Need to erase keep alive memory then idle for at least 15 minutes
Without having a scan tool, you can disconnect the battery, and let sit for apx. 10 min., then reconnect.
defective alternator
If you are 100% sure nothing is on pulling power from the battery and it will not hold a charge then the battery has a dead cell and must be replaced.
There are a couple of a reasons why a 1994 Ford F150 truck will not start. The truck may have a dead battery or the spark plugs need to be replaced.
Starter Ignition Neutral switch
How do you remove and replace the battery on a 2001 Ford F150?
I believe you need to just start the engine with the key, it worked for me
battery need to be at lease 14 volts to be able to start
There are images available online to help you see where the Fuel reset switch on a 1986 Ford F150 is.
Did you attach the electric contacts to your starter? Do you have a good battery? Someone needs to check out your electrical system.
Locate the switch and press the reset button.
To reset the computer on a 1992 Ford F-150, disconnect the negative battery cable and leave it disconnected for about 10-15 minutes. This will clear any stored trouble codes and reset the engine control module (ECM). After the time has passed, reconnect the negative battery cable, and your computer will be reset. Make sure to check any radio presets or clock settings, as they will also be cleared.