overdrive button not working? - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 01-12-2014, 07:53 AM Thread Starter
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overdrive button not working?

my 99 superduty wont come out of over drive, I think the button on the shifter is shorted out or something? How could I go about testing this? button pushes fine just doesn't show on the gauges that o/d is off. What exactly does that do anyway? think I read it just wont shift into 4th gear? thanks!
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post #2 of 6 Old 01-14-2014, 05:40 AM
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the o/d button will prevent it from going into higher gears, to test operation of the switch you need to bring your truck up to 55mph, let off the gas and hit the button, if you feel the engine slow the truck down it is functioning and your bulb is blown in your lever. If you feel no function you will need to pull the plastic cover off your column and test voltage to the switch, or replace the entire lever. Sometimes it is a simple fix of the wires that rubbed loose or broke, sometimes it is a faulty lever. If you need a replacement order dorman 905-109. Unless you want to go pay 80+$ from ford for oem. good luck
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post #3 of 6 Old 01-14-2014, 05:54 AM
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yep, prolly a shorted wire in the colum not uncommon

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post #4 of 6 Old 01-26-2014, 10:13 AM
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Mine came unplugged! Check to see if its unplugged or replace the switch

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post #5 of 6 Old 01-26-2014, 10:49 AM
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Here's a good link for how to check the OD wires, on a '99 it's fuse #19 Not #45 as later trucks but there a re great pics here to help.

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post #6 of 6 Old 01-26-2014, 07:54 PM
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99-03 OD wire fix

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