Question about 1987 Ford Thunderbird

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On a 1987 thunderbird basic with a digital speedo and analogue gauges there is a short to the digital speedo display all gauges work but not the speedo. The issue is I have found a working cluster but on the old cluster I can not find the cause of the short and before I plug-in the new cluster I would like to know the reason for the short. Now for the question: The system includes Speed sensor, computer then the cluster and work in that order correct? The gages work, the cruse control works and the car runs fine just 2 traces on the cluster going to the digital speedo are fried. Is it possible for the computer to have a short that would cause the cluster to fry? or Is it also possible for the sensor to have a short that would cause the cluster to fry? Is there a direct connection between the sensor and the cluster or is the connection between the sensor and the cluster the cars computer?

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Posted on Jan 02, 2017

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SOURCE: Gauges, Power Windows, Auto Lamps radio interior lights dont work

Sounds like an ignition switch problem, maybe even at the key.

Posted on Feb 21, 2009

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SOURCE: 88 ford thunderbird the alternator shorted to

Had the same problem. Likely the fusible links. Get a Haynes manual with wiring diagram in the back (should be around $15 or so at an auto parts store). I also had to replace the air intake duct and several components of the thermactor air system. One other thought is that the new alternator is not putting out a charge, you might want to check that if you believe everything else is okay. I once replaced an alternator and the new alternator was defective. --Mark

Posted on Jun 14, 2009

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SOURCE: speedometer, odometer, cruse control & tranny overstopped working

If it has antilock brakes, the sensor is on the top of the rear differential. This sensor usually drives the speedometer. check the sensor for an open in its windings and also the wire that connects to it for any breaks.

Posted on Sep 28, 2009

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SOURCE: Cluster lights blowing fuses - Temp gauge stopped working

try changing the headlight switch,I had a similar problem only mine happened after I accidentaly short out when I was replacing the horn pad and for some reason when I replaced the headlight switch the problem went away.

Posted on Oct 06, 2009

  • 1 Answer

SOURCE: engine warning light , battery light, warning

My 04 Ford Focus the battery light keeps coming on & going off, have fitted a new alternator belt but it didn't solve the problem. The battery connections are good. Also the rev counter, speedo & mileage clock keep going haywire when the battery light is on. Do you think it is the alternator? Or is it some other common problem?

Posted on Mar 18, 2010

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