Technical No power to amp :(
- Thread starter BradThomas
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Technical No power to amp :(
Hi mate,
Have you got a multimeter or test bulb?
Check you have permanent 12v on the "+12v" wire.
You should have switched 12v on the "rem" block
And you should have good continuity between the body and the "gnd" block.
If any one of them are missing then your amp wont turn on.
What have you wired the remote wire to?
Also have you checked the amps own fuses as well as the inline fuse on the cable that goes from the battery to the amp.
Alan
Have you got a multimeter or test bulb?
Check you have permanent 12v on the "+12v" wire.
You should have switched 12v on the "rem" block
And you should have good continuity between the body and the "gnd" block.
If any one of them are missing then your amp wont turn on.
What have you wired the remote wire to?
Also have you checked the amps own fuses as well as the inline fuse on the cable that goes from the battery to the amp.
Alan
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Check your earth as well if the fuse has blown, I blew up a sub/amp by having a lazy earth 
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OP
OP
I'm a bit of a newbie to this but what does switched 12v on the rem block mean? I'll try to take closer pics later, I grounded it to the sea belt anchor but my mate done this and I think the inside of the body is painted isn't it? So it might be the ground, I might have to sand it down and the rem wire is connected to the rem labeled wire on my head unit
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best earth is rear panel left as you look over tailgate slam panel and it undoes with nice big chunky 13mm socket
with regards power from battery have you grommeted it into the car?
with regards power from battery have you grommeted it into the car?
Hi mate,
Yep the remote wire sounds correct
You need the ground wire to make good contact with the body of the car. The paint will insulate the connection and prevent a good electrical contact. As you say, normally you would sand or scrape away the paint in the area that you are making the connection. It needs to be a bare metal to bare metal connection.
re the "switched live" on the remote connection.... The amp is fed with a permanent supply direct from the battery. The remote cable only becomes live when the head unit is switched on. Therefore, the amp needs both a permanent live (direct from the battery) AND the switched live (from the rem wire on the head unit to rem on the amp) in order to power up.
Alan
Yep the remote wire sounds correct
You need the ground wire to make good contact with the body of the car. The paint will insulate the connection and prevent a good electrical contact. As you say, normally you would sand or scrape away the paint in the area that you are making the connection. It needs to be a bare metal to bare metal connection.
re the "switched live" on the remote connection.... The amp is fed with a permanent supply direct from the battery. The remote cable only becomes live when the head unit is switched on. Therefore, the amp needs both a permanent live (direct from the battery) AND the switched live (from the rem wire on the head unit to rem on the amp) in order to power up.
Alan
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OP
Where is that :S and yes I its runs through a grommet if that is what you mean haha I'm terrible at explaining
OP
OP
Ahhh I've lost you at the end Alan, so looks like I'm missing a wire then, I've only got one remote wire? Erm I'll take more pictures
Hi mate,
No it looks like you have it all done correct!!
Only 1 remote wire (switched live)
only 1 permanent 12v
Only 1 Ground.
Looks like your problem may well just be a dodgey connection on the ground.
Alan
No it looks like you have it all done correct!!
Only 1 remote wire (switched live)
only 1 permanent 12v
Only 1 Ground.
Looks like your problem may well just be a dodgey connection on the ground.
Alan
OP
OP
I will have a look in a sec
OP
OP
It's got a 30 amp fuse on the power lead and a 25 amp fuse on the amp is that right?
Hi mate,
The exact specs for the fuses will depend on the cable and the amp.
The amp one should be written in the amps manual or on the sticker at the back somewhere. 25amp sounds about right. Is it a pioneer amp by any chance?
Different thicknesses or "gauge" of cable will have different ratings of how many amps they can carry safely. The idea is that the fuse is lower than the maximum capacity of the cable, so that in the event of a short circuit the fuse will pop instead of the cable potentially heating up and catching fire. Again, the amp rating of the cable may be written on it somewhere, or at least the gauge of the wire.
Alan
The exact specs for the fuses will depend on the cable and the amp.
The amp one should be written in the amps manual or on the sticker at the back somewhere. 25amp sounds about right. Is it a pioneer amp by any chance?
Different thicknesses or "gauge" of cable will have different ratings of how many amps they can carry safely. The idea is that the fuse is lower than the maximum capacity of the cable, so that in the event of a short circuit the fuse will pop instead of the cable potentially heating up and catching fire. Again, the amp rating of the cable may be written on it somewhere, or at least the gauge of the wire.
Alan
OP
OP
It's a jbl gto 450w amp I think with a jbl 1000w sub, and 10 gauge wire
OP
OP
Hi mate,
I googled that amp and its a 25a fuse so thats correct
10 Gauge wire is also good for 30a so that is also correct
From the above pictures... I cant quite see where its connected in the second pic, but if you want to test to see if its a ground issue, and you dont have a multimeter or test probe, you could always move the ground wire to another point such as the boot lock temporarily and see if it then works.
Also in the first pic there is no fuse in the amps fuse holder. Im assuming it was just out whilst the picture was taken, because obviously the amp wont work without it.
Apart from that, it all looks wired correctly, so really you would need a multimeter to confirm you deff have voltage and ground at the amp, if you do, its possible the amp may be faulty.
Alan
I googled that amp and its a 25a fuse so thats correct
10 Gauge wire is also good for 30a so that is also correct
From the above pictures... I cant quite see where its connected in the second pic, but if you want to test to see if its a ground issue, and you dont have a multimeter or test probe, you could always move the ground wire to another point such as the boot lock temporarily and see if it then works.
Also in the first pic there is no fuse in the amps fuse holder. Im assuming it was just out whilst the picture was taken, because obviously the amp wont work without it.
Apart from that, it all looks wired correctly, so really you would need a multimeter to confirm you deff have voltage and ground at the amp, if you do, its possible the amp may be faulty.
Alan
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OP
OP
Haha yeah sorry m, I took the fuses out :') yeah I'm going to try changing the ground to a different location, if that doesn't work then I really don't know what I've done wrong
Hi,
Dont worry mate, and dont blame yourself yet! It may well be that you have done nothing wrong at all and the amp is simply faulty.
From your pictures and description it all looks correct, so just check all your connections are making good contact...
Clean the earth point or move it like we suggested
Also check the connection at the battery end is good, as looking back at that picture it looks a bit tarnished.
Youll get there!
Alan
Dont worry mate, and dont blame yourself yet! It may well be that you have done nothing wrong at all and the amp is simply faulty.
From your pictures and description it all looks correct, so just check all your connections are making good contact...
Clean the earth point or move it like we suggested
Also check the connection at the battery end is good, as looking back at that picture it looks a bit tarnished.
Youll get there!
Alan
OP
OP
Yeah it is a little corroded, what can I do to clean the surface, lots of people have said hot water and stuff?
Hi mate,
Water wont do much, best bet is a bit of sandpaper or emery cloth. make it nice and shiny/bright. Worst case just scratch it with a screwdriver to remove the tarnish.
Alan
Water wont do much, best bet is a bit of sandpaper or emery cloth. make it nice and shiny/bright. Worst case just scratch it with a screwdriver to remove the tarnish.
Alan
OP
OP
Will try it cheers for the help, where is this other place you can ground it to is it the boot lock or something?
cheers for the help, where is this other place you can ground it to is it the boot lock or something?
