digicluster and fuel system shuts off ????
Thread Starter
Drifting
Joined: Apr 2004
Posts: 1,453
Likes: 0
From: crystalriver Florida
digicluster and fuel system shuts off ????
I've been experiencing a problem with electrical system since yesterday---driving down the road the voltage keeps fluctuating from 13.7-13.1 then when it drops lower the digicluster goes black and the car seems to shut down and then a few seconds later runs back to normal----I have this strong feeling its a Ground problem for the ecm.....I ran a jumper wire from a gx location to "1" ground wire on ecm---INCASE the ecm gx is loose somewhere, but I haven't tapped into the other gx wire (isn't there 2 gx wires for the ecm unit?) black/white wires? obviously the wire i jumped from has not corrected the problem. i don't know where the gx points are for the ecm--back of engine somewhere ?? I have the shop book for my year car, but I can't find the help i need....my car is an 85--Any help please
Thread Starter
Drifting
Joined: Apr 2004
Posts: 1,453
Likes: 0
From: crystalriver Florida
weird thing is I noticed yesterday that my AC does not blow cold anymore....it did before, not sure if that has anything to do with this new problem....I have a friend who owns an auto electric shop and he metered my battery and alt and said they are putting out a good 14.2-14.3 volts, when my digicluster was reading like 13.6 SAME time he was checking....
Thread Starter
Drifting
Joined: Apr 2004
Posts: 1,453
Likes: 0
From: crystalriver Florida
I'm going to take it my friends shop and let them take care of me, was just hoping it was something I could fix without spending too much time on it...opinions are still welcome and i could mention them to him...
Race Director
Joined: May 2006
Posts: 10,691
Likes: 71
From: Phoenix Arizona
Sounds like a ground problem. I believe the major ground connection is on the left (driver) side above the oil filter on an 85. It's kind of a stinker to get to, and should have about 5 or 6 straps connected to an 18 mm bolt. I'd check all the ground connectors on the engine and the frame, there are several.
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
I was talking to Gordon Killebrew about a problem once and he said low voltage could take the cluster out....find out what's wrong before you end up having to buy a new or rebuilt cluster. 
it does sound like a ground problem.
it does sound like a ground problem.
Thread Starter
Drifting
Joined: Apr 2004
Posts: 1,453
Likes: 0
From: crystalriver Florida
the cluster is fine, its already been rebuilt...I'll check the ground pts around the engine if I can lift the car up some I'll get under there...where are the distribution blocks at ?
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
on the drivers side back of the head there is a ground block (don't need to get under the car) there are a few grounds there, and from there, there is a braided ground strap that goes to the frame rail just in front of the battery.
Thread Starter
Drifting
Joined: Apr 2004
Posts: 1,453
Likes: 0
From: crystalriver Florida
I think I found the problem and fixed it!!! i was getting ready to swap out the alternator with a 2nd alt I had stored away and I unhooked the power wire harness and noticed the small wire pulled right out of the harness (there are 2 wires in the connector large red wire and a smaller brown wire) so i restripped it and crimped it back in and what do you know!! So far so good on the voltage----But the AC is still a puzzle, blows air, but not cold. the compressor is not kicking in while at idle with ac on. I checked that wire harness and fuse--they check out good....haven't looked in my shop manual yet, but I can say...The Whole ac system has been replaced with new parts and blew icecold air untill i checked it yesterday.....Any opinions on this?