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Danny,
Ground
loops are often a pain in the arse to trouble-shoot, but I've found several
things that can cause them.
Here's
how to prevent them in the first place:
1.
Keep the head unit and any amplifiers ground (black) connections as short as
possible and run to a solid part of the car's body or frame (if possible within
a few inches of the unit). I've had to utilize a copper ground block
(purchased from Home Depot's electrical department) bolted to the frame for big
amplifiers.
2. For
positive (+) connections to the head unit, use a straight (fused) connection
directly to the battery, avoiding the car's accessory lines.
3. Use
quality components- the off-brand, cheapie head units skimp on noise isolation
circuitry and these units are more prone to alternator whine (more a problem in
the previous generation components).
4. Use
the Radio Shack Ground Loop Isolator for the head unit-to-amp line out
connections.
I hope this helps!
George
"Little Beast"
'89 DX-Hybrid-D16Z6, 128k miles
Seats, Suspension, Engine,
MSD
I also want to clear this up for myself, would
his ground loop be coming from his head unit and his cigerette lighter being
grounded to the same spot. I know they wire into the same harness, so
they probably have the same grounds. Just checking, not to
sure.
Danny.
----- Original Message -----
Sent: Sunday, February 02, 2003 8:30
PM
Subject: CRX: RE: Re: audio hum
Ronnie,
You have a ground loop which is causing "alternator whine." The
solution is to purchase a ground loop isolator audio cable that Radio Shack
sells. Check out the http://www.radioshack.com and look up
the following:
| Ground Loop
Isolator |
 |
| $14.99 |
Brand: RadioShack |
| Catalog #:
270-054 |
George
"Little Beast"
'89 DX-Hybrid-D16Z6, 128k miles
Seats, Suspension, Engine,
MSD
furthermore:
there is an 1/8" input on the front of the
reciever.
im plugging my cd player in through
this
the hum ONLY happens when the cd player is
being used while powered by the cigarrette lighter.
ideas?
----- Original Message -----
Sent: Sunday, February 02, 2003
6:45 PM
Subject: CRX: audio hum
i installed a stereo today in 88
si.
bear in mind no RCA cables
involved
a hum can be heard over spearkers when the
engine is running....the hum's pitch increases as rpm's
increase.
my friend tony said..."need a ground loop
isolator"
i went to walmart...all they had was RCA
GLI's....
what do i do????
thanks,
ronnie
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