Celloid went out

Oh boy, I just went through this with my '92 Lesabre, took a long time to trace it all down, and wound up splicing in a new wire just to my instrument cluster lights. A short kept blowing fuses somewhere in that circuit.
Down where your feet go, up under the dash at the fuse panel, there is a 15 amp fuse for park/tail lights. When you hit the light switch (for heads or park lights), power is sent to that fuse, and then to the exterior park lights. There is another wire from that fuse (green wire on mine) that also goes up under the dash, and splices to several bulbs-on the radio, on the HVAC controller, on the ashtray light, also one to the under hood lamp, and then one to the dimmer/brighter switch on the dash, the rheostat that controls brightness of interior lights. One of the green splices goes into this switch, and then another wire goes from this switch to the instrument cluster for the gauge and dash illumination. I couldn't find the short, so ran a new wire from the park light fuse to the gray wire to the instrument cluster for the cluster bulbs. I bypassed the dimmer, and left off the HVAC bulbs and ashtray light. Too much trouble to wire them all up, and think my short may have been in the dimmer rheostat.
If you have a voltmeter, pull out the dimmer switch and check for power on those wires, the green from the fuse. The park light must be switched on, or the fuse has no power. There be 8 or 9 wires on that dimmer rheostat-I never did figure out where all of them went. Asked all over a Buick forum, but nobody had an answer.

Dry out your distributor and rotor. Also check the distributor to coil wire.

Both red wires go to the bigger post on the starter. The purple goes to the small post. There should be 2 big post, make sure the red wires go to the one that has nothing else on it cause the other is the ground.

IAT sensor only has 2 wires ,intake air temp. Maf sensor has 6, mass air flow

It runs through at least one relay. Maybe instead of trying to track wiring down yourself, you could do what I used to do. I went to a local "you-pull-it" wrecking yard and found a car like mine. I looked at that one to figure out how to fix mine. You could go find THAT ignition wire and it would help you locate where yours should be. You might want to pick up some used parts while you're there.

Below is a picture that should help.

The wire from the battery goes on one of the large posts, the wire to the starter goes on the other large post, as well as any accessory wires. Usually there is only one or two that go on that side. The small wire goes on the very small stud. If there are two very small studs, use one, and if it doesn't crank, use the other. One is used for another purpose.

Opening the trunk with the key (not the valet key) will shut off the alarm.

Can't offer help on permanently disabling the alarm.

Try your local library for diagrams and pictures of both engines and that way you can figure out how the wiring goes

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