sry if this sounds stupid but im not much of an a/v person, anyways i disconnected my battery not too long ago and ever since my subs havent been working and i have no clue why the lights on my amps are on so im assuming they have power yet still no subs plx help

 

Use a 12V automotive test light and connect the lead with the alligator clip to the GND terminal directly at the amp.

Then probe the +12V BATT terminal, directly at the amp. The light bulb in the test light should turn on. If not, check the main fuse on the amplifier's power cable, near the battery of the vehicle. Sometimes, the fuse will look fine but the ends will make poor contact with the fuse holder terminals due to resistance build up. You may need to replace the fuse or both the fuse and the fuse holder.

Probe the REM terminal, directly at the amp. The light bulb should turn on when your radio is on and feeding +12V to trigger the amp on.

If both the +12V BATT and the REM do not light the bulb up, connect the alligator clip to a solid chassis ground such as an exposed and unpainted bolt. If then you can read power on those terminals, the GND cable to the amplifier needs to be checked.

If you've tested all three terminals at the amp and they check out ok but yet there's still no sound, four other possibilities exist, there may be no signal coming from your headunit to the amplifier, the wires inside the box can be detached, the subwoofer(s) can be blown, or the amp can be bad.

Just to see if the subs are still moving, you can connect a little 12V battery the the speaker wires and the sub should make an audible thud sound and move a little.

To test and see if there's still signal coming out of your headunit, you can plug the RCA's into another amplifier (maybe if you have a 4channel hooked up) and make sure you're sending full range sound and not just bass because you may not be able to hear the mids playing just bass. Or you hook up a small speaker to the RCA cables by wrapping the negative wire to the shield (outter ring of the RCA cable) and holding the positive wire to the center core. If you turn the volume up, you should be able to hear music, again, make sure that you're sending full range music by turning off any internal crossover on the headunit.

If that checks out, then your amp is either blown or hopefully the settings on it may be wrong.

Make sure the LP is on, gain is set at about mid for testing purposes, and the subsonic is off.

Hope this helps.

 

do you have an aftermarket head unit?
if you do does it have a subwoofer on/off option?

if it does then turn it on

 

thnx alot ill try and test these tomorrow when its light outside

 

all that info up there is good & all
but way too much for ur problem

if you just unplugged ur battery like u said & the amp still has power but your sub isnt on

check the settings on ur deck
no need to do all that yet
start with the basics

 

alright well yes i looked and my sub setting is on, on my head unit