AS3 Amplifier - no power?!

[normas_glasses]

Hi folks,
I picked up a 1999 SE vert a couple if weeks ago. There's no sound coming from the door speakers so obviously a problem with the amp. I stripped it out of the car and checked the fuse inside, which was fine.
Next, I checked the DIN lead to see if there was a feed going to the amp when the radio was switched on, which there was.....
Next I checked the power to the amp. And there is none, whether the radio is on or off. Bugger.
Checked fuse 24 and that's fine too.

Does the amp go through a different fuse? If so, which one?
Where does it ground to?
Any other ideas?

Thanks folks!

[sgould]

Additional amp is fed from fuse 25.

[normas_glasses]

Thank you for the response!
I don't have a fuse in space 25....which could be the problem, although it appears to be for something else. Can't remember what it says now...
On the card inside the fuse cover it says fuse 24 is for the radio, along with another fuse.
When I remove fuse 24 the radio stays on, so I assume it's for the amp.
Fuse 24 is 7.5A and not blown (unfortunately)

[phoenix]

Arer you sure it has AS3? It wasn't standard on SE models...

[normas_glasses]

Oh... Maybe not then!

I have an amp in the passenger footwell that matches the description of an AS3 one. There are 3 connectors - a din lead, wires to speakers and a power supply.

The power supply is dead.

Thanks,

Neil

[sgould]

Fuse 13 is Also listed as the Radio.  So is Fuse 24.

Fuse 25 is listed as the central locking as well as the extra amp. 

Confusing.

[normas_glasses]

It is confusing... Even more so when all the fuses are good and I still have no power to the amp....
Is there an inline fuse near the battery? When I had an amp installed on a previous car, they put a fuse in the engine bay (to keep any fires out of the passenger area).
If not fuses, what else could it be?
And, for a short cut, could I splice the amp into the cigar lighter power?
Thanks again.

[sgould]

I'm thoroughly confused.  You say there is no fuse 25, yet that fuse does all the central locking stuff and the boot opening relay.

So, either your car is different, or the WIS wiring diagram is wrong.

You could try feeding 12v directly from the battery and seeing if anything happens? Have you checked for speakers being there?

[normas_glasses]

Sorry for the confusion... It's down to my poor memory combined with trying to answer posts when nowhere near the car !
To summarise [correctly this time]

I do indeed have a fuse 25 and it's intact. Central locking all works fine.

The other fuses marked as radio are intact too, as is the fuse in the amplifier.

There is an amp in the passenger footwell but the black plug power supply to it seems to be dead, which I think must be the problem. [I should get a voltage across the black and red wires when the ignition is ON and the radio is switched on, shouldn't I?]. This leads me to ask if there is a fuse nearer the battery for the amp, as that's standard practice for post-factory installs.

There are speakers in the doors, which are connected to the green plug at the amp [I get a complete circuit from +ve to ground for both sides].

I'll try connecting the amp directly to the battery and see what happens.....

Thanks.

[sgould]

The wiring diagram shows that the only thing between fuse 25 and the amp is a crimp connection in the loom.  Crimp is labelled  J77.  Fuse 25 is in the circuit labelled "+30" and should be fed whether the radio is on or not. 

I need to double check, as I can't remember whether +30 is the ignition controlled circuit or the permanent battery circuit.

[normas_glasses]

Thank you - that's very helpful.

Would the central locking still be operational if there was an issue with that crimp connection ?

Does fuse 13 connect to the amp, or is that a red herring ?

I appreciate your time.

[sgould]

Firstly, the +30 circuit is the "always on" one.  So the red wire should be live all the time as far as i can see.

There are four fuses relation to the audio:

Fuse 4: This is an "always on" supply to the antenna motor, if you do not have a fixed antenna. I think that the convertible has a fixed antenna...

Fuse 13: This is the "always on" supply to the radio and the CD changer in the boot (if fitted).

Fuse 24: This is the ignition controlled power to the radio.

Fuse:25: This is the "always on" feed (via crimp junction J77) to the extra amp and some other things.  See attachment...

The "other  things" are:

354 - The extra amplifier.
305 - The red anti-theft LED on top of the dashboard.
456 - The central locking antenna.
493 - The luggage opening relay.
632 - TWICE.


J77 is described as being:  "Approx. 30mm from junction point fuse board towards the fuse board". I'm not 100% sure what this means, but I assume that the loom splits on leaving the fuse board and the crimp is about an inch before the split.

If the red wire has no power, it could have fallen out of the crimp.  There seem to be a lot of wires in the crimp.

[phoenix]

Just a thought- what year are you looking up, Will and were there any changes MY99-00...

The reference about J77 crimp means there's a single wire from the fuse board which goes into one side of a crimp about 30mm away from the board and on the other side there are multiple wires going to the different destinations.

Is there a part number visible on the amp?

[sgould]

I checked 1998, 99 and 2000, just in case.  But they are all the same as far as I can see., except that 2000 on shows some fed through connector H33 instead. (TWICE, central locking antenna) and shows the central locking linked through the TWICE. 

[normas_glasses]

Thank you very much - I'll have a look when I get an hour or two.

I suppose my next concern is that I get into the loom and find it's like a birds nest, particularly as the crimp is only 30mm away from the fuse board. That's not much slack wire - will it be difficult to separate the wires to work on?

Worst case scenario, and I have to find an alternative power supply. Can I just take it from the cigar lighter ?

Thanks again.