This guide will walk you through installing a 5-ch amplifier setup in your Jeep Wrangler JL or Gladiator JT.

A detailed installation video is provided at the bottom of this guide to assist with the process. If you have any questions or need support during installation, we’re just a call away Monday–Friday, 9 AM–5 PM EST.

Before beginning, we suggest checking all parts and calling in or emailing if you are missing any parts for your system! We want to make sure you have everything to make the system work, below is a " What's In The Box" diagram pointing out all parts you will need for the install to work smoothly! "

Step 1: Remove Driver seat

• Use an T50 Torx to remove the four seat bolts. (Remove seat belt as well if needed_
  

• Tilt or fully remove both seats for easier access.

Step 2: Route Power and Ground Wires

Power Wire: Route the power wire from the battery through the firewall (driver-side footwell).

Ground Wires:

• 5-Channel Amp Ground: Use the factory ground point under the driver seat (near the transmission tunnel).

• Secure all ground connections tightly to avoid noise issues.

Step 3: Remove Radio & Access Signal Wiring

Factory Radio Installation (Using PAC Module)

If connecting to the factory radio, install the PAC AP4-CH42 module behind the glove box. Use the provided T-harness to connect the PAC module to the radio harness. If your Jeep isn’t factory amplified, make sure DIP switch #4 is DOWN (On Position) on the PAC module.

• Connecting the 9-wire harness: 
  
  • Connect the "bare-ends" or Ferrules to the Amp to the corresponding wires and channels
  • Connect the PAC proprietary plug into the T harness of the PAC AP4-CH41 that located behind the head unit. 
• Connecting the Bypass harness:
  • Connect the "bare-ends" or Ferrules to the Amp to the corresponding wires and channels
  • Unplug the harness plugs from your OEM amplifier, located behind the OBD2 port under the steering wheel, and connect the matching plugs from the Bypass harness to the plugs you removed from the Amplifier (there is one plug you will leave in the amplifier, due to canbus validation for the Jeep. 
• Connect the blue remote turn-on wire from the PAC module to the blue amp remote wire (pre-terminated with a bullet connector).

• Run RCA cables from the PAC module to both amplifiers:

• RCA's from PAC → routed to the 5-channel amp under the driver seat.

Step 4: Adjust Amplifier Settings

5-Channel Amp Settings:

• Gain: Start at 0, then increase gradually until you hear distortion, then back down slightly.
• Fader: On or pushed in
• Amp 1 x-over Freq: off or 7 o'clock
• Amp 2 x-over Freq: ~100 hx or 12 o'clock
• Input Level: Lo or pushed out
• Sub Input: Sub or pushed in
• Sub x-over Freq: ~80 hz or 11 o'clock
• Bass Boost: This is largely dependent of type of music you listen to. This activates the subwoofer in the event the music does not push enough bass you prefer. Be aware that bass boost does correlate with Gain as well, so if you push on the bass boost it's highly suggested to pull back on the gain in tandem. 
  We set this to about 1 o'clock. 

 

Section 3 - Test the system:

• Prior to installing all the trim pieces and the seat, you will want to test the system. You will need to set the radio into the place and install the connections at the bottom trim piece to power on the Jeep. 
• A good measure is to start with the amplifier adjustments as recommended above.
• Power on the Jeep and ensure that all speakers and the subwoofer (if installed), are reacting. Now is a good time to adjust the gain further if needed. 
  • Adjust all of the radio EQ settings to "0
  • Lower the radio volume to "0"
  • Lower all of the gains on the amp to "0"
  • Crossover adjustments can be set to just below half
  • Increase the volume on the radio to 75%
  • Increase the gain knob slowly until you hear a distortion from the speakers.
  • Slightly lower the gain knob and move on the next gain knob (if applicable)
  • You can now use the radio's EQ settings to add a little bit adjustments based on sound preference.
• Adjusting gain-
• Bolt seat down, secure radio, replace trim pieces, etc.

ENJOY YOUR NEW SYSTEM!!

Installation video by Trail Seven, to be used with the written instructions below:

2024 Amplifier Installation Video: 

2024 Speaker Installation Video: