system thumps very loud when turned off... help please

[TIM TIM TIM]

i just hooked up my old system in my dads van (his now). its 2 eclipse titanuim 12's, kicker sx 1250.1 and 9004 with the sxrc, alpine hu ect. but every time i turn the key off it thumps VERY loud, but if i just turn off the head unit its fine. ??

[the727kid]

Check your grounds. Make sure the amp grounds are on bare shiny metal and rather short wire (unless ran to the battery). If that don't help, unplug your RCAs and see if it still does it. If that doesn't help re-ground your HU.

BTW nice speaker choice ;).

[TBSpyder]

what's the remote turn on hooked up to?

[djgizmo]

Good call on removing the rcas and then trying. Sounds like you may need a delay relay for the deck. Sounds like when you turn off the key, the deck shuts off 1st, which causes a slight 'pop' thru its rca outputs, which of cause your amp amplifies before the remote wire turns off the amp. The amp needs to shut off 1st before the deck to prevent the 'bump'. You could use a switch for the amp (simple), or try to find a delay relay for your deck.

I've heard that same kind of popping on pcs, laptops, cd decks, its a pain in the ass. I've always had to resort to shutting down the amplified output before shutting down the source.

Check your grounds. Make sure the amp grounds are on bare shiny metal and rather short wire (unless ran to the battery). If that don't help, unplug your RCAs and see if it still does it. If that doesn't help re-ground your HU.

BTW nice speaker choice ;).

[TIM TIM TIM]

its in an expresss van where you have to have that thing to hook up an aftermarket hu, if that has anything to do with it??? all of teh wiring is kicker also, the 7.0mm rca's and 0 guage kicker wire ect. its pretty annoying. ill try the rca thing tool thanks.... also the remote is hooked to the "amp turn on" blue wire behind the deck

[the727kid]

My money is still on the grounds.

[TIM TIM TIM]

checking them later on, hope thats it.

[TBSpyder]

I'd try a different source for the remote turn on.

[TIM TIM TIM]

kind of wierd that would be the prob since the wire is labeld amp turn on

[TBSpyder]

Worth a shot. Or it could just be the kicker amp, i've seen them do that before.

[GradeA_TireFryer]

i say ground, check the condition of the ground at the battery, did you up grade the neg on battery when you put the 0 gauge on the +

[TIM TIM TIM]

no i figured it was fine.. its a 2 battery set up already.. diesle 3500 chevy

[TIM TIM TIM]

the ground just goes strait over to the chasis on that battery, its the 2nd one that i hooked to, up under the van

[racerraul]

Moving grounds can help IF there is a ground loop. If not, it could simply be that one of the system's components down the signal chain is sending the signal upon turn off regardless...

To explain why it doesn't occur when you power off the HU, it could be that the sequence in which the components turn off is different, thus powering off the amps 1st & then the signal is sent but doesn't reach the speakers since the amps are already off...

This is all a guess, you'll need to try & Isolate the component sending the signal, once you have it ID, you can install a small cap & diode on its turn on wire to delay its turn off to the rest of the system, thus the signal will get nowhere with everything else already off...

PM me if you want my help... I don't check this section often with the bike taking up all of my time.

Good Luck...

[djgizmo]

Didn't I already say this...

Moving grounds can help IF there is a ground loop. If not, it could simply be that one of the system's components down the signal chain is sending the signal upon turn off regardless...

To explain why it doesn't occur when you power off the HU, it could be that the sequence in which the components turn off is different, thus powering off the amps 1st & then the signal is sent but doesn't reach the speakers since the amps are already off...

[racerraul]

Didn't I already say this...

Yes you did... now do you think that 2 people saying the same thing could by some remote chance help the person that needs help, perhaps go in the right direction to solve the problem since 2 or more people are now in agreement?

Give me a break will ya? My post was not intended to be better than yours... :lol:

[djgizmo]

I'm not saying you tried to out do my post, but obvious you didn't read my post on the subject. I'm not going to do the work for him, I asked him to check and try. I can give ideas, not mexican labor, thats what NotLad is for ;)

[racerraul]

I read every post... and I even gave a diff plausible solution than yours as another option. The whole reasoning behind my repeated explanation was to help maintain a coherent thought process within the post to help understand how the cap & diode in the remote wire would help maintain power to the culprit device sending the unwanted signal. I like this method better cause you don't have to worry about forgeting to hit a manual switch.

One thing is obvious... you have no idea what I read on the forums I visit all day... you can obviously assume quite well, but that doesn't make your assumptions to be correct.

Again... I supported your post... That's a good thing.

[TBSpyder]

Would you guys quit bickering? It's like the school playground around here. "I said it first, nana nana boo boo."

