A loose or poorly connected battery is harder to diagnose than you might think. Frequently that negative can be on the post and appear tight, but there really isn't a connection. You may see dome lights come on but not have enough power to start it.
Clean the terminals then spray on some terminal lubricant. Lay the foundation to assure you have good connection. Then move on to the next trouble shooting step.
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1972 Mustang Mach 1 351 Cleveland, 1972 Mustang Coupe 302
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