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Technical jumpstarting 6V from 12V

Discussion in 'The Hokey Ass Message Board' started by DjNeil, Nov 28, 2015.

  1. DjNeil
    Joined: Dec 29, 2011
    Posts: 210

    DjNeil
    Member

    Just tried to jumpstart a 6V positve earth 51 Mercury from my 12V negative earth truck
    I put the negative jump cable from my truck and put it on the ground on the block and then took the live jump cable from the live terminal on my truck and put it on the input side of the starter solenoid.
    after a short time the live jump lead was melting and the solenoid was smoking.
    The old Merc is now as dead as dead can be.
    I'm guessing i will be needing a new solenoid but what did i do wrong and is it likely i've toasted anything else
    Thanks
    Neil
     
  2. BLUDICE
    Joined: Jun 23, 2006
    Posts: 1,483

    BLUDICE
    Member

    You messed up - always go - to - & + to + I always have someone help - put the cable - to - first - then take the + cable and just touch the 6 volt car long enough to start it.
     
    Special Ed likes this.
  3. DjNeil
    Joined: Dec 29, 2011
    Posts: 210

    DjNeil
    Member

    thanks for that
    In my head i did.I put the truck negative to the ground on the engine block. i presume what you're saying is because it is positive earth the negative should have gone to the solenoid and the positive gone to the engine block
    what am i likely to have fried
     
  4. BLUDICE
    Joined: Jun 23, 2006
    Posts: 1,483

    BLUDICE
    Member

    Was the Merc battery involved at all?
    If not - should go to the solenoid and + to the block just like the battery would. Maybe the solenoid was already toast?
     

  5. DjNeil
    Joined: Dec 29, 2011
    Posts: 210

    DjNeil
    Member

    Didn't go near the Merc battery but think i did it the wrong way round and toasted the solenoid.Hoping i didn't take anything else with it
     
  6. Truck64
    Joined: Oct 18, 2015
    Posts: 5,095

    Truck64
    Member
    from Ioway

    Does a Ford solenoid "care" either way?
     
  7. AVater
    Joined: Dec 9, 2008
    Posts: 2,684

    AVater
    ALLIANCE MEMBER
    1. Connecticut HAMB'ers

    I think it cares 6 vs 12 volts but let's hear what the others say
     
  8. Yep. Hooked it up backwards with double the voltage = cooked.
     
  9. ROADSTER1927
    Joined: Feb 14, 2009
    Posts: 2,921

    ROADSTER1927
    Member

    When I jump a 6v from a 12v Always go neg to neg. Hook up the 12v and the ground cable on the 6v. I then have someone engage the starter and touch the 12v hot lead to the starter or output terminal on the solenoid. Gary
     

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