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I have a 97 f150 (built 96 as 97 model), 4.2l 4x4, auto tranny. Here's the problem, when I turn my key forward to run position my starter kicks on and starts the truck, and stays engaged. I have a constant 14v at the signal wire on the starter relay (yellow red stripe). Also tranny started to slip, od light flashing. I replaced ignition lock cylinder, ignition/ starter switch, starter relay, starter, and today transmission range sensor (neutral safety switch 8 pin), same problem. Cel code that I had 2 days ago was P0707 tr sensor low input.
Your key hardware in 'RUN' operates a rod that moves a switch assembly to power the computer up for it's functions, first.
Advancing to start closes a path through the transmission sensor switch to the start solenoid on the fire wall for cranking, only in NEUTRAL and PARK.
You have an issue with the ignition switch operation.
It might involve a fault with the transmission switch sensor or may not.
Address the ignition switch operation first. If you find a fault with the ignition switch, address it, then see if you still get the code 707 and or things work as they should..
Good luck.
Truck only starts neutral and reverse as it should.
When replacing the ignition/starter switch ( on steering column) I did test the switch, and the starter comes on at the run position, and 14v stays constant at the starter relay.
Last night I did notice that when moving the shift lever the reverse lights randomly come on and off in all gears even park. Is there any sensors in the shift lever, or maybe I'll try to find a frayed wire
No its pretty much the same as its been for the 6 years I've owned it
Does the wires from the od switch affect the starting and shifting of the truck? I have continuity through the wires, mabey a wire is shorted out. Just seems odd that all of these problems started at basically the same time