1990 problems air,headlights,horn, - CorvetteForum - Chevrolet Corvette Forum Discussion

C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

1990 problems air,headlights,horn,

Thread Tools Search this Thread
Old 01-13-2018, 05:21 PM   #1
Junior Member
Thread Starter
Member Since: Jan 2018
Location: memphis TN
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Default 1990 problems air,headlights,horn,

1990 AIR compressor will not engage,,,,,,2016 new a/c hose , compressor, orface value, dryer, a/c man hose , ac oil, Help,,,,,,,,,,,,,,,ok headlights have new motors and open and function ,,,but do not close.............horn does not work fuses all good,,,,,,,HELP ANY IDEAS
phxdude is offline   Reply With Quote
Old 01-13-2018, 06:33 PM   #2
CF Senior Member
Support Corvetteforum!
Member Since: May 2001
Location: Fairfax Virginia
Posts: 310
Thanked 70 Times in 65 Posts

Sounds like my car after I left it sitting for a couple years under a cover.

Be absolutely sure to start with a FULLY Charged battery. Measure the voltage with engine off it should be 12.5-7 Vdc Check the ground connections, one dirty ground will make all kinds of problems.

Using a good volt-ohm meter check the voltage at the fuse block at the end of the right dashboard. Find the best ground you can get, and measure the battery open circuit voltage. Then do the battery test at the battery. If they are different then you probably have a voltage drop like mine was when I first started trying to figure it out.

First check the little post behind the battery, it is easy to trace as the red wire from the battery (+) goes to it and supplies voltage and current to several parts of the car. Corrosion likes this spot, this is where several "Fusible Links" get their power from. I suggest removing and cleaning this connection if there is any sign of corrosion.

The main problem I had was that when I looked at the fuses they were "perfect" or at least looked perfect. I took my meter and checked the resistance and that way the fuse was "open". I replaced all the fuses and then I use a old point file and cleaned the connections at each fuse. It looked okay but after cleaning the voltage jumped up to full battery voltage! Last but not least is the mini fuse block behind the dash. Here were a couple grounds that went bad and once cleaned all the accessories in my car were working including the radio, it had full battery voltage. Suddenly everything worked like a charm.

Several of the problems you mention all tie to this one point, the fuse panel. I would look hard and find the electrical gremlins you are messing with.

Our Cars have several ground straps on them, if one is damaged or missing it can affect many parts of your car.

You did not mention whether or not the car was or is running. The more info we get the more we understand your plight and help you resolve it.

Good Luck and be careful with that old electrical system!
ctmccloskey is offline   Reply With Quote
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • 1990 problems air,headlights,horn,

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    A/C Compressor Problem dphins C6 Tech/Performance 19 02-21-2018 04:58 AM
    1992 C4 A/C Compressor/Hose Match-up papaleo1 C4 Tech/Performance 10 08-03-2017 11:22 AM
    FS: Complete A/C for 71 Coupe 454 Tim Ware C3 Parts for Sale/Wanted 2 05-17-2017 08:11 AM
    A/C Compressor appears dead. How much to replace? Tormania C5 Tech 27 11-16-2016 02:50 PM
    A/C Compressor help news2me C3 Tech/Performance 13 08-18-2016 11:36 AM

    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump

    Sponsored Ads
    Vendor Directory

    All times are GMT -4. The time now is 05:09 AM.

    We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
    • Ask a Question
      Get answers from community experts
    Question Title:
    Your question will be posted in: