Q: truck was running fine,went to start it, and nothing. Doesn't turn over. on 2001 Ford Explorer Sport Trac

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battery had a bad cell and replaced but still have problem.Does this truck have solinoid on firewall
(1) Answer
Yes, just follow the positive battery cable. It has one on the starter as well. Do you know how to jumper (bypass) the firewall solenoid? If so this is an easy one to diagnose! Let me know.

A solenoid is nothing more than an on/off switch or relay!!!