My version of an amp install - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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  #1  
Old 04-26-2008, 10:35 PM
chevtrlblzr's Avatar
chevtrlblzr chevtrlblzr is offline
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2005 Chevy TrailBlazer LT
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My version of an amp install

Lets start with running the wire from the battery. Maybe 8 gauge is enough, I used 4 gauge.
You’ll need an adapter (car parts or stereo shop) to hook up to.
Before

After

Then to a fuse holder.

To get the wire inside the truck, I went inside with a screwdriver and poked a hole through the trucks wiring harness boot, then when I fished the wire through – it was pretty tight – but I’ll probably silicone it too.

Lift the plates off at the front and back door sills and run the wire back to in under the back seat – then put a slice in the carpet and fish it to another slice where your amp is.





Now to the factory amp. Remove the passenger side rear plastic pieces. I don’t have pictures of that, just do it! If there isn’t a visible screw (one large torx for the seatbelt, a phillips partway back and a knob at the rear hatch), it’s just snap connectors – just pull them off.

The rear speaker wires are the lower plug. (for my 05 TB)
Brown – left rear+
Yellow – left rear-
Dark Blue – right rear+
Light Blue – right rear-

Tap into the wire by stripping a section of insulation off. Here’s the dark blue.

Solder and tape the connections. You can see I also tapped into the top plugs pink wire – it’s the remote turn-on wire for the amp.



Then run the speaker wires (the ones you just tapped into at the factory amp) to the amp you’re installing. My Rockford amp has hook-up for speaker level input so I’m using that (at least until I replace the head unit!) - (if you’re using a line-out-converter you’d wire it in somewhere between here and there). I ran them front and underneath the rear seat and with another slice’n fish under the carpet to the amp.

Then run your speaker wires (from your new amp) to your speakers.
You probably have to write the rest yourself – but I’ll show you what I did!
I ran them back under the carpet and up the corner post.



and a short one to my sub (everything REALLY needs cleaned up – oh well!)

Looking back.

Rock on!
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  #2  
Old 04-26-2008, 11:09 PM
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Right on!! That's way better than my amp installation how-to
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  #3  
Old 04-26-2008, 11:18 PM
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Looks good. I bet the sound is alot better back there, these trucks don't have that great of sound for rear passengers. By the way how deep iss that back pillar? I've been thinking of putting some 3.5" flush in that area
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Old 04-27-2008, 07:49 PM
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chevtrlblzr chevtrlblzr is offline
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EDIT
I'm not sure why I can edit this post but not the original but, I wanted to add;
A note on the install. The ground wire is just as important as the power wire. The best thing to do would be - drill a hole through the floor and ground it right to the frame. Don't just use any bolt to attach it. I looked at the seats and some bolts, you would have to count on;
1. you wire brushing the paint off and making a good connection.
2. that bracket goes to another bracket - through a hinge that you're counting on for a great connection (unlikely)
3. that bracket actually is bolted to another bracket - both painted and hindering a ground.
4. that last painted bracket is bolted to your painted floor which is attached by body mounts.
Yeah - it might be OK, but if there's problems, is it any wonder!


Quote:
Originally Posted by BLAZEN03 View Post
Looks good. I bet the sound is alot better back there, these trucks don't have that great of sound for rear passengers. By the way how deep iss that back pillar? I've been thinking of putting some 3.5" flush in that area
Thanks

Yeah, it sounds a lot better but the thump isn't quite what it should be. It's the same amp and sub from my last blazer but I had an after market head unit with 2 sets of RCA's - one for the rear speakers and one set specifically for a sub. I'm wondering if the factory HU is sending the full spectrum of sound to the rear speakers or if it is eliminating some of the lows. My amp has settings for front and rear - HP(high pass), AP(all pass), and LP(low pass). I have the 6 1/2's set at AP and the sub at LP. More tinkering needed!

As for room in the rear pillars, There's not much room between the plastic and metal - just guessing 1/2" - 1 inch. There's a (guessing) 2" x 4" slot in the metal at about the right height that could be enlarged if needed I suppose. Open your back hatch and grab the top plastic panel on the drivers side at the top rear - give it a tug toward the passenger side - there's 2 or 3 clips that'll let loose 'n ya can peek in there!
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  #5  
Old 04-27-2008, 09:50 PM
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sholiz sholiz is offline
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*Tip for everyone*

Careful how you run the wires behind the seats folding hardware ... there's a lot of moving parts there and a friend who put my seat up kinked an RCA when I installing the headunit
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  #6  
Old 04-28-2008, 08:50 PM
StephenS StephenS is offline
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Quote:
Originally Posted by sholiz View Post
*Tip for everyone*

Careful how you run the wires behind the seats folding hardware ... there's a lot of moving parts there and a friend who put my seat up kinked an RCA when I installing the headunit
When putting under the seat there is enough room to get them above the frame like I did
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  #7  
Old 04-28-2008, 09:32 PM
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Quote:
Originally Posted by sholiz View Post
*Tip for everyone*

Careful how you run the wires behind the seats folding hardware ... there's a lot of moving parts there and a friend who put my seat up kinked an RCA when I installing the headunit
Ya, Best Buy decided to put the RCA cable right in the way of the folding seats for me so my cable got kinked and eventually broke.
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  #8  
Old 04-28-2008, 09:42 PM
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sholiz sholiz is offline
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Quote:
Originally Posted by StephenS View Post
When putting under the seat there is enough room to get them above the frame like I did
Some people's approaches may not be as ... thorough?, just giving fair warning
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  #9  
Old 05-09-2008, 11:43 PM
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Sabiel1002 Sabiel1002 is offline
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nicee set upp
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  #10  
Old 05-19-2008, 05:56 PM
zelrob07gs zelrob07gs is offline
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I couldn't figure things out until I saw your pixs with the amp in the back! I have an 02Envoy and everythings pretty much the same except the remote turn on(no pink?). Do you know of any website that would tell me which one is the remote for my car?
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