amp install probs

Post Mon Apr 09, 2007 7:52 pm

i have a fli 800s amp and i wire it up and get no power.

its brand new so i tested it with a multimeter by putting the red wire of the multimeter on to the live cable and the black on to the earth cable and i got a reading of 12.44V

then i did the same on the remote switch off cable but only got a reading of 1.15V when the head unit is on, when its off i get nothing.

does this seem right?

Post Mon Apr 09, 2007 8:14 pm

That is correct..

dodgey amp..?? Fuse..???

Post Mon Apr 09, 2007 8:16 pm

what the 1.15 v on the remote wire is correct? im shocked i thought it should be 12v

all fuses are fine....

Post Mon Apr 09, 2007 10:18 pm

sam325is wrote:what the 1.15 v on the remote wire is correct? im shocked i thought it should be 12v

all fuses are fine....

remote uses very little power...it's just there to tell the amp to turn on!

Post Mon Apr 09, 2007 10:21 pm

yes this is right should be between 1+2 as its only to toggle amp from stand-by to on, the amp derives its driving power from the main line (i.e the thick one)

Post Mon Apr 09, 2007 10:58 pm

ok thanks guys looks like a have a duff amp

Post Mon Apr 09, 2007 11:00 pm

I'm willing to bet major body parts that the remote lead also needs to be 12v. I appreciate it's a very low current required to turn the amp on, but you still need to have 12v.

Ian.

Post Mon Apr 09, 2007 11:11 pm

Yes the remote should be close to +12v. Try tapping the remote from the live cable to test the amp.

Post Mon Apr 09, 2007 11:22 pm

would that be safe. because what if it isnt suposed to be 12v and it damages mt amp. i wont be able to return it

they guy on the phone at the place i bought it from said they should both be 12 v

Post Mon Apr 09, 2007 11:35 pm

It is meant to be 12v. It should be ok to tap the remote from the live for testing.

BTW, did you measure the 1.15v when the remote wire was connected to the amp or did you disconnect it from the amp first?

Post Mon Apr 09, 2007 11:36 pm

sam325is wrote:would that be safe. because what if it isnt suposed to be 12v and it damages mt amp. i wont be able to return it

they guy on the phone at the place i bought it from said they should both be 12 v

RTFM !!

Taken from page 5 of the manual:

If the source (headunit) does not have a remote turn on cable then a 12v supply should be used.

If you only have 1.15v coming out of the headunit on the remote lead, then you have problems with the head unit, not the amp.

Ian.

Post Mon Apr 09, 2007 11:36 pm

i measured the 1.15v when the remote wire was disconnected from the amp

Post Mon Apr 09, 2007 11:38 pm

hmmm looks like i might have a knackered headunit then

Post Mon Apr 09, 2007 11:40 pm

when i fitted the remote wire i spliced into a wire coming out of the back of the connector for the headunit, it said wire 10 was the remote on/off wire so i think what i did was correct

Post Mon Apr 09, 2007 11:46 pm

Did you check the remote voltage at the ISO connector?

Post Mon Apr 09, 2007 11:49 pm

sorry i dont know what you mean

Post Mon Apr 09, 2007 11:54 pm

Did you check the voltage at the point the wire is spliced, i.e. at the back of the head unit?

It could be there is a fault in the splice or the wire running to the amp.

Post Mon Apr 09, 2007 11:55 pm

erm no i didnt how should i go about measuring it. what should i earth the negative out on?

Post Tue Apr 10, 2007 12:07 am

You should be ok using the earth wire on the headunit connector.

If the headunit remote out is faulty, you can run a separate wire with an in-line switch from a +12v supply as Ian mentioned earlier. If you do this the amp will need to be switched off manually using the switch.

Post Tue Apr 10, 2007 12:09 am

Another option is to use the electric aerial trigger wire. This also gives 12v when you turn the head unit on (although some units only power this wire when you listen to the radio).

Ian.

Post Tue Apr 10, 2007 12:09 am

if i kept the amp live all the time by connecting a 12v source to the remote connection on the amp would it run my battery flat

Post Tue Apr 10, 2007 12:11 am

ian do you know what button in technology is on the new style aerials? does it mean only goes up when the radio is on

Post Tue Apr 10, 2007 12:14 am

sam325is wrote:if i kept the amp live all the time by connecting a 12v source to the remote connection on the amp would it run my battery flat

Yes.

sam325is wrote:ian do you know what button in technology is on the new style aerials? does it mean only goes up when the radio is on

No idea. What make and model is the headunit ?

Post Tue Apr 10, 2007 12:16 am

the headunit is a alpine cde 7860r

my aerial is the latest beru standard aerial

Post Tue Apr 10, 2007 12:28 am

I've just read through the manual, and it makes no mention of when the aerial goes up. It does however have this comment against the aerial power wire:

NOTE
This lead should be used only for controlling the
vehicle's power antenna. Do not use this lead to turn on
an amplifier or a signal processor, etc.

Best not use it for the amp turn on then

Post Tue Apr 10, 2007 12:29 am

remote wire is blue/white stripe on alpines and you should get near 12v.

Post Tue Apr 10, 2007 12:34 am

yep it was the bleu/blanc wire i cut into yet im only getting 1.15v this is a mystery. maybe my headunit is poassed its best and i should get a new one. damn i really like it

Post Tue Apr 10, 2007 12:39 am

The 7860 has a blue white lead for powering the amp... item 4 pages 24/25

http://www.restricted.alpine-electronic ... 60R_en.pdf

Post Tue Apr 10, 2007 12:43 am

i dont understand those diagrams sorry. what does that mean?

Post Tue Apr 10, 2007 12:46 am

make sure the wire is not trapped anywhere

Post Tue Apr 10, 2007 12:47 am

yea ok i will. i did put one hell of alot of solder on it to be fair... could this be stopping current

Post Tue Apr 10, 2007 12:48 am

it shows blue/white is for amps

Post Tue Apr 10, 2007 12:50 am

yea on the top of my headunit(the bit that is visible when you slide it out) it has a key of what colour wires do what and it says blue/white no:10 remote on/off

so is this right

Post Tue Apr 10, 2007 2:01 pm

tried the voltage where i spliced the wire and it is 11.77v and now its the same in the boot. is 11.77v enough to run the amp before i go through all the hassle of wiring int in again

Post Tue Apr 10, 2007 2:49 pm

right i have power!

for a number of seconds

so what happens is when i turn the radio on and the aeriakl goes up i get power in the amp. when the aerial goes down i have power in the amp. if i disconnect everything from the back of the headunit and connect it all back up and push a button in that i have to stop the aerial coming up it gets constant power but as soon as the aerial operates i lose it again.

even if i keep the button in after using the aerial once it still does the same thing.

basically it only has power with the aerial going up or down....what a gremlin this is. i have tried 2 different head units all voltages are correct......im going to go carpet chewing mad soon!!!!!!!!!!!!!