Great deals on TJ parts on Amazon!

Looking for parts for your Jeep Wrangler TJ? Checkout the selection of TJ parts Amazon has to offer, many with 2-day Prime shipping!

Click the image below to browse TJ parts on Amazon.

Jeep Wrangler TJ Parts on Amazon

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.

Help with stereo wiring and amp

Necro

TJ Enthusiast
Supporting Member
Joined
Jun 22, 2022
Messages
165
Location
Norfolk Virginia
So I took the dash apart further. The yellow wire does go to a sirus receiver mounted under the steering wheel. The way it is currently wired with the amp should technically work as all is powered by the red accessory wire. The red accessory wire had 2 volts even when no key, 12volts with key. Is it supposed to have current all the time?
Is there a different wire I could tie the blue amp remote wire into ? Could the problem be the amp itself sending current back through the remote wire? I feel like when the amp is hooked up and voltage goes back through the remote wire it is somehow activating the red accessory wire as well as the stereo. That might explain the clicking I hear in the key area. It also supplies constant power to the stereo allowing it to operate sans keys

That's kind of how it sounds just from listening to you describe everything. The only way I could tell would be to get my multimeter in there for myself. Here's where I would start to trouble shoot it. Unplug all of the aftermarket wiring from the factory wiring harnesses, then meter the wires in the factory plug that are supposed to be the red and yellow wires in the aftermarket wiring. See if the 2 volts disappears. That will tell you if it's the factory wiring or the aftermarket supplying the suspicious voltage.
 
OP
B

Baddy McBadface

New Member
Joined
Nov 21, 2022
Messages
10
Location
Pennsylvania
That's kind of how it sounds just from listening to you describe everything. The only way I could tell would be to get my multimeter in there for myself. Here's where I would start to trouble shoot it. Unplug all of the aftermarket wiring from the factory wiring harnesses, then meter the wires in the factory plug that are supposed to be the red and yellow wires in the aftermarket wiring. See if the 2 volts disappears. That will tell you if it's the factory wiring or the aftermarket supplying the suspicious voltage.

That was a great idea. I just metered the factory side and the first/yellow is 12v. The second/red accessory is 0 volts. So it is the amp feeding current back to the red accessory wire causing all the problems. Now the question is this an amp problem or a wiring problem since the stereo doesn’t seem to have a blue wire remote?
 

Necro

TJ Enthusiast
Supporting Member
Joined
Jun 22, 2022
Messages
165
Location
Norfolk Virginia
That was a great idea. I just metered the factory side and the first/yellow is 12v. The second/red accessory is 0 volts. So it is the amp feeding current back to the red accessory wire causing all the problems. Now the question is this an amp problem or a wiring problem since the stereo doesn’t seem to have a blue wire remote?

Now go back to the amplifier, disconnect the remote turn on wire, but leave the positive and ground connected, and then meter the amplifer on the remote turn on terminal and see if the amp is backfeeding voltage.
 
OP
B

Baddy McBadface

New Member
Joined
Nov 21, 2022
Messages
10
Location
Pennsylvania
Now go back to the amplifier, disconnect the remote turn on wire, but leave the positive and ground connected, and then meter the amplifer on the remote turn on terminal and see if the amp is backfeeding voltage.

So here’s the results. The 2 ish volts I’ve been detecting from the red accessory wire group slowly draws down to zero volts over a period of 5 minutes or so. When metering the amp with the red and blue attached I get 12v on the red and 7 ish on the blue terminal. Removing the blue wire and the blue terminal reads 12 volts. The only time the blue wire reads 12 volts is when key is on. Something is wacky.
 

Necro

TJ Enthusiast
Supporting Member
Joined
Jun 22, 2022
Messages
165
Location
Norfolk Virginia
So here’s the results. The 2 ish volts I’ve been detecting from the red accessory wire group slowly draws down to zero volts over a period of 5 minutes or so. When metering the amp with the red and blue attached I get 12v on the red and 7 ish on the blue terminal. Removing the blue wire and the blue terminal reads 12 volts. The only time the blue wire reads 12 volts is when key is on. Something is wacky.

You did too many things at the same time for me to help you remotely. Sticking with just the amplifier, what color are the positive and ground wires going to the amplifier? Some use red and black, and some use Blue for the hot lead. Sometimes I've seen blue and silver. Not knowing which red, which blue, what end of the Jeep you're on, or how many different things are connected into the ckt makes it impossible to help you troubleshoot from where I am.

So back to the amplifier, don't worry about the speaker wires for now, and just worry about the power, ground, and remote turn on lead. Check the ground wire at the amplifier to a good solid ground in the Jeep, a seat belt bolt usually works well. On the OHM setting, how many ohms? On the DC voltage setting is it showing any voltage? Disconnect the remote turn on lead from the amplifier, and then read the voltage on the 12 volt positive wire at the amplifier. Lastly, ground the black probe of your meter, and probe the terminal on the amplifer where you just disconnected the remote turn on lead, with the red probe, with the meter set to DC voltage and see if the turn on terminal is outputting any voltage?