Blowing starter fuse when not hooked up

Asked by Knnthasay89 Jan 01, 2021 at 07:54 PM

Question type: Maintenance & Repair

Okay a buddy has been having troubles with is
1999 ford f150 4.2L. It keeps blowing the starter
fuse. I have replaced starter, ignition switch,
neutral safety switch, starter solenoid on firewall.
Still blowing fuses. Thank you for any help

2 Answers


it's possible you could have wrong battery in the car because the battery and starter are on same circuit ( yes, can jump start a any battery based vehicle from starter and not battery). So, I am thinking it's real similar to a reverse polarization effect. in order for a fuse to go like that there has to be wrong current somewhere. SECONDLY, what could be the problem is the starter relay in the fuse box. Maybe a relay was replaced yet it's not the same spec, and that will give you issues down the line of that circuit. It's also quite possible that the fuse is too weak of amperage to withstand current in line and gets zapped on the crank. When I go to junk yard and pull every dad gone relay I can off of fuse boxes ( label as I go). It's the same diagram every time, with a load side and flex side.

1 people found this helpful.

Sounds like a short to me. Check the starter wires.

1 people found this helpful.

Your Answer:

Own this car?

Share your experience with others.

CarGurus Experts

  • #1
    Gene Arnett
  • #2
  • #3
View All

Know more, shop wisely


Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.