Join Date: Feb 2009
Location: Northeastern BC
Odd. Here's some ideas I thought you could try.
Assuming this is something like the Tremor audio package, I'm looking at my factory manual wiring diagram. All 4 speakers and the subwoofers are connected to the radio amplifier. I think that's the one under the console, like you said.
Since the radio in the dash still seems to have power, but the sound cuts out, that would seem to point at the radio amp. in the console.
That amplifier is supplied by a 40A fuse in the battery junction box under the hood. It should be live at all times. It's labelled 'F2'.
Check the fuse to make sure it's good. Use an ohm meter, just to be sure. Pull it, and plug it back in. Make sure it's well-seated.
I think the amp is switched on and off by 2 wires coming from the radio, labelled in the diagram as ENABLE / CLIP DETECT. No idea what the voltages should be on those wires when it's normally operating?
If the fuse check didn't fix it, then the next thing I'd do is get out the voltmeter and check the power at the amplifier itself. According to the manual, there's a grey connector on the amp. Two yellow/red wires are heavier 12 gauge. Thats the wires going to the fuse in the battery junction box. The two 12 gauge black/blue wires are your ground. Probe those wires at the connector. You should be getting normal battery voltage.
Then watch the voltage when the truck is in gear vs. neutral/park. Does it change? Also, can you replicate the problem with the engine *not* running? ie., with the key in the acc. position, can you change gears and make it fail?
If the voltage to the amp stays the same, then the next guess would be the ENABLE/CLIP signal from the radio, which is telling the amp to shut down or resetting it, for some reason.
If the voltage on the power supply wires drops when you change gears, then maybe you have an alternator/charging problem? The theory being that when you go from park to drive, the engine RPMs drop a bit, reducing the voltage from the alternator, if you have a fishy voltage regulator.
That would mean your subwoofer issue isn't the actual problem, but a symptom of something else.
I'd be curious to know if the problem exists when the ignition is just in the ACC position, with the engine off. That would mean just the battery is running the system.
If Princess Auto were a real girl, I'd ask her to marry me.