90 Amp Fuse Question

DS_G

Cadet
Joined
Jun 10, 2021
Messages
26
I am changing my 6.2 MPI starter and noticed that the hot 12v battery lead connects to the solenoid terminals directly, with the 90 amp fuse supplying the smaller red wire that goes to the red circuit breaker on top of the engine. I can’t see this level of detail on the wiring diagrams. Shouldn’t the 90 amp fuse be protecting the large battery wire instead?
Thx
 

dingbat

Supreme Mariner
Joined
Nov 20, 2001
Messages
16,081
I am changing my 6.2 MPI starter and noticed that the hot 12v battery lead connects to the solenoid terminals directly, with the 90 amp fuse supplying the smaller red wire that goes to the red circuit breaker on top of the engine. I can’t see this level of detail on the wiring diagrams. Shouldn’t the 90 amp fuse be protecting the large battery wire instead?
Thx
It's correct as wired.......
A starter can draw well over 200 Amp at start.
 

Fun Times

Moderator
Staff member
Joined
May 16, 2009
Messages
9,048
The following is a photo of a 90 amps fuse that is blown via the descriptions...Should be 12.4+ volt power on the left 2 wires too when good.

1718042149271.png
 

Bt Doctur

Supreme Mariner
Joined
Aug 29, 2004
Messages
19,292
what you will find is the alt protected by the 90A and also the main power for the but but thats after the 50A CB, blow the 90 and your dead in the water, move the red wire directly to the starters main post and all you can lose is the charge from the alt
 
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