The backup light switch for a 1980 Ford E-150 van is typically located on the transmission. It is usually mounted on the side of the transmission case, near the shift linkage. This switch activates the backup lights when the transmission is in the reverse position. If you're having trouble locating it, consulting the vehicle's service manual can provide detailed diagrams and information.
On my 1990 Ford E150 4.9L I6, the neutral switch is below the steering wheel, half way down the steering column, on the top side of the steering column. Just keep unscrewing things until you can access the switch, then remove the switch.
more than likely in steering column
There should be a foot switch to the left of the gas pedal.
Passenger side lower kick panel
the fuse is in the dash behind the overdrive switch
If the Third brake light is the only one working , it sounds like the multi function switch...aka turn signal switch...Just had the same problem with my 98 cargo van..
On a 1989 Ford E150, the ignition switch is typically located on the steering column, beneath the dashboard. To access it, you may need to remove the lower steering column cover. The ignition switch is connected to the ignition lock cylinder and is responsible for powering the electrical systems when the key is turned.
diagram of a 1995 ford E150 econ line solenoid switch
In the front passenger footwell behind the kick panel
Check the TPS
Flat battery, neutral safety switch, starter realy poor battery connections.
Lot of smarts in that psointg!