2004 Chevrolet TrailBlazer - Page 2 - Answered Questions & Fixed issues

This should help

check battery connections and main fuse

It located behind the lower left side of dash.

I would start with the checking the bulbs, fuses, then check the switch.

Have you tried to add any refrigerant to it lately? The pressure can go up as it heats up, to the point where the pressure switch cuts the compressor off.

May be some wiring fault but to know the exact fault you must need the service and repair manual with diagram which will provide you step by step help to locate and fix the problem easily and you will get the manual from the given link https://toolsnyou.com

Try right above your oil filter if it not there look on the front of the engine it's called a oil pressure switch

The 2004 Trailblazer has two fuse panels, one in the under hood and one under the middle row seats. The radio fuse is marked RADIO fuse # 41 and is a 15 amp fuse located in the rear fuse panel. To access the rear fuse panel flip the seat behind the driver to the upright position, under it you can see the fuse panel and a diagram should be on the under side of the cover. 

Good luck and hope this helps.

I disconnected the battery, removed fuses 10 and 28 adjacent the battery and waited twenty minutes. I then hooked the battery back up reinstalled the fuses and started the vehicle. The battery light went out and the battery not charging message did not come back on. I then went for a test drive. I had a celebratory adult beverage because it worked.

Torque should be about 30-40 ft lbs. This is essentially tight by hand, no torque wrench is often used. See this how to video: Sorry the video wouldn't upload. But the shop (A1 Auto) tightened by hand and for me that's 30-40 ft lbs with open end wrenches.

Check the idle air control device on the intake

Check out this video on the pugre valve location. https://www.youtube.com/watch?v=qwMn0-UEgLo

How to remuve2005 trailblazer remove rear bumpier cover

You probably have a front drive splined disconnect assembly that has gone bad. This assembly engages the front differential when 4WD is selected. Below is a figure of the item, it is on the passenger side of the differential area.

If you have the two ends of the wires then they will have the same colors and you will have to put them back together. add new piece of wire if needed and make sure that they are secure. you can use plastic insulated connectors or solder them back together and use shrink tube to weather proof, soldering is the best way for a good connection to any wiring job.

There is no low beam fuse.

Not legally. If you do it illegally, you'll get a check engine light on full time.

2004 trailblazer the secondary air system under the battery box

This sounds like the A/C switch got really hot at one point and melted the coating off some wires close to it and they've fused together. You'll have to pull the A/C switch to find out, there's no being able to see under the dash without pulling a lot of stuff out to get to it.