Question about 1989 Ford F 250
This may sound crazy to you. Check the fuse that controls the speedometer, cruise control and interior dome light. My 93 f150 battery was going dead every night. One morning I noticed the dome light inside was still on. I couldn't get it to go off so I pulled the fuse that is under the dash on the driver side. Light went out and so did speedometer. When I drove it later that day it wouldn't shift from low until I let off the gas. Then it would shift around between gears for no apparent reason. It took me a day of two to put 2 and 2 together. When I put the fuse back in, the speedometer started working and it started shifting normally. I finally took the bulb out of the dome light and now all is well.On the 93 f150 the speedometer is electronically linked to the transmission shifting points. You may have other fuses that are linked to your transmission.
Posted on Sep 12, 2010
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Posted on Jan 02, 2017
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