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Old 10-23-2017, 03:57 PM
computersoc computersoc is offline
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Join Date: May 2012
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Default Radio ground

Where is the FM radio ground located? A few years ago I had a touch screen radio put in place of the OEM radio. When it's picking up an analog signal it gets crackly like an AM station with engine noise. If the signal is digital, then it is fine. It sounds like a ground issue. Should it be grounded to a different spot?

Also, what is this ground in the back middle under the hood? Should it be touching the body, or should I unbolt it and move it away?
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  #2  
Old 10-23-2017, 06:17 PM
LargeR LargeR is offline
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Default Re: Radio ground

There should be 2 pins on the factory connector that is ground. See the attached wiring diagram. Also, it looks like the ground in your photo is okay. You can test it for a voltage drop by hooking a multi-meter to each end of the wire (or ground strap) and applying a load (running engine, radio, lights or whatever is required by that circuit). Ideal drop should be 0.00 volts.
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File Type: pdf 2001 2.5 Ground distribution 2.pdf (85.2 KB, 10 views)
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  #3  
Old 10-23-2017, 09:55 PM
Undrstm8ed Undrstm8ed is offline
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Default Re: Radio ground

Quote:
Originally Posted by computersoc View Post
Where is the FM radio ground located? A few years ago I had a touch screen radio put in place of the OEM radio. When it's picking up an analog signal it gets crackly like an AM station with engine noise. If the signal is digital, then it is fine. It sounds like a ground issue. Should it be grounded to a different spot?

Also, what is this ground in the back middle under the hood? Should it be touching the body, or should I unbolt it and move it away?
What you're describing sounds more like interference, not a ground plane issue. The newer head units are a bit more sensitive in general for better reasons but its a bit of a double edge sword. Must be a pretty important radio station for one to start chasing down ghostly ground loops (?).

The ground strap on the firewall connects to the back of the head/block to include the firewall withe the rest of the earthing of the chassis so that windshield wiper motor doesnt back feed or radiate EMF noise. No need to move it nor would I remove it. When i was upgrading all of the vehicle grounds from the battery system in my 93', I had left that temporarily disconnected, radio is always on, and I seem to always bump my leg into the stupid multifunction switch that operates the wipers. The noise introduced sounded like a temporary alternator whine until I replaced/reconnected it the following day with the upgraded wiring; Needless to say, noise gone.
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  #4  
Old 10-24-2017, 03:45 AM
computersoc computersoc is offline
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Default Re: Radio ground

It does it on all stations, not just one.
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Old 10-24-2017, 04:56 AM
dvrich dvrich is offline
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Default Re: Radio ground

Quote:
Originally Posted by computersoc View Post
Where is the FM radio ground located? A few years ago I had a touch screen radio put in place of the OEM radio. When it's picking up an analog signal it gets crackly like an AM station with engine noise. If the