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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

ignition problems '85 F250

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Old Jan 10, 2004 | 06:04 PM
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ignition problems '85 F250

i have an 85 f250 it is carborated and has the duraspark 2 ignition it will start and run as long as u hold the key in the start position as soon as u let it goto the run position it dies i have talked to the dealer and numerous bone yards and all they say is it could be a ground problem any help on this would be great
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blazer357

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have been useing a hynes manual and have done all testes and cant find problem ...................
 

Last edited by blazer357; Jan 10, 2004 at 06:07 PM.
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Old Jan 10, 2004 | 06:31 PM
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Years ago that used to be a resistor on the coil. Look around the coil for a broke part or bad connection. Also how about the oil pressure sensor or connection..I have all the books for my 85 f150 but its fuel inj.
 
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Old Jan 10, 2004 | 09:45 PM
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Try the switch thats under the column thats the Key Ignition switch is connected to. Usually the switch there goes bad.
 
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Old Jan 10, 2004 | 11:37 PM
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i have replaced the ignition switch on the column and also the coil.i have checked the wireing from the modual to the coil and distibutor the resistance is in normal specs as to hynes manual ....
 
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Old Jan 11, 2004 | 07:29 AM
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The Switch UNDER the column......
 
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Old Jan 11, 2004 | 12:51 PM
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is there another switch other then the ingition switch ? if so where id it located?
 
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Old Jan 11, 2004 | 01:03 PM
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Its under the column and is connected to the Key Ignition by a rod, Usually under the dash...on the top portion of the column and is very hard to get to...but useing an 5/16 in socket, it is easy to take off and replace. Go to the auto parts store and get one to see what it looks like....
 
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Old Jan 11, 2004 | 03:16 PM
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that is the switch i have already replaced any other ideas
 
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Old Jan 11, 2004 | 05:23 PM
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Change out the module itself, it's gone bad.
If you can, just find another old Ford one, they're considerably better than most aftermarket ones.
To test this, put a jumper between the two terminals of the 2 wire connector(red and white wires) at the box and plug it back in. It will now crank in the run position, so, have someone turn the key on, and pull the wire off if the solenoid when it starts. If it stays running, the run circut in your module is dead, if it doesn't, I don't know what to tell you.
 

Last edited by 82F100SWB; Jan 11, 2004 at 05:27 PM.
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Old Jan 11, 2004 | 06:17 PM
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Put a test light or voltmeter on the positive of the coil. When you turn the key to run, you should have 12 volts on the coil positive.
 
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