Jump to content

No ac, blinkers or cooling fans, fried pcm

Recommended Posts

So i have an 04 silverado,  was doing some electrical work and i accidentally dropped a wire on the ground post and it sparked, next thing i know the truck wouldnt crank with the key unless i jumped the starter relay,  the blinkers stopped doing anything, not even the indicators on the dash would light up, but the hazards worked, the tachometer was going nuts, and the AC compressor will not turn on, replaced and flashed the PCM with a new one and the truck finallt cranks and tach is back to normal, but the AC and blinkers still dont work, ive checked all ac and turn signal related fuses and all are good, freon is full and properly charged, what gives, also installed a new multifunction switch for the blinkers and no luck, any suggestioms are greatly appreciated

Link to comment
Share on other sites

Lesson learned i hope. Always disconnect the negative battery cable before you do any electrical work just for this reason.

Start by using a schematic and an Ohm meter and check where you have current and work your way to the dead spot.

Link to comment
Share on other sites

Sorry about the bad news. Let's all take notice here about disconnecting the battery before servicing anything electric, I seldom do unless it's the battery I'm working on and I know better, I'm just too old school. lazy and stubborn. I never had no trouble like this on my '63 Galaxie, '64 Galaxie, '67 GTX, '71 Chevelle, '71 C-10, '73 C-10, '78 C-10, '38 S-15, '85 S-10 by gosh!

Some thing is shorted out or burned to the point the circuit is broken, it could be a bad ground; remember with any freaky  electric issue bad grounds are often the culprit. Keep us informed!

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.