Lights flickering ON 1994 CHEVY K1500. Just hooked an amplifier up and headlights are flickering @ night. The amp is not powerful @ all so I didnt think i needed a capacitor

You'll need to look for fuse number 13. If you want help locating it, follow the link: https://knigaproavto.ru/shemy/en/gmc/yukon/835-1992-1994-k1500-chevrolet-blazer-and-gmc-yukon-fuse-box-diagram.html

they said the alarm system has nothing to do with it? need more info and i can help.

When my headlights started to flicker at night, I soon found out it was the battery. It died one night sitting in a friend's driveway with the radio and headlights on. My battery was over 5 years old at the time, and the tow truck driver said I was lucky to have it work that long. I purchased a new battery and the lights no longer flicker at night. Just a suggestion. Hope this helps you.

It could be your spring on your emergency brake pedal is weak causing the light to go on or flicker.

The chirp is from scale or a glaze on one of the pulleys. If not black or shiney in color clean it with brake cleaner and spray some belt dressing on the pulleys

Check your fuel pressure, you should be around 50 psi. If this is ok, I would concentrate on the ignition;
Wires,plugs and ignition coil.

headlights are on a circuit breaker--not a fuse. so if you have a high amp draw situation--the breaker will get hot and turn the lights out then cool off and reconnect(a safety feature so you may have headlights a least part of the time). You need to look for reasons for a high draw. bad headlights themselves are the most popular cause as well as corroded connecters. Hope I helped

Fuse #8, #18 and #22.

Below is a listing of which fuse corresponds with which circuit:

1 - 10 Amp - Transmission Controller, Gauges, Autostick
2 - 10 Amp - Right High Beam Headlight
3 - 10 Amp - Left High Beam Headlight
4 - 10 Amp - Radio, CD Player
5 - 10 Amp - Washer Motor
6 - 15 Amp - Power Outlet
7 - 20 Amp - Tail, License, Parking, Illumination Lights, Instrument Cluster
8 - 10 Amp - Airbag
9 - 10 Amp - Turn Signal Lights, Turn Signal/Hazard Indicator
10 - 15 Amp - Right Low Beam
11 - 20 Amp - High Beam Relay, High Beam Indicator, High Beam Switch
12 - 15 Amp - Left Low Beam Headlight
13 - 10 Amp - Fuel Pump Relay, Power Train Control Module
14 - 10 Amp - Cluster, Day/Night Mirror,Sunroof, Overhead Console, Garage Door Opener, Body Control Module
15 - 10 Amp - Daytime Running Light Module (Canada)
16 - 20 Amp - Fog Light Indicator
17 - 10 Amp - ABS Control, Back Up Lights, Daytime Running Lights, A/C Heater Control Cavity Fuse Circuits
18 - 20 Amp - Power Amplifier, Horn
19 - 15 Amp - Overhead Console, Garage Door Opener, Trunk, Overhead, Rear Reading, and Visor Vanity Lights, Trunk Release Solenoid, Power Mirrors, Power Door Locks, Body Control Module, Aspirator Motor
20 - 20 Amp - Brake Lights
21 - 10 Amp - Leak Detection Pump, Low Rad Relay, High Rad Relay, A/C Clutch Relay
22 - 10 Amp - Airbag
23 - 30 Amp - Blower Motor, ATC Power Module
24 - 20 Amp - Power Window Motors
25 - 20 Amp - Power Door Lock Motors, Power Seats

This is a problem with all trucks what you need to do is get the dash or cluster out and get it repaired at gm they send it out and after a few days it will be returned functional

Check the wiring inside the headlight assy. I had a bad wire in a unit I installed. Once I tracked it down and repaired the wire all was fine.