No spark
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
What is the primary winding resistance compared to a standard Ford coil?
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
I believe I am losing spark. Originally started stalling while driving, then would restart on its own before I could pull off road. Now when it stalls I have to get to a stop, turn key to off and retry to start several times before starting. I carry a spare ICM in glove box for when it won't restart. Taken ICM to parts store and they tell me it is bad. Last one a Mortorcraft test good several times. My original motorcraft ICM test good half of the time. The intermittent loss of voltage or short to the ignition system must be knocking out the ICM. The truck ran fine all summer, it was a problem that has gotten worse since last winter. I have done resistance checks on all ignition wires and to ground while moving etc. I think my next step is to hot wire the ignition with a dash mounted switch.
If the coil is getting hot anytime the key is in the On position, this is my interpretation of your statements, then you have a path to ground that saturates the coil.
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New User
Joined: Jun 2014
Posts: 13
Likes: 0
I ran a wire from battery to coil and cut wire from ignition supply. Truck stalled less than two blocks from house. Noticed new coil running hot. Was looking at wiring in book instead of looking at ignition, noticed a radio interference capacitor from coil ignition wire to ground. I located and removed filter? Test drove truck for several miles with no stall problems. Returned coil warm but not hot. Removed wire to coil from battery and spliced wire from ignition supply. Test drove truck again, no problems so far. My guess is the radio interference capacitor, was shorting out to ground intermittently. I will try to use it tomorrow for work, wish me luck. I have spent $100's and many hours hunting down a *&%#!$ $10 part. Thanks everyone for your help. The Ghosttowner
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