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2004 Starter Circuit: Sumpthin' Ain't Right!

Discussion in 'Stock 2002 - 2005 Explorers' started by imp, June 11, 2016.

^^Searches ExplorerForum.com^^





  1. imp

    imp Well-Known Member

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    Below is page 20-1 of my '04 Explorer Wiring Diagram Ford Shop Manual. The fuse no. F 1.12 is a 50-Amp. fuse, which feeds the Starter Motor when the Starter Relay "pulls-in". Since when did Starting Motors draw less than 50 Amps? Looks to me like a guaranteed blown fuse. Am I missing something here? imp

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  3. Number4

    Number4 "I'm counting to 3, then I'm getting your dad." Elite Explorer

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    The starter-relay is protected by 50 amps, but the power from the bat.tery to the motor is not fused at all.
     
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  4. imp

    imp Well-Known Member

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    How right you are! I missed the fact that the coils shown are Solenoid Coils, the motor's heavy current draw is not fused, as you said. Thanks for pointing that out! imp
     
  5. Number4

    Number4 "I'm counting to 3, then I'm getting your dad." Elite Explorer

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    Kind of odd isn't it? I relize it's a large gauge wire, but you'd think it'd still be fuse or circuit breaker protected.
     
  6. imp

    imp Well-Known Member

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    Overcurrent protection is usually to provide assurance against starting a fire. A locked starter motor might draw 700 or more amps, which given the very low resistance of it's connecting cables, would not heat them much, or quickly. If the starter catches fire internally, Oh well!
     
  7. TechGuru

    TechGuru Well-Known Member

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