1979 C3 Owners - Wiring problem???
Thread Starter
Intermediate
Joined: Feb 2007
Posts: 40
Likes: 0
From: Marshall Texas
1979 C3 Owners - Wiring problem???
Ok...I've tracked down a majority of the wiring after ripping out my dash replacing all new gauge clusters, and a new circuit board for the tachometer. However, I still cannot get the tach to work correctly. The tach filter was not good so I took that out and just ran straight. Still nothing. Does someone have some tips? Do I run new wiring? What are the color schemes from the wiring harnesses that plug into the back of the speed/tach gauge cluster? That might help me a little better. I have two plugs in the back of the speed/gauge bezel. Anyone have any suggestions? I would post pics...but I don't think it would help much sense most of the work has to be done crawling up under the dash, and using an ohms meter.
Racer
Joined: Sep 2006
Posts: 484
Likes: 0
From: McComb Ms.
i have a '79 and i only have one plug in the bezel. i had to run another ground when my tach failed. i had my bezel removed so i feel your pain. my suggestion to you would be to pull the bezel and trouble shoot. i found fault in my wiring between fuse and bezel plug and bypassed it. i actually took the bolts out of my fuse box to remove it and replace the faulty wire. it didn't want to move so i gave up that idea and ran another wire altogether.
Le Mans Master
Joined: Mar 2001
Posts: 6,640
Likes: 287
From: Ann Arbor Michigan
On my 78', there is a pink wire that comes from the "gauges fuse" to the electronic circuit board on the back of the tach. From this circuit board, a black wire goes to ground and the white wire goes to the tach terminal on the distributor cap. Your 79' should be the same.
Thread Starter
Intermediate
Joined: Feb 2007
Posts: 40
Likes: 0
From: Marshall Texas
Thanks guys!
I was thinking of pulling the fuse box as well....but wanted to get some consulting here. Am I naive...or does anyone else think that if they make a post someone will give them a simple solution :o
Heel & Toe
Joined: Jul 2006
Posts: 22
Likes: 0
Instructions for replacing the speedometer circuit board
Ok...I've tracked down a majority of the wiring after ripping out my dash replacing all new gauge clusters, and a new circuit board for the tachometer. However, I still cannot get the tach to work correctly. The tach filter was not good so I took that out and just ran straight. Still nothing. Does someone have some tips? Do I run new wiring? What are the color schemes from the wiring harnesses that plug into the back of the speed/tach gauge cluster? That might help me a little better. I have two plugs in the back of the speed/gauge bezel. Anyone have any suggestions? I would post pics...but I don't think it would help much sense most of the work has to be done crawling up under the dash, and using an ohms meter.
Thanks!
