Kicker Key 200.4 Install in 2024 Lariat w/ B&O

[colinl]

btw if you buy a t-harness for use with a key 200.4 that has power and ground in the harness, DO NOT use those connections. instead, you need to install wire positive to the battery (I would do at least 8 gauge), and create a new ground very near the amp by using steel wool to remove a dime-sized spot of paint, and a sheet metal screw through a ring terminal.

I don't know who is making harnesses like that but I saw a FB post a few days ago where someone was complaining of noise with their Key 200.4 in a Bronco, and this was their issue. the 200.4 manual is really clear that you need to wire directly from the battery and you need a short ground near the amp.

just because the amp powers up while using a t-harness to pull +12V from the audio module doesn't mean it will actually perform correctly.

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[Ryom]

btw if you buy a t-harness for use with a key 200.4 that has power and ground in the harness, DO NOT use those connections. instead, you need to install wire positive to the battery (I would do at least 8 gauge), and create a new ground very near the amp by using steel wool to remove a dime-sized spot of paint, and a sheet metal screw through a ring terminal.

I don't know who is making harnesses like that but I saw a FB post a few days ago where someone was complaining of noise with their Key 200.4 in a Bronco, and this was their issue. the 200.4 manual is really clear that you need to wire directly from the battery and you need a short ground near the amp.

just because the amp powers up while using a t-harness to pull +12V from the audio module doesn't mean it will actually perform correctly.

This is good advice as long wire runs will allow the cables to act as an antenna and a poor ground can cause a ground loop which will cause impedance changes depending on the electrical load of the vehicle. Power wires running parallel to speaker wires can also affect sound output, so run them completely apart if possible and cross at 90 degrees if you need to switch sides.