2004 Starter Circuit: Sumpthin' Ain't Right!

[imp]

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

 

[Number4]

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

 

[imp]

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

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

 

[Number4]

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.

 

[imp]

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.

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!

 

[TechGuru]

It would need to be a 1000amp fuse, I'm sure the cable itself is the fuse, lol.