Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

alternator wire

Discussion in 'The Garage' started by jaros44, Jun 9, 2006.

  1. jaros44

    jaros44 1/2 ton status

    Joined:
    Jul 12, 2005
    Posts:
    408
    Likes Received:
    0
    Location:
    Outside Phila. Pa.
    hey does anyone know the brown wire coming out of the weather proof plug on a gm alternator. is it suppose to be hot along with the red wire coming into the alternator. thanks

    jon
     
  2. diesel4me

    diesel4me 1 ton status Premium Member

    Joined:
    Jul 24, 2003
    Posts:
    17,561
    Likes Received:
    942
    Location:
    Massachussetts
    what year??

    If your talking about a 73-87 alternator,the two wires on that plug AND the big red one in the rear that has a stud and nut should ALL have 12V when the motor is running,or with the key "ON" and the motor off...

    The brown wire delivers 12V to the feild coil in the alternator,to "energize" it,and make it charge--you need current to MAKE current!..if it gets no voltage,it wont charge..period..

    The other small red wire on the plug sends 12V to the regulator,it needs to be "hot" too,or it may not charge,or charge at an improper rate..:crazy:
     

Share This Page