getting a thump when car is started

[swangin68 10+ year member]

ok i searched for days and i really cant find a solid answer or even a realistic possibility..ok,, i installed in a scion xb a LOC with a sub amp and 1 12" type r. it was working just fine for a while, then one day i decided to try a more powerful amp so i pulled that one out and put in another one,,, also i might have grounded the remote wire on the amp, i seen it touching it and i might have had the key on dont rememeber...so if it had juice i might have messed something up in the HU...now it thumps for a good 1 solid second when u start the car... if the key is off and u straight start it it wont thump, but if u click the acc on and let the amp turn on and radio, then start it. it thumps. like it dosent fully turn off anymore as the starter is turning over...

i have the remote wire to the acc fuse i think, i forgot what fuse exactly but it worked fine.. the fuse was not popped either,, still works just thumps now...for like as long as u hold the key to start thats how long it bumps.....

its annoying me,, should i switch the remote wire and tap it to the radio switch or the lighter or something.. i hope i didnt damage anything.. also its not the amp i checked it and its fine.. im pretty sure its the remote from the car....

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[91Chevy 10+ year member]

Check your grounds. I've heard that the Scions can be hard to find a good grounding point on.

 

[swangin68 10+ year member]

ground is to the battery....its good... like i said it was fine for a while then i tried another amp then put the original back and now its there, didnt change anything...

 

[phemps 10+ year member]

Did you try to ground your RCA's?

 

[aliensong]

I had never encountered this problem. Dunno what's the true reason! //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

 

[fshanda 10+ year member]

Find the remote to the head unit and try switching to that. Cant hurt and might help. DId that on my sons car and got rid of the amp pop.

 

[prcwitt 10+ year member]

If the loc has a ground wire on it try grounding it also try running a ground wire from your factory radio harness to the ground input of the amp.

 

[swangin68 10+ year member]

If the loc has a ground wire on it try grounding it also try running a ground wire from your factory radio harness to the ground input of the amp.

havent tried grounding the rca,,, how u do that? also the loc does have a ground connection which has never been hooked up. but if these choices were the case wouldnt it have always done it? these 2 things were never done so why would that change now....???

 

[91Chevy 10+ year member]

http://www.caraudio.com/forum/showthread.php?t=198477

RCA Grounding.

Try ground the LOCs as well.