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Can a blown fuse cause other fusees to blow

Tiny
BYRONLOFTIS
  • MEMBER
  • 1997 LINCOLN TOWN CAR
  • 4.8L
  • V8
  • 2WD
  • AUTOMATIC
  • 192,000 MILES
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?
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Wednesday, August 22nd, 2018 AT 5:34 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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
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Thursday, August 23rd, 2018 AT 3:37 AM

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