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    Author Topic: Tan cover with two blade electrical terminals on vacuum advance?  (Read 606 times)

    Offline ronrace1

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    Tan cover with two blade electrical terminals on vacuum advance?
    « on: March 25, 2013 - 07:27:20 PM »
    On my 1970 440 6 pack Challenger, there is a tan "box" with terminals...see pics...with no wires attached. What is this for?
    Thanks
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    Offline anlauto

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    Re: Tan cover with two blade electrical terminals on vacuum advance?
    « Reply #1 on: March 25, 2013 - 07:43:00 PM »
    Electronic vacuum advance. I know 71's had it, never knew 70's did... :clueless:

    One wire shares the ground wire with the ground from the idol stop solenoid, and the other plugs into the engine harness.

    In 1971 it would have been on a Prestolite dual point distributor.
    « Last Edit: March 25, 2013 - 07:49:33 PM by anlauto »
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    Offline mopar jack

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    Re: Tan cover with two blade electrical terminals on vacuum advance?
    « Reply #2 on: March 25, 2013 - 08:56:04 PM »
    It retards the timing about 7 degress when the throttle is closed at idle. I've seen this on a 70 New Yorker with a 440 and on my 71 road runner with a 383. I haven't seen one work after 40 years the coil is usually burned open.
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