ignition problem??/
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Trailering
Joined: Feb 2011
Posts: 17
Likes: 0
ignition problem??/
i have a 56 ford f100 with manual tranny. my truck will only run if the key is held in the start position. once i let go of the key the truck dies. I have replaced the ignition siwtch and ignition cylinder. Any ideas?/
Laughing Gas
Joined: Nov 2008
Posts: 914
Likes: 51
From: SW Missouri
Check and see if you have a ceramic resister to reduce voltage. If your ignition has one and is wired correctly the voltage bypasses it when the ignition is turned to start and goes back through the resister when the key is release. If that resister goes bad it will run in start but not in the run position. You can double check by temp. running a jumper wire across the two resister post and it should run.
Hope that's your issue, if so replacing the resister is a cheap easy fix.
Larry
Hope that's your issue, if so replacing the resister is a cheap easy fix.
Larry
Elder User
Joined: May 2006
Posts: 907
Likes: 1
From: Kansas City, Mo
I think you may be missing the wire from "I" on the start relay to the resistor prior to the ignition coil. As a test you could jumper a wire from the + side of the battery to the resistor prior to the ignition coil. This is with the ign switch to start then release to on/run/normal position. Don't leave the test wire on to long. You may have broken the original wire on either end by accident. chuck
What Larry said also.
What Larry said also.
Last edited by 49fordpickumup; Feb 23, 2011 at 09:41 PM. Reason: addition
Lead Driver
Joined: Aug 2006
Posts: 8,093
Likes: 652
From: Brentwood, TN
The stock location for the ballast resistor is the firewall, if you follow the wires from the coil you'll find it. One side of the coil has only one wire...it goes to the distributor. The other terminal of the coil should have two wires...one to the starter solenoid and the other to the ballast resistor. Here is a photo of a ballast resistor for reference. It is about 3 inches long and about 1 inch on a side.
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