[P057]

Would you guys quit bickering? It's like the school playground around here. "I said it first, nana nana boo boo."

I said that like ten threads back, stop stealing my thunder John... :roll:





:D

[racerraul]

Hey now... I told him I supported his theory... it does nothing for my self esteem who said what first...

[TIM TIM TIM]

well i appreciate both of you guys's imput and didnt at all take it that one was outdoing the other or whatever.. unfortunatly i havent had time/drive to try anything.. ill update when i do

[TIM TIM TIM]

well i scraped all the paint from the ground and that didnt work so i tried hooking to the red accesory wire in the back of the unit instead of the blue remote wire and it still pops, now it pops when i turn the radio on as well... also sometimes when driving it pops loud and then the radio stays on, same with the amps, but themusic wont play untill you turn it off and back on... any ideas?

[P057]

well i scraped all the paint from the ground and that didnt work so i tried hooking to the red accesory wire in the back of the unit instead of the blue remote wire and it still pops, now it pops when i turn the radio on as well... also sometimes when driving it pops loud and then the radio stays on, same with the amps, but themusic wont play untill you turn it off and back on... any ideas?

Have you tried the delay start or a switch relay? (doing these are much easier than you think)

I'm having the same problem now with my twin D600 amps... but its a small pop, and it goes away if i switch the track just before turning the car off.


I just cant put anymore switches and relays in my car... its way too much.... i think i have 15 aftermarket relays and 4 switches in my car for my stereo and lighting alone... =[


i kind of just ignore it now.

[GradeA_TireFryer]

unplug rca's - turn on - off - does it pop? -if so regroud you deck - if pop is coming thru the rcs from deck - temp try another deck - there a few filters you can try - tis is just a trial and error process

[TIM TIM TIM]

well everything is ran off amps, so if i unplug rca's it cant pop, well i wouldnt hear it atleast

[GradeA_TireFryer]

Then the sound is coming from your head unit! - try another head unit - try grounding the outer connector of the rca's - you can also use a timed relay on the remote wire to turn your amps off after your radio turns off - this use to be a big problem in the past - have not seen it that often anymore - what type of car is it in - what type of head unit is it

[TIM TIM TIM]

its an 06 chevy van with the little box thing that the newer gms are supposed to use.. its an older alpine 9807 (not too old but a few years) ill try a new one

[TIM TIM TIM]

i tried a differant deck, still did it.. it was another alpine so i just pluged the old harness into the new unit... i tried to hook up the remote to my cars remote and see if it popped when i turned off mine but for some reason they wouldnt power up?? i put it on a switch, on the constant wire and when i turned off the car it still popped.. wtf is the deal here!

[GradeA_TireFryer]

remote would not turn it on becuae you would have to ground both cars together, reground the radio to metal - dont use harness ground, check ohms from radio ground to battery - then amp ground to battery, put amp in another car and see if it still does it - maybe bad amp circuit.

[TIM TIM TIM]

well right before the amp was in this van it was in my car, I installed it both times and did everything the same and it was perfect in my other car. i didnt disconect the grounds in the harness but i untaped and put a wire from there to metal (so i guess it was grounding at the harness ground and the metal i had it on and it still did it... would i need to seperate the ground and not let it through the harness? when you say check ohms from radio ground to battery, and amp to battery, how would i do this ( i know a multi meter).. i guess i dont understand what you mean there.

[GradeA_TireFryer]

yes multimeter the ohms - i would leave the factory ground hooked up and add my own to a good metal surfaceon the hu,
if you power the remote with constant battery power and turn radio on/off does it do it?
if you leave radio on and power to remote on/off does it do it?
if the radio is off and you power the remote on/off does it do it?

[TIM TIM TIM]

if i power with constant and turn hu off it pops, if i touch the remote to the constant and pull it off it does nothing. if the radio is off and i touch to the constant still nothing.. .only does it when the hu is turning off.

[TIM TIM TIM]

also i really appreciate all of the help your giving me

[GradeA_TireFryer]

Toby - Any Suggestions?

[TBSpyder]

Different head unit.

[TIM TIM TIM]

tried another.. it was an alpine about the same year but what are the odds of both of them doing it?

[GradeA_TireFryer]

you said it is a 06 chevy van, did you have to use the black box for a wire harness kit? - what i mean then new gm cars do not have a real 12v acc. to test my new idea run a temp wire from battery + and connect he emeory and acc wire from radio - turn radio on/off -does it do it? if that fixed it, run a new 12 constant and acc fused from the steering column
I think that is it - you said 2 hu do the same thing and those new pos chevy wiring harnesses have caused problems for me before.

[TIM TIM TIM]

yeah its got the black box, i thought it may have somthing to do with it but nobody else said anything about it