Chevy S-10
Car Stalling Problems
Ford F-250

Why will a 1977 ford f-250 start but not run when key is released new ingition disabled antitheft still won't stay running?


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Try this

Just a thought but on the 77 there should be a starter solenoid on the passenger side fender and the power wire for the coil is attached to one of the small terminals, it should be on the side closest to the battery i think. The other side only supplies power when engaging the starter and that might be why it only runs when the starter is going. It could also be bad and not supplying power to the coil when needed you can test this by using a jumper wire to connect it to the hot side of the solenoid and starting the truck ( that's also how you hotwire one of those old ones).