No sound after install on 94 explorer. HU problem or factory amp?

[Hockyeyd214 10+ year member]

Hey,

I just installed a newer alpine deck into my buddies 94 explorer w/ premium sound. The head unit turns on fine but NO sound, not even static out of the speakers. I double checked all the connections and everything is hooked up fine. Is the head units internal amp bad or is there a factory amp that needs to be disconnected/bypassed for it to work.

Also, He had an aftermarket stereo (really old Aiwa) installed and it worked fine but he was just looking for an upgrade.

Please any help?

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[DeViOuSoNe 10+ year member]

Some of the NEWER alpines dont have an internal amp..What model is it?

 

[KaeZoo 10+ year member]

There will almost always be a factory amp in a 94 Explorer, located under the passenger side panel in the rear cargo area.

 

[systembumping 10+ year member]

There will almost always be a factory amp in a 94 Explorer, located under the passenger side panel in the rear cargo area.

Yessir.

 

[baseballer1100 5,000+ posts]

Its the internal amp in the headunit most likely or at least in my 9856 it needs to be turned on.

 

[DeViOuSoNe 10+ year member]

But if it was the factory amp doing it the aiwa wouldnt work either..>Correct?

 

[j3bus2k3 5,000+ posts]

Its the internal amp in the headunit most likely or at least in my 9856 it needs to be turned on.

Have you tried that yet? That could very well explain it. Find the area of the menu to turn the internal amp on/off...its probably labeled as INT or PWR.

 

[Randy Savage 5,000+ posts]

Could also be a bad speaker/speaker grounding out.

Not sure how the Alpines work, but I know some radios will go into protect if there is a speaker grounding out.

 

[KaeZoo 10+ year member]

If the factory speaker connections behind the head unit are in a small, square plug, then there's a factory amp. If they're in a broad, flat black plug, there's no amp.