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The lighting system of all 80's fords speedometer is an independent circuit of the speedometer itself. When there is no display, one of 2 things could happen: 1-.The power line of the speedometer is damaged. Normally they have a kind of ribbon cable with cooper bands connecting between the panel, the 12V source and the sensor. Please check the ribbon cable if it doesn't have any gap in the cooper lines. 2.-Perhaps the 12V speedometer's internal regulator is damaged, you have to check if it is replaceable, if it isn

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โˆ™ 2005-01-22 21:08:45
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Q: Why would a 1987 Ford Aerostar 3.0L digital speedometer light up but have no display?
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