Hello,
I recently got a 98 montero with the infinity audio system. The truck already has an aftermarket stereo installed and aftermarket speakers.

I noticed that the previous owner had bypassed the factory amp and just ran speaker wire straight from the speakers to the deck but the deck is wired into the factory plug.

I plugged the speaker into the factory speaker wire plug but got no audio. I heard there is a certain way to make an aftermarket radio work with the stock amp?

anyone know the details?

1998 Mitsubishi Montero
2" Body lift
35" Cooper tires
Parrot Asteroid Smart w/ factory AMP
Cobra 29 LX CB Radio w/ Firestik MK-DM18R rooftop mount
Aisin Manual hubs
Grote 36 LED, TractorPlus (Wired to factory fog light switch)