New stereo replacement

I recently purchased my first Toyota it's a 2005 tundra.
I love the truck. I purchased a new stereo for it trying to wire it up how do i use the factory amplifier please help me.
Thank you

 

We need more info to help. Regular, access or double cab? JBL or non-JBL sound system?

 

Double cab JBL system amp is behind the drive rear seat

 

The OEM amps are pretty weak. You'd be better off bypassing it and using the onboard amp on a new head unit.

You'd need the harness to adapt the radio and a second one the bypass the amp.

 

How can you do it with out the harness is it possible

 

If you want to cut and splice directly, you can skip needing the harness.

The harness is relatively cheap and is much easier than DIY. Unless you already have 6-7 feet of 8 different wire colors to make your own.

IIRC the 05/06 OEM wiring diagrams are linked on this site if you search.

 

Where does the harness wire it I purchased a metra 70-8113 will it work

 

That will provide power to the radio.

I don't know if the RCA output of an aftermarket radio will be enough or too much signal for the JBL amp. Someone else will have to chime in.


Or you could wire it and plug it into try it.

 

I had to search metra 70-8113 to see what you were talking about.

The first video search result that came up is this:
https://www.youtube.com/watch?v=fnW54TBWAtA

 

According to Crutchfield, who will make the cable for you, provide instructions, shows that Metra 70-8117 Amp Bypass is whats needed for your year/body Truck with JBL system presently.

Metra 70-8117 Amp Bypass Harness Connect a new car stereo and bypass the factory amplifier in select 2003-07 Toyota vehicles at Crutchfield