Question about Ford Thunderbird

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I have a '72 T-Bird 429 in a 1 ton Ford truck ('73). I need an electrical diagram because the engine will not turn over - electronic ignition OK, distributer OK, battery OK with power to firewall solenoid. Could it be the ignition switch?

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  • elski1943 Jul 16, 2010

    Thise were the only two things I thought might be the problem. I just needed to know how to test them. If neither of them are defective I will be writing back.
    Thank you.


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It sounds like the ignition system is not sending the signal to the starter selenoid or the selenoid is defective..


1.- Try jumping the selenoid's two terminals to make sure the starter gets juice.

2.- Apply 12v to the S terminal in the selenoid, it should engage the starter, if not, replace selenoid, if starter engages, perform next test.

3.- Use a Voltmeter set on DC, place black end on the battery's (-) post and with the red lead, check starter selenoid, one terminal should always have 12v or more and the other one should have the 12v only when the key is on the RUN position. if test fails,the wiring or the ignition switch are defective.

NOTE: The selenoid needs to be grounded to the chasis by the fastening screws, check for clean tight connection.

If you still need wiring diagram of the starting system, let me know.

Good Luck!!

Posted on Jul 15, 2010

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