Not sure I follow you. Are you going to rewire the key switch power source back to the starter post ?
And the truck is actually a 1968 instead of a 1986 ?
Testimonial: "Yes it is a 68, and I am trying to get things staightened out so it is correct. someone else had jumped from the alternator to the pink wire at the switch. I have power on the red andwhen Iturn the key I have it on the pink and very little on the purple."
SOURCE: No-start condition, starter & ign switch ok
yes the park neutral sounds like where your problem is
you could use a test light to check .
SOURCE: no fuel no spark 1990 k5 blazer 350
Take off the distributor cap. Check the star wheel that is splined to the distributor shaft that the pick-up coil uses. Make sure this wheel is not loose on the distributor shaft. It is right above the pick-up. If it is loose, replace the distributor. This is a common problem. If it needs one, all the part stores stock the distributor.
SOURCE: 350 Chevy starter wiring diagram needed
IF YOU HAVE A POINTS TYPE DISTRIBUTER, THE WIRING WILL BE: TO ENERGIZE THE STARTER SOLENOID A LARGE, ABOUT A NUMBER 12 OR 14 GAUGE WIRE WILL GO TO THE INNER MOST SMALL TERMINAL ON THE STARTER SOLENOID. IT MAY BE PURPLE IN COLOR. THE SECOND SMALLER WIRE SHOULD GO TO THE OUTER SOLENOID TERMINAL AND GO FROM THERE TO THE + TERMINAL ON THE IGNITION COIL. THIS IS FOR BY PASSING THE RESISTOR WIRE FROM THE STARTER IGNITION SWITCH. THE LARGER BATTERY CABLE WILL GO TO THE UPPER TERMINAL ON THE STARTER SOLENOID. THERE MAY BE AN ADDITIONAL BATTERY FEED WIRE TAKE OFF FROM THE STARTER BATTERY TERMINAL POST ON THE SOLENOID FOR OTHER ACCESSORIES. THIS TYPE OF SYSTEM (POINTS TYPE) WAS TYPICALLY DONE AWAY WITH IN 1975 WHEN THE HEI DISTRIBUTOR CAME OUT.
SOURCE: 1997 chevy blazer key stuck in ignition AGAIN GRRRRRRR
I have worked on several vehicles with this same problem and each one was a relatively simple repair with no parts involved, first off the shift interlock has nothing to do with it and will not prevent your vehicle from going into park, it is designed to work ONLY when coming out of park. The problem your having depends on the type of shifter handle your vehicle has, if the release lever is on the bottom and you have to push up with your fingers to release it, then the problem is...there is a rubber type cover that surrounds the release button, after time it becomes distorted and bunches up preventing the shifter from fully engaging in the park position (even though it appears the vehicle is going into park)if your careful you can work the rubber cover out and your problem is fixed. If your shifter button is on the side and pressed with your thumb the cable needs to be adjusted, this cables only purpose is to prevent key removal except when in park and is easily adjusted, with the center council removed, if you look at the front of the shifter base you will see 2 cables that snap into the shifter frame, the larger one is the gear selector cable, the smaller one runs up to the steering column and operates the mechanism that prevents key removal, where the cable snaps into the shifter frame is where the adjustment is done and is identical to a kick-down cable used on older vehicles with automatic transmissions, right where it snaps into the frame there will be a button you can press down releasing a spring loaded adjustment arm, make sure you first mark the arm for reference then press down the button and adjust it a little either way until it functions properly, hope this helps and good luck
2
Inspect
Coil - Ignition
Damaged or faulty ignition coil or ignition coil circuit.
3
Inspect
Fuel Filter
Clogged or dirty fuel filter
4
Inspect
Fuel Injector Pressure Regulator
Faulty fuel injector pressure regulator or circuit.
5
Inspect
Fuel Pump
Improperly functioning fuel pump or circuits.
6
Inspect
Wireset
Damaged, worn, or deteriorating spark plug or coil wire(s).
7
Inspect
Control Module-Ignition
Faulty ignition control module or circuit.
8
Inspect
Solenoid Switch
Damaged or faulty solenoid switch or solenoid switch circuit.
9
Inspect
Starter
Damaged, worn, defective, or faulty starter or starter related circuit.
10
Inspect
Neutral Safety Switch
Damaged or faulty neutral safety swittch or circuit.
11
Inspect
Fuse
Corroded, burned, or shorted fuse may be interupting power source.
12
Inspect
Fusible Link
Corroded, burned, or shorted fusible link may be interupting power source.
13
Inspect
Battery Cable
Corroded, broken or poorly connected battery cable.
14
Inspect
Spark Plug Wire Loom - Performance
Improperly adjusted or worn/malfunctioning carburetor.
15
Inspect
Distributor Cap
Loose or cracked distributor cap
16
Inspect
Distributor Cap And Rotor Kit
Loose, cracked, or worn distributor cap and ignition rotor.
17
Inspect
Fuel System Pressure
Incorrect fuel pressure being delivered to carburetor or fuel injection system.
18
Inspect
Fuel Injector
Plugged, dirty or poorly connected fuel injector.
19
Inspect
Ignition Switch
Worn, damaged or faulty ignition switch or circuit.
20
Inspect
Spark Plug
Fouled, damaged or broken spark plug(s).
21
Inspect
Belt
Incorrectly routed, adjusted(tensioned), missing or worn drive belt(s).
22
Inspect
Timing Belt
Slipped or broken timing belt.
23
Inspect
Timing Set
Slipped timing chain or worn timing gear(s).
24
Inspect
Fuel Tank
Contaminated fuel from rusted or deteriorated fuel tank.
25
Inspect
Ignition Timing
Incorrectly adjusted engine timing.
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