Question about 1999 Ford Super Duty F 450

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My 79 ford 9000 dump truck has no power after the key switch is turned on..history ...it has been running....I went to start it and the batteries were low...I tried to boost it and something went click and then nothing would happen...I charged the batteries fully and now when I turn on the key there is no power to anything and the stater will not crank...I cannot find any blown fuses in the passenger dash panel...where should I look next? Thanks, Ben

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There is a solenoid mounted in the engine compartment, usually on the driver or passengers side on the inside of the fender that allows full battery current to reach the starter. Assuming the starter is good, you can test this terminal with a test light, there should be four connections on it. One is just a ground, some of them dont even have a ground, the unit is self grounded. The other small terminal on it is power from the accessory, or key (ignition) switch. Use a test light to check for power at this terminal. You should have no power when the key is off, and you should have full power (12 volts) when the key is turned all the way to start (as if you were cranking the vehicle). If this tests okay, try jumping across the other two terminals (they are both bigger than the first i described). One comes from the positive side of the battery, the other leads to the starter. Turn the key to the "on" position, and use a piece of heavy gauge wire to "jump" across the terminals. Caution: this is a bit hazardous, use good judgment, and be aware that leaving a wire on there could cause the wire to burn, or something to catch fire. All you want to do is tap the wire across, and see if the starter attempts to turn. Most likely, it will. You'll need to disconnect the batteries, and buy and install another solenoid. Just be sure the new one is connected as the old one is. Any other issues, please feel free to contact me back.

Thanks for asking!

Posted on Nov 13, 2009

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