Have a 2001 S10 4.3 that has been having an electrical issue. It is affecting the windshield wipers, fuel gage, and the AC. Sometimes they work and sometimes they don't but they either all work or all don't. Wipers only work at slow speed. Replaced wiper motor twice cause mechanic didn't believe me! Alternator went bad recently and was replaced but issue still present. What could be causing my truck to act crazy?

sounds like might b a main fuse. do u have a kick panel and a box under the hood? sometimes a main relay or fuse will cause many electric things to go out.

You should start with you fuse block itself. For that many different things to be not working the one thing they have in common is the fuse box. if the fuses are good you may have a faulty fuse box itself. Use a voltmeter and test the slots to the fuses for each electrical item. If you dont have voltage going to your fuses then the box needs replacing. If you do then either fuses need replacing or damaged or broken wiring.

If they try to move the fuse is not the issue, You need to check the linkages, they are under the panel where the wiper spindles sit, the plastic ends can break and stop them working.

Windshield Wipers Not Working - Things to Check
To troubleshoot car windshield wiper problems, you need to thoroughly investigate problems with any of its operating parts. Here are some of the things that you need to check to determine why are your car windshield wipers not working.
Check Wiper Motor
The wiper motor is the driving force of the windshield wiper. Feel the motor and listen to a humming sound. If there is no humming, the motor is the problem. Check if the motor is working properly and see to it that its electrical connections are made properly. If you find that the motor is dead and beyond repair, get it replaced immediately.
Check For Break in Connecting Wires
The connecting wires of the motor sometimes go loose and that may cause the windshield wipers to stop working. Also check the battery plug connection which the motor has. Connecting the loose wires properly or fixing/replacing the plug might solve your problem.
Check Wiper Switch
Another wiper assembly part that can malfunction is the wiper switch itself. Check for switch malfunction and if you find that is indeed the problem, get it replaced from a mechanic.
Check for Bent Wiper Arms
Bent wiper arms can cause the operation of the wipers to be hampered. If the wiper arms are bent beyond repair, get them replaced immediately.
Check For Blown Out Car Fuse
A blown up car fuse could be the culprit that has stopped the windshield wipers from working. Check the fuse assembly under the dashboard of the car. Replacing a blown fuse might fix the problem of windshield wipers not working.
Windshield Wiper Sprayers Not Working - Things to Check
Sometimes the windshield wiper sprayer stops working which can be very annoying. The washer mechanism is a self cleaning mechanism for the windshield. Here are some of the things that you need to check in case it is not working.
Check Windshield Washer Motor
The windshield washer mechanism might have been impaired due to the malfunctioning of the wiper washer motor. Check if its working and get it replaced if it is beyond repair.
Check Windshield Washer Fluid Level
Sometimes the washer doesn't work because the washer fluid levels are not filled to requisite levels. Filling in fluid might restore normal functioning.
Check For Broken Washer Hose
The connecting washer hose that connects the reservoir to the nozzle, might be broken or worn out stalling the overall operation. Check the hose for leaks and get it replaced.
Check Washer Nozzle For Clogging
Last thing to check is the nozzle of the washer for clogging. An obstruction in the washer nozzle might be the reason for windshield wiper sprayers not working. Using a pin, clean the clogged nozzle. This might restore the sprayer to the normal working condition.

Might also be the nylon bushing cap on the steel arm. These break and let the linkage separate, causing the affected arm to disconnect. Look for the AC Delco 19120840 Windshield Washer Transmission Kit on Amazon or ebay.

Most likely a bad washer fluid pump.

the noise you heard in the rear was the electric fuel pump working but it sounds like you have an electrical issue check your wire harness for areas that wires chaffed on metal and cause break in the electric current some known areas are inbetween the radiator and the transmission down towards the tranny pan also check fuse panel might have a loose fuse

You need to check your Fuses.. It sounds like you blew a fuse that controls Those Items..

The most likely cause of your symptoms is the wiper motor parking relay has become faulty, however there is a slim possibility the connections within your wiper switch could be an issue, but the relay would be my first and cheepest line of enquiry. Contact your local VAG dealer and expect to pay somewhere in the region of £15. Good luck

These systems are controlled by the Generic Electronic Module (GEM), have a self test run on the system by Kragen, it is free, post codes here.