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Vehicle speed control circuit tester

  • US 4,220,912 A
  • Filed: 07/20/1977
  • Issued: 09/02/1980
  • Est. Priority Date: 07/20/1977
  • Status: Expired due to Term
First Claim
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1. An apparatus for testing the current path integrity and operation of a speed control circuit having wiring harness and associated electrical components, the circuit including a first circuit connector connected to the ground potential of a power supply, a road speed coil connected between a second circuit connector and a third circuit connector, a normally closed set switch connected between a fourth circuit connector and a fifth circuit connector, and a normally open engagement switch connected between the positive potential of the power supply and the fourth circuit connector, the testing apparatus comprising:

  • a first and a second apparatus connector connected together and to the first and second circuit connectors respectively;

    a first visual indicator and a first current limiting means connected in series between a third and a fourth apparatus connector, said third and fourth apparatus connectors being connected to the third and fourth circuit connectors respectively;

    a second visual indicator and a second current limiting means connected in series between said first apparatus connector and a fifth apparatus connector, said first and fifth apparatus connectors being connected to the first and fifth circuit connectors respectively, whereby when the engagement switch is closed, said first and second visual indicators indicate the current path integrity of the portions of the speed control circuit including the road speed coil and the set switch respectively;

    wherein the speed control circuit includes a normally open ignition switch connected between the positive potential of the power supply and a sixth circuit connector, a feedback potentiometer connected between the second circuit connector and a seventh circuit connector and a brake light circuit element connected between the ground potential of the power supply and an eighth circuit connector and wherein the testing apparatus further comprises;

    a third visual indicator and a third current limiting means connected in series between a sixth and a seventh apparatus connector, the sixth and seventh apparatus connectors being connected to the sixth and seventh circuit connectors respectively; and

    a fourth visual indicator and a fourth current limiting means connected in series between said sixth apparatus connector and an eighth apparatus connector respectively, said eighth apparatus connector being connected to the eighth circuit connector, whereby when said ignition switch is closed, said third and fourth visual indicators indicate the current path integrity of the portions of the speed control circuit including the feedback potentiometer and the brake light circuit element respectively;

    wherein the engagement switch includes a momentary contact resume position connected to a ninth circuit connector, the speed control circuit includes a charge coil connected between a tenth and an eleventh circuit connector and a vent coil connected between the eleventh and a twelfth circuit connector and wherein the testing apparatus further comprises;

    a fifth visual indicator and a fifth current limiting means connected in series between a ninth and a tenth apparatus connector, the ninth and tenth apparatus connectors connected to the ninth and tenth circuit connectors respectively;

    a line connected between said first apparatus connector and an eleventh apparatus connector, the eleventh apparatus connector being connected to the eleventh circuit connector; and

    a sixth visual indicator and a sixth current limiting means connected between said ninth apparatus connector and a twelfth apparatus connector, said twelfth apparatus connector being connected to the twelfth circuit connector, whereby when the engagement switch is momentarily in the resume position said fifth and sixth visual indicators indicate the current path integrity of the portions of the speed control circuit including the charge coil and the vent coil respectively; and

    whereby the correct operation of the speed control circuit is indicated when;

    a. said ignition switch is open, said engagement and set switches are closed and all of said visual indicators are off;

    b. said ignition, engagement and set switches are closed, said first, second, third and fourth visual indicators are on and said fifth and sixth visual indicators are off;

    c. said ignition and engagement switches are closed, said set switch is open, said first, third and fourth visual indicators are on and said second, fifth and sixth visual indicators are off;

    d. said ignition and engagement switches are closed, said set switch is open, said brake light circuit element is actuated, said first, second and third visual indicators are on and said fourth, fifth and sixth visual indicators are off; and

    e. said engagement switch is in the resume position, said ignition and set switches are closed and said first through sixth visual indicators are on.

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