Electrical HU nightmare

[Naplm00]

long story short...

installing my passenger seat i crushed a speaker wire and shorted it.

it blew the amp

now have new amp

reinstalled and now i have a alternator whine...wtf



RCAs are run on the opposit side of the car, unpluggd antenna..still doing it, unplugged RCAs and started car...no noise

so tht rules out, speaker wires, speakers, amp? who knows




so now on to the question, while rewiring my HU to be less complicated, i noticed that the PO used the hazard switch as Batt 12+...where do you guys connect your batt +12? I was thinking of runninga new line just to be safe.


also What the hell else could cause this whine? :hitler:


OMFG you should have seen bhind the HU..it was a fucking nightmare

[Naplm00]

ugh we may want to move this thread to car audio ...i posted in here by accident


also i will be trying a new set of RCAs outside the car tomorrow, ill have to go pick some up

[AndrewBird]

Ground loop problem would be my guess. Either that or badly shielded RCA's.

[kronus]

You want to pull clean +12V from something more solid than the hazard switch... there should be a good filtered +12 line in the radio harness, unless yours has been butchered to all hell.

Your alt whine may be a ground problem, too.

[Naplm00]

yea, ill by trying out some external run RCAs today or tomorrow, the ones in the car from the PO are not sheilded.

I'm going to dig around in the harness messs for a 12+ batt, i think it might be purple/brown


what a pain in the ass


the kicker is that i never had a whine before i had this current issues with the amp.

[homegrone30]

Dude do what I did when my sterio got stolen. Get on ebay buy 50ft of good speaker wire,your rca cable, heat shrink, a soldering iron, and solder. Then take one day an redo everything and you will be a very happy man. I installed my head unit a year ago and have never had one single problem.

[Naplm00]

ugh, i know


i just got a 20 foot RCA from work and im goin to test tonight, if i can get it to work then ill re run the lines

[Naplm00]

ok update

tried the external RCAs...still whining
Tried another amp...still whining
Tried another HU...still whining
Tried grounding the HU to batt...still whining
Tried disconnectiong all speakers one a time and reconnecting...still whining
Tried spare speaker directly to amp in trunk...still whining
Tried moving HU to trunk and running directly conected to amp with external RCAs and external speaker...still whining


WTF WTF WTF help!


next will try grounding amp to BATT in engine bay


is it possible that a random bad chassis ground can be causing this?

from running the shit out of the trunk with external speaker and external RCAs...they are definatly not he culprit

Also when the car is on engine not running i can hear the HU motor in the speakers...like a slight putting sound...could be that or the ICV..the only 2 things i know of that run with the car on engine off

[Naplm00]

ok

tried running external power to amp and HU in trunk from batt..still whining


Also measured the resistance from the amp ground terminal to a few spots on the chassis in the trunk and was reading about 5 ohms


measued from the RCA collars on the amp with no RCAs attached to ground and was reading about 35-45 Kohms

what the hell is goin on here?

[Naplm00]

ok some more info


ran a shorted RCA pin to collar and nothing else on the amp with the engine running...no whine, same as running NO RCAs


with a Gameboy hooked up to the amp with a line in and th engine is running thre is no whine

This HAS to be a ground loop...BUT, even with the HU in the trunk...sitting on the amp...sharing the same power and ground, with EXTERNAL RCAs, i had noise


im goin to have to reground the amp again and chassis groud the HU somewhere up front, and we wil see what happens



any insight?

[Naplm00]

Omfg...went for a drive, now my tach, econmy gauge, obc, and door chime don't work.

So iguess the obc controller bit it