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There are several things that can cause your brake light fuse to blow and keep your 1994 Ford F3 50 locked in park. The most common cause is a malfunctioning neutral safety switch.
Possibly there is a short in the wiring somewhere or the incorrect amp fuse is being used. Also, the switch itself may be faulty.
When I changed my shifter in my 74 camaro I had a similar problem with the battery dying. I later found out that it was because my neutral safety switch was going bad. so what i did was bypass my neutral safety switch by taking it off and just keeping it in the park position but that made the problem worse so what i did was take the n/s switch that came with my shifter and ran two wires from the n/s (RED And PURPLE WHIRES) which is the park position under the carpet to the n/s for the console and i havnt had a problem. or what you can do is disconnect the green and purple wires and ru a jumper wire between them to see if that will work.
the relay switch maybe stickin
I have a chrysler and i have to constantly have to replace the 20amp fuse to start the car why.
worn ignition switch
blow fuse, bad motor, bad switch or wiring
You have bad ground in the switch
computer fuse blow out when turn ighition on what is the cause
A bad resistor or a bad switch.
Live, neutral and earth. The supply is carried on the live and neutral, and the earth normally carries no current, but if there is a fault the earth is there as a safety factor and in some conditions it carries enough current to blow the fuse and make the circuit safe.
cause of excessive blow- by