Can a blown fuse cause other fusees to blow

1997 LINCOLN TOWN CAR
192,000 MILES • 4.8L • V8 • 2WD • AUTOMATIC
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BYRONLOFTIS
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  • 1 POST
So I have been having trouble with my car it quit running a while back and the fuse for the power-train control module keeps blowing. The car tries to start but does not turn over and today I found that the fuse for the fuel pump was blown. Can that be the reason that my car keeps tripping the PCM fuse?
Aug 22, 2018 at 5:34 PM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
Good morning.

No, a bad fuse will not cause another fuse to fail.

A fuse fails from current draw that exceeds the value of the fuse. You need to find the reason for the high current draw.

It could be from a short in a wiring harness or the component it is controlling.

You need to have the circuit tested for both the fuel pump and the PCM. If there is no short in the harness, then it may be a bad PCM and a fuel pump.

Whatever you do, never install a larger rated fuse in the circuit or you could cause a fire.

Roy
Aug 23, 2018 at 3:37 AM
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