77 instrument cluster not working
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Joined: Oct 2011
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From: small town Nebraska
77 instrument cluster not working
The other day i pulled the instrument cluster out if my 77 to clean out the mice nest behind it since it sat in a pasture for 8 years before i got it.i put it back in today and nothing worked. No lights or gauges or anything. Im not sure if the printed circuit board is bad or if maybe a ground got pulled out somewhere. I was ocassionaly having problems with my gauges as well before this. Any help would be appreciated.
MSEE
Joined: Apr 2004
Posts: 10,386
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From: Austin, TX
Let's first try to understand if the problem is a single thing that's affecting everything, or a coincidental occurrence of several problems. The cluster illumination doesn't work, but what about the illumination behind the heater controls or the wiper switch? The turn signal indicators don't work, but what about the turn signals themselves? In other words, are all the problems truly isolated to the cluster, or are there several other problems that just happen to touch the cluster?
It's also possible the ground connection into the cluster is missing (it's a single ground wire in the cluster connector). If that's the problem, a new cluster won't fix it. The dash harness ground is usually bolted to sheetmetal behind the dash with a ring terminal (on mine it's on the sheetmetal arch above the steering column). Any chance it was loosened and never put back?
It's also possible the ground connection into the cluster is missing (it's a single ground wire in the cluster connector). If that's the problem, a new cluster won't fix it. The dash harness ground is usually bolted to sheetmetal behind the dash with a ring terminal (on mine it's on the sheetmetal arch above the steering column). Any chance it was loosened and never put back?
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New User
Joined: Oct 2011
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From: small town Nebraska
The lights for the heater controls and for the light switch work. The headlights and turn signals work as well. Just not in the cluster. I took the meter and tested the connections going into the cluster and have power there with the lights turned on. Thats why im assuming its something with the cluster.
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