No lights on dash when trying to start, also it wont start.we replace the transmission neutral switch

Which part of ignition switch did you replace ? The key an lock cylinder or the electrical part behind the lock cylinder ? What year ,make an model vehicle do you have ? Most all newer vehicles from 1996 on have anti-theft systems . Is there a security light lit on your dash ? These same vehicles have a starter relay in the under hood fuse box that is turned on or energized by the PCM/ECM - engine computer . The switch the mechanic told you about is the transmission range selector or park neutral safety switch. Your best bet , rather then replacing parts is to take it to a ASE certified repair facility .

• Neutral safety switch sends a signal to the on-board computer to allow the engine to start and to engage the transmission
• When not replaced, vehicle may experience no start and/or transmission will not shift out of park.

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Do the brake lights work? If so, try turning ignition to on, no dash lights, and not to start and shifting to neutral then try to start it. If this allows it to start in neutral. Then it is the Transmission brake safety switch. If the brake lights don't work it's the brake light switch.

Automatic or manual transmission ? tumbler sends voltage ??? What tumbler ? Ignition switch ,when it start position sends B+ voltage to the crank fuse in the insturment panel fuse box ,from there it goes transmission range switch,if in park or neutral it then goes through the relay pin 86 at the relay socket base . With the key in start you should see B+ voltage there . If not ,try moving the gear selector to neutral . if you still don't see B+ voltage , find the trans .range switch an check it.

look under truck at transmission selector cable if it disconnected [because of rust ] or damaged --the lever may be in park but the selector at transmission is in gear wont start big problem with gm trucks burbs replaced may friends 05 silverado and had to do same for my 08 yukon

No start (engine doesn't crank with starter motor) in neutral and park position, one or both

Power runs from battey to starter solenoid , from there to ignition switch and through neutral switch on the transmission shift lever. Tracking down shorts is easiest if you connect a 12v test light across the fuse clips and start disconnecting wires one at a time until the light goes out. But in your case I think a physical exam of the wires to the neutral switch may reveal your problem Good luck!

May be neutral safety switch, put into neutral and try to start. If that works have switch replaced its on the transmission. Even if it starts that way it wont take long before the car wont turn over in that position.

try unplugging the neutral safty switch on the transmission

Sound like it might be the neutral safety switch solenoid going bad or sticking. This switch opens (denies current to) the starter circuit when the transmission is in any gear but Neutral or Park on automatic transmissions.If you find that you have to move the shifter away from park or neutral to get the car to start, it usually means that this switch needs adjustment.