Complete loss of power

Discussion in 'Street/strip 400/430/455' started by RWC, Apr 16, 2023.

  1. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    With MSD boxes there are two 10 gauge wires, red and black. They are meant to be wired directly to the battery. The thinner red wire goes to a switched ignition source, it turns the box on when you turn the key to run. The thinner orange and black goes to the coil + and - respectively. The white wire is used with points, the green/violet wires, with a magnetic pickup. That's it. There is no way for the box to draw from the battery unless it is on. That only happens if you turn the ignition key to run, IF, it is wired correctly.
     
    mbryson likes this.
  2. RWC

    RWC ‘69 Buick Skylark

    I think that the “IF” is the real question. Hopefully they will fix it. Thank you again for taking the time !
     
  3. stellar

    stellar Well-Known Member

    Still think something else is going on also. Strange to have enough battery to start and be totaly dead shortly after .
     
    john.schaefer77 likes this.
  4. 12lives

    12lives Control the controllable, let the rest go

    Agree - previous behavior indicates a loose connection somewhere. Hope fully the mechanic will find it. Make sure he looks for it after he fixes the dead battery issue.
     
  5. RWC

    RWC ‘69 Buick Skylark

    I want to thank everyone for all your help. Turns out it was a combination of poor installation. Ground wire to the block was not connected with the proper size of bolt, wire from alternator to battery was 14 gauge ( replaced it with 4 gauge) and battery was replaced. All good, for now. Thanks again !!
     
    FLGS400 and patwhac like this.
  6. RWC

    RWC ‘69 Buick Skylark

    Hello everyone. I was wondering if you would happen to know why my heat in the car never shuts off. I have a ‘69 Buick Skylark with a 1970 Buick 455. This problem started right after switching out my 350. Thank you
     
  7. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Do you have a heater control valve? It could be stuck, or inoperative, and routing hot coolant to the heater core full time. It is controlled by vacuum. Does your 69 have A/C?
     
  8. RWC

    RWC ‘69 Buick Skylark

    I’m not sure on the heater control valve. My ‘69 skylark previously had air conditioning but there is no air conditioning on the newly installed ‘70 455 if that helps
     
  9. RoseBud68

    RoseBud68 Well-Known Member

    It would look like this.
    [​IMG]
     
    FLGS400 likes this.
  10. RWC

    RWC ‘69 Buick Skylark

    I will check tomorrow and then I’ll post again. Thank you
     

Share This Page