The information on these pages is accurate to the best of the author's knowledge. The author can assume no responsibility for the use or misuse of this information by the reader. The reader is expected to secure any other information needed from Service Manuals or other sources. It is up to the reader to determine his/her ability to make any modifications noted. If the reader does not feel qualified he/she should enlist professional help
Chet's '02 AVALANCHE Pages

By Chet Walters
Click any picture to see enlargement Click any underlined words for more information or a link to a product.

Just about the first thing I did was change the speakers.  Pioneer 6-3/4" 240W 4-Way Car Speakers (Pair) TS-A1780R will fit into the EOM openings with a little bit of drilling.  Just remove the OEM's and set the Pioneers in the opening and drill some new holes into the door. Screw 'em on with the attractive grilles!  I also left the EOM tweeters installed and working as well.  Nice! Same speakers are installed in the rear doors, but to add the grilles, it's necessary to grind away some of the interior door panel (you can't see the grind, it's on the back of the door panel).  These look and sound just GREAT!  Here's some links ...

XM Roady 2! Pioneer DEH-P77DH!
XM Radio!  Greatest thing since canned beer!
I've got the Roady sitting in my ash tray with all the wires tucked down under the panel under the power plugs.  I've connected the Roady's power supply lighter socket to the hot wire for the AV's radio so that it comes on and off with the radio.  I did not want to permanently wire this because I take the Roady out from time to time to put into my GL1800 Gold Wing's pocket for XM on the road with my Wing.  When I had the OEM radio, the Roady played thru the AV's OEM radio using a GM9-AUX adapter from Precision Interface Electronics.  I now have installed a Pioneer DEH-P77DH head unit which fits right in the big DIN opening in the dash.  Color match is good and I input the XM with a PIE PIO/R-RCA adapter.  Output from the Pioneer feeds a Rockford Fosgate 200S PUNCH amp.  It's only 2 channel, but I feed all four speakers with it and it sounds excellent! 

XM Roady 2 in my Wing!


'02 EOM fog lamp switch REBORN!
Click any pic for a printable version

I really wanted the fog lamps to be on with the high beams from time to time and was tired of the GM habit of "forgetting" the lights were on last time I drove.  I decided to bypass the OEM system, but I did not want to eliminate the OEM switch.  Here, I put a Radio Shack 275-617 push button switch into the OEM box and filed off the original button plunger so it would strike and work that new switch.  I then substituted my own wiring harness and BOSCH relay to supply the OEM lights.  Now I can turn them on and off anytime I need them (off-roading especially).  

HOW TO: Take apart the switch box and insert the new switch by drilling out the area where the red return rubber was.  File a little off two sides of the switch so that the striker from the OEM button will be centered on the new switch.  File about 10mm off the OEM button plunger.  Carefully!  Leave the striker a little longer (like it was) and test often as you work so it's the proper length.  If you go too far, you can add some double stick to the top of the new switch.  It may be necessary to file a little around the top rim of the OEM plunger so it will go a little deeper into the dash or it may not work the switch fully.  File off the part of the OEM button that depresses the tang of the original circuit and put a little piece of tape between the contacts to disable the OEM circuit.

Tap the GRAY lead (D) from the parking lamps to feed the switch +12v when the lights are on.  Clip the PURPLE LED lead (B) and feed the OEM LED voltage from the output of your switch. Tape off the PURPLE that runs to the OEM harness (unused).  Run the output of your switch under the hood and use it to trigger a BOSCH relay to power the OEM lights.  Clip the PURPLE at each OEM light and substitute the output from your relay.  Fog lamps anytime the lights are on! (and it won't forget!)

FULL TIME DRLS (sorta kinda)
Click here for scrollable printable PIC1

Click here for scrollable printable PIC2

DRL's full time sorta kinda - used a Radio Shack 3 amp diode 276-1144 in an 18 gauge wire jumper from the parking lamp fuse "out" side to pin #87 on the DRL relay.  Diode white band faces the relay and the link is "fused" by the parking lamp's 10 amp.  '02 shown, but this should work on any later models too.  Just locate the parking fuse and pin 87 on the DRL relay (it's marked on the electrical center lid).  The DRL lights were filled with Sylvania 3357 ALL bulbs from Walmart (now with Silverstars).  These bulbs are a little darker amber than 3157's and more closely match the richness of the OEM parking lights.  Side markers were replaced with 194 A amber bulbs as well..  Shown with fog lamps on or off....

NOTE: this works on my son's '01 Silverado very well.


Click here for scrollable printable picture

Shown here on top is the quick way to have your high beams and low beams on both at the same time on an '02 Avalanche.  Just tap into the lo beam yellow (ground) wire and dump it to a convenient grounding post.  Illegal in all states!

Click here for scrollable printable drawing
Click here for scrollable printable pic of fuse block

Click here for scrollable printable relay connections

It's illegal in all states and most countries to have your HIGH's and LOW's lit up at the same time on the road.  But, say you want to use them off road, but would like to disable that on the road.  Here's a simple way to wire it up to use the dome override to enable or disable this feature.  Run a wire from your low beam ground wires ('02 is yellow) under the fuseblock into the cab.  Pop out your headlamp switch at the dash and wire in a Bosch style 5 pin relay as shown in the drawing.  Your choice as to what the dome override will do pressed in.

A) To have it ENABLE your HI+LO then run that ground wire from the 87 terminal.
B)  To have it DISABLE your HI+LO, run that ground wire from the 87a terminal.

Other wires shown are in your headlamp switch harness.  '02 Avalanche shown. Other models my vary.  Some relays require a small diode in the WHITE wire feed to the relay. 

