Hi all,

Ever since I sorted out the live issue to my head unit my sub keeps draining the battery. How can I stop it from doing this?

Regards,

Damian.

You mean when the ignition is off?

The amp running the sub should be activated my a remote live from the head unit so shouldn't be on so not draining the battery?

When the ignition is off. Thats what I thought but the sub's amp still gets power to it when the car is off.

make sure the remote cable is connected properly at both ends

make sure the remote cable is connected properly at both ends

If it wasn't connected properly wouldn't it just not feed the sub?

would keep the amp on

The amp always has a live supply naturally as its connected direct (via fuse) to the battery. If the amp is remaining switched on then one of a few things is happening.

Your head unit is faulty sending a remote live out even if it's off

Your wiring is incorrect, you haven't connected to the remote live, maybe a permanent live

Your amp is faulty staying on regardless of the remote status.

Disconnect the remote live from the amp is probably the easiest start, check it goes off. If it does then the amp is fine. Now check you have wired the remote into the correct wire on the head unit, it's normally a blue wire, quite often labelled. If this wire stays live even with the set off the set is faulty.

Just to add to above

Some headunits don't actually turn themselves off despite being 'turned-off'.

Mine for example requires the faceplate to be actually removed in order to turn the H/U off completely, otherwise it'll drain the battery in about 48 hrs

Just tried the amp and that works. Using the HU I turned the SUB off and it still remained powered. Need to check wiring tomorrow. Gawd, I hop its not faulty!

Thinking maybe a cut off switch in the remote line might be an option?

Turning sub off in the head unit won't turn the remote live off as you could be running other speakers from an amp.

The amp is in built in the sub, its and active setup. I haven't gotten around to putting a 4ch in yet.

would keep the amp on

No it wouldn't, unless there was a fault, or the switched live feed was connected to a permanent live. The amp is basically relay driven. Unless the switched live input see's a 12V + signal, the 12V + live feed cannot get through to the amp, because the relay will be won't be energised in order to switch the live feed through to the amp.

The amp is in built in the sub, its and active setup. I haven't gotten around to putting a 4ch in yet.

Ok, but the head unit wouldn't know that. It just has RCA output and a remote wire, it doesn't know what it's going to.

Ok, but the head unit wouldn't know that. It just has RCA output and a remote wire, it doesn't know what it's going to.

I meant put a switch in the remote lead.

I have a horrible feeling I have been really stupid and connected it to the perm live.

I have a pioneer avh-p3300bt and the blue cable was open ended so I attached it to that from previous experience with remote's. I have a feeling it may said perm live on it? does that sound right for a pioneer or would the blue just be a normal remote line? If I have connected it to the wrong place where do I need to connect instead?

You could put a switch in the remote lead, but the head unit should be switching that anyway assuming you have connected it to the correct wire.

Surely unless the sub was actually not receiving an audio feed it should shutdown / not draw much power anyway?

The amp will stay powered though waiting for a signal if he has connected the remote feed to a live, so would probably drain the battery in a matter of hours.

The amp will stay powered though waiting for a signal if he has connected the remote feed to a live, so would probably drain the battery in a matter of hours.

Edited 15 January, 201214 yr by DBP

The amp will stay powered though waiting for a signal if he has connected the remote feed to a live, so would probably drain the battery in a matter of hours.

This is what I think has happened.

Oooo the avh 3300bt is cool :0) i think it may be what i keep nosing at???

Is it the new double din dvd??? :0)

I may be wrong as its early lol

Pics???

Alternate option is to use the Electric aerial feed out from the pioneer so goes +12Vdc live when HU is switched on.

Surely unless the sub was actually not receiving an audio feed it should shutdown / not draw much power anyway?

That would be assuming a very efficient amp, running in class AB (push-pull) operation. A class A amp will draw massive currents all the time at idle, even with nothing plugged in.

That said, I find it highly unlikely that an affordable amp will be running in class A. But cheap amps (as most car audio stuff is, in reality) will waste a whole lot of juice, as the design usually leaves a lot to be desired.

It certainly won't shutdown if it has a permanent live feed to the solenoid which is what is telling the amp to 'get itself ready' if you like.