drill and tap in the right spot and you could have6 volts. I haven,t seen them for a long time, but they may still be avaiable.
     
    jazz1 likes this.
  8. big"D"®
    Joined: Sep 24, 2012
    Posts: 7

    big"D"®
    Member

    Call it what you like, I like it...
     

    Attached Files:

  9. big"D"®
    Joined: Sep 24, 2012
    Posts: 7

    big"D"®
    Member

    Now that's what I'm looking for. Bravo 36roadster... Thank you!
     
  10. Ebbsspeed
    Joined: Nov 11, 2005
    Posts: 5,490

    Ebbsspeed
    ALLIANCE MEMBER

    This works, but one of the batteries will fail sooner than the other, due to uneven charging by the alternator/generator. The greater the draw of your 6-volt items, the sooner you'll have a battery issue.
     
  11. seb fontana
    Joined: Sep 1, 2005
    Posts: 6,952

    seb fontana
    Member
    from ct

    ""I have no idea what a "scratch rat custom" is, but it sounds to me like a real cluster fuck in the making.""

    Had to laugh..Sorry..
     
  12. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 9,516

    Rusty O'Toole
    Member

    Go ahead. Use a 12V alternator, starter, coil, lights etc.

    For the 6V stuff take a center tap off the battery. Remember you need bigger wires and fuses for 6V, twice as big as 12V for the same load.
     
  13. volvobrynk
    Joined: Jan 30, 2011
    Posts: 3,587

    volvobrynk
    Member
    from Denmark

    The first unofficial rule of the hamb; post plenty of pics.
    As we say: pics or it never happend!

    Second rule: no rat rods!

    Third rule; one picture is teasing, and you don't want your friends to know you are a tease!

    Although the grill ain't common, It ain't bad.
    The wheels are an eye saw, but that is pretty close to being a traditional hot rod.
    Please post more pics, and stop referring to it as a RR, and give it the respect it deserves!
    Call it a hot rod.
     
    Last edited: Oct 31, 2015
  14. volvobrynk
    Joined: Jan 30, 2011
    Posts: 3,587

    volvobrynk
    Member
    from Denmark

    Regarding the original question; yes it can be done, but it shouldn't.

    You could choise to set it up with two 6v batteries, and pull and equal amount from the two batteries.
    And then draw from both batteries for everything else.
    If you draw to much 6v from one batteries it drains/damage one battery.
    Some tow trucks has the same setup so it should work.

    But compares to change over to one or the other, will prolong the life of a batteries, and enhance the quality of the whole system.

    And since you scratch build the full car, why not the electric? You will be more happy about one or the other!
     
    302GMC likes this.
  15. aaggie
    Joined: Nov 21, 2009
    Posts: 2,531

    aaggie
    ALLIANCE MEMBER

    The key to life is to keep things simple. You are trying to date two women at the same time and it will not end well. Use the voltage drops.
     
    Hudson52sam, Model T1 and volvobrynk like this.
  16. volvobrynk
    Joined: Jan 30, 2011
    Posts: 3,587

    volvobrynk
    Member
    from Denmark

    Worst case scenario: two mothers in law.

    That can make any man crimp in all the wrong places
     
    tb33anda3rd likes this.
  17. BJR
    Joined: Mar 11, 2005
    Posts: 6,893

    BJR
    Member

    Change the bulbs to 12v, the horn will work on 12v just louder. I ran a 6v clock on 12 volts with no problem. They only energize the coil for a moment to wind the clock so it will not burn out. And no it will not run twice as fast.
     
    Hudson52sam and volvobrynk like this.
  18. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 9,516

    Rusty O'Toole
    Member

    Years ago I built a rod out of a 6V vehicle and 12V motor. Ran a mixture of 6 and 12 volts for years, using 2 batteries. But you could do the same thing with a 12v battery and take 6v off the middle. I tested my batteries regularly and planned on switching them if one showed more wear or discharge but it never happened.
     
    302GMC likes this.
  19. 302GMC
    Joined: Dec 15, 2005
    Posts: 6,814

    302GMC
    Member
    from Idaho

    Two 6v batteries gives a bunch more cranking capacity in our cold winters ...
     
    volvobrynk likes this.
  20. volvobrynk
    Joined: Jan 30, 2011
    Posts: 3,587

    volvobrynk
    Member
    from Denmark

    How does one get 6v from one 12v battery?

    I know I'm slow, but that sounds like a typo.
    Don't you mean getting 6v between the two batteries?
     
  21. You used to be able to buy 12volt batteries with lead cell jumpers, which you could pick 6v from.
     
    volvobrynk likes this.
  22. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 9,516

    Rusty O'Toole
    Member

    You attach a wire to the lug that connects #3 cell to #4 cell. This used to be easy when the lugs were exposed. Now they are covered with plastic but they are still there. Cut away the plastic on an old junk battery and you will find them. Once you know where to drill you can drill a hole and put in a screw. This is called a center tap.
     
    volvobrynk likes this.
  23. nrgwizard
    Joined: Aug 18, 2006
    Posts: 1,308

    nrgwizard
    Member
    from Minn. uSA

    Looks to me like an 'odd-rod' roadster in the making. '24-'26 Hudson grill shell? Got a shell n grill that's similar. I prefer the 'odd-rods' . Usually much more interesting, but a lot of folks think they have no value, so's they hack them. Too bad, really... ;( . FWIW: drop the rat part, it'll thank you by looking better. :D .
    Marcus...
     
    volvobrynk likes this.

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.