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Old Feb 11, 2018 | 09:50 PM
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From: sedona az
Ignition issues

I am trying to get my truck back on the road
I just did a bunch of work including a new ignition switch and it was running good in till the starter solenoid failed I replaced it
now it will crank over and start but will die as soon as I let go of the key
 
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Old Feb 11, 2018 | 09:52 PM
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From: sedona az
1975 f250 highboy 390fe c6
 
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Old Feb 11, 2018 | 10:38 PM
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Might be a bad new ignition switch. How did the solenoid fail? Did it stick closed with the starter 'running away?'

Do you have a ground-strap wire from your engine block to the firewall of the cab?
 
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Old Feb 11, 2018 | 10:56 PM
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From: sedona az
Originally Posted by meangreen92
Might be a bad new ignition switch. How did the solenoid fail? Did it stick closed with the starter 'running away?'

Do you have a ground-strap wire from your engine block to the firewall of the cab?
it ran fine after installing switch
the selonid stopped sending power to the starter
I have a ground wire from the block to cab and an extra from starter to frame
 
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Old Feb 12, 2018 | 07:05 AM
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Do you have a good test light? Simple to trace out circuits with and an exercise in frustration without. 2 feeds to the coil+, one is full 12 volts from the starter relay during cranking and the other is the "run" position through the resistor wire from the switch. It sounds like you have lost power through the "run" circuit.
 
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Old Feb 12, 2018 | 02:56 PM
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From: sedona az
Originally Posted by willowbilly3
Do you have a good test light? Simple to trace out circuits with and an exercise in frustration without. 2 feeds to the coil+, one is full 12 volts from the starter relay during cranking and the other is the "run" position through the resistor wire from the switch. It sounds like you have lost power through the "run" circuit.
I will try to do some tests when I get home from work tonight (weather permitting)
Does anyone have a wiring diagram of this circuit
I am wondering if some of the wiring repairs the PO did failed,
 
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Old Feb 13, 2018 | 02:25 PM
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From: sedona az
I am getting 12v to the coil with engine off key on
 
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Old Feb 13, 2018 | 05:36 PM
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From: sedona az
I'm leaning to ignition module failed
 
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Old Feb 14, 2018 | 12:35 PM
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From: sedona az
Problem found wire broke off at back of ignition switch connector
now to figure out how to fix it
 
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Old Feb 14, 2018 | 10:04 PM
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From: sedona az
Thanks for the ideas problem temporally fixed
I need to find the part number for the connector that plugs into the ignition switch

Now I seem to have developed a wiring problem somewhat in the dash I have smoke coming out of the dash when the ignition is on ( battery is currently disconnected in till I take the dash apart)
 
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