C4 1989 convertible gauge problems
Thread Starter
8th Gear
Joined: Jun 2010
Posts: 8
Likes: 0
C4 1989 convertible gauge problems
I recently bought a nice 1989 convertible, fairly good shape considering 166 tmiles. but i have a problem, all gauges are dead, including revs and speed. background light and dimmer working fine. this is probably a general fault as i doubt all gauges broken. I know that this is quite common problem on the electronic models, but would preciate if somebody can suggest a "likely" fault. 
Melting Slicks
Joined: Jul 1999
Posts: 3,214
Likes: 101
From: Decatur, Alabama
Can you shine a flashlight on the cluster and see if the numbers are changing but led are not lit up? There are a lot of things that can cause cluster not to work. Grond wire on top of transmission is #1 behind plain ol' bulbs burned out. After that, you really need a service manual to check individual circuits. You may need a cluster rebuild but guessing gets expensive. Does the cruise control work?
Thread Starter
8th Gear
Joined: Jun 2010
Posts: 8
Likes: 0
opened up the cluster, replaced one broken bulb. could not see any electronic problem (like poor soldering etc.) fit the panel back, same result, all gauges dead. all connections looks good as well. hmm....
Le Mans Master
Joined: Jan 2010
Posts: 8,553
Likes: 3
Which cluster?
I had a sim situation.
My trip cluster wasn't connected.
Look at that.
Thread Starter
8th Gear
Joined: Jun 2010
Posts: 8
Likes: 0
I had a sim situation.
My trip cluster wasn't connected.
Look at that.
checked all cluster connections, meassured the voltage, seems to be a low...on the B-connections, about 5 volts, 12 at the fuse and at D-connections.
(had to use common ground, as B1 is fed from D3, if I understand it correctly, i.e. if D 3 is unconnected, the whole C,D connector is to be able to meassure)
seems to be a hard nut to crackle!
My trip cluster wasn't connected.
Look at that.
checked all cluster connections, meassured the voltage, seems to be a low...on the B-connections, about 5 volts, 12 at the fuse and at D-connections.
(had to use common ground, as B1 is fed from D3, if I understand it correctly, i.e. if D 3 is unconnected, the whole C,D connector is to be able to meassure)
seems to be a hard nut to crackle!
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