Click here for a page on basic relay usage and why!


Click here for scrollable printable pic1
Click here for scrollable printable pic2

Though it did not like the Ohio Roads and salt, a Line of Fire was mounted on the tailgate with all the mounting hardware removed from the unit and 3m doublestick tape used (click for pic).  It's nearly invisible during the daylight and makes for a very neat appearance. To wire it, I did not want a buncha wires hanging all over the backside so I simply got a nice little $5 flat four trailer plug (female side) from Wally World and tapped into the main trailer harness (solder all connections and click here for the pin out). I added about four feet of wire so I've got a five foot flat four if I ever need one. The LOF simply plugs into it and all the excess wire is tucked up into the spare tire out of the way.

 The white lettering graphics kits were obtained from for the Avalanche and includes 4 sets of "Avalanche" for the cladding and the tailgate "Chevrolet" as a separate kit.

Click here for scrollable printable drawing
Click here for scrollable printable picture

Saw a great idea on the Avalanche Fan Club web site.  SabreXray made his back up lights into amber turn signals, but I modified his idea to preserve the back up light function as well using 4 Radio Shack 276-1144 3 amp diodes.  Takes about a half hour to do it this way, you just need two Tappits from Walmart, four diodes,  eight female bullet connectors and eight male bullet connectors.  See the drawing for the simple circuit and check the picture for how these wire up.  Note that the white band on the diodes point toward the backup light.  All the supply lines from the harness are FEMALE and all the connectors to the lights are MALE so this is easily reversible. Once you make all your connections ready and your diode joiner, it takes less than 5 minutes to install and remove.  Backup light bulbs are replaced with AMBER 3357 or 3157.

110 watts of BACK UP LIGHTS!
Click here for scrollable printable trailer harness diagram
Click here for scrollable printable wire diagram

Twin foglights added to trailer hitch area that come on with the reverse lights or "on demand" with the cargo lamp. I have them hooked up to come on only when the parking lights are lit, but you can wire them to come on anytime. No extra switches to install! See the drawing.  We work off the trailer plug harness and the cargo lamp ground.  See the pics above for them lit up!

NOTE: the OEM cargo lamp circuit is always hot and the cargo lamp switch completes the ground to light the cargo lamps.  Just work your way into the cargo lamps thru the side tool box and run a lead off the ground terminal of one of the lamps down thru your drains to your relay to work the cargo relay.

NOTE: if you leave on your interior lights or some such foolishness, GM will turn on your REVERSE lights for a set amount of time as a signal that something's wrong.  If you use the "on all the time" red wire option, this will also light up your rear fogs which may drain your battery.

Click here for scrollable printable PIC

Advance Auto Parts was running a sale, Silverstar signal lamps half off.  These lamps in amber have a richer more mellow tone than Wally World 3357a lamps when lit and they look really really good when turned off.  At regular price, they are not worth four times the cost, but on sale at just twice the price of regular, they are ok!  The pics show standard amber and Silverstar amber side by side (passenger side has them, driver's not).  The pic of the front does not really show how nice they look, but as soon as the snowstorm is over, I will try to get a better pic.  The reverse lamps show how much of a difference these make in appearance. I've also installed them on my wife's Magnum!

CHMSL strobe!

CENTER HIGH MOUNT STOP LIGHT STROBE! This works with the AVA original '02-05 neon and with the later model LED lights. I installed one of these in my motorcycle and my wife's 2010 Impala using a module obtained from SuperBriteLEDs (also available from other sources). I was poised to install one on my '02 AVA but the work necessary to access the wires in the cladding was daunting. Discouraged, I put the module on the shelf and pondered another way to do it. Then it struck me. The AVA (and most other vehicles) have a separate fuse dedicated to the CHMSL, what if I put the module into the fuse block in place of the fuse itself! Works great! Take a broken (or unused) fuse of the proper size and crack it in half so you end up with two separate legs sans the plastic. Solder the +12v feed of the module to one of them and the strobed output of the module to the other. Cut the red +12v feed line and put 2 female spade connectors between your feed wire leg and wire to the module. Insert the leg with a female into the feed side of the fuse in the block. Insert the strobe out leg to the other side of the fuse in the block. Insert the original fuse into the two female spades and loop the module's ground wire around the 85 (ground) terminal of one of the relays in the block. Arrange so it's neat and close the lid. Done! Neat!
PS: if it doesn't work, simply reverse the fuse legs because your polarity might be different for the fuse than the AVA.

Click here for scrollable printable PIC
Click here for scrollable printable wire diagram

Double set of air horns mounted on a homemade aluminum bar behind the bumper to supplement the stockers.  Use a Bosch style relay and trigger off the OEM horn hot wire.  LOUD!

Click here for a page on basic relay usage and why!

Click here for scrollable printable PIC

Grille and bowtie painted black with Duplicolor Truck & Van paint. Time spent - about an hour. Money spent - about six bucks!

Click here for scrollable printable PIC1

Click here for scrollable printable PIC2

Click here for scrollable printable PIC3

Need we say more!

Got a farm trailer for local hops.  

For longer hauls, I use the bigger rig. Twenty feet by Eight feet TimberWolf. Inside is modified as living space with a fridge, AC, inflatable bed and what not.  I can get most of my toys in there, haul 'em where I want, park the toys in a tent and live in the trailer.  Sorry, haven't written this one up yet tho.....

Click each pic for a larger view.

Click the pic for a how-to on changing the Cabin Filters on '02 and some '03 Avalanche 1500s.