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Blown fuses at ignition

Tiny
FORDBLUEZ
  • MEMBER
  • 2005 FORD RANGER
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 1,800 MILES
The ecm /02 sensor/and flasher light fuses blow instantly on ignition. I am pretty sure it will not start with out the pcm fuse in place. But could I try leaving out the other two and leave the ecm fuse in alone and see if it blows? And just keep going if the second one say the o2 sensor fuse does not blow. Then I should stop and back probe the fuse to the flasher switch.
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Sunday, May 15th, 2016 AT 7:54 PM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check for a short in system it may be a wire that has rubbed bare or the O2 sensor may be causing it.
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Monday, May 16th, 2016 AT 6:49 AM
Tiny
FORDBLUEZ
  • MEMBER
  • 4 POSTS
Thank you. I went through the wiring harness, did not find any thing at all. I am going to show my little brother how to use a multi meter today I will start by checking the 02 sensor new cads were recently installed.
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Monday, May 16th, 2016 AT 10:53 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,640 POSTS
My bet is the o2 sensor they have a history of shorting out.

Here is a guide to show you what you are in for

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Let us know what you find

Best, Ken
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Tuesday, May 17th, 2016 AT 7:24 PM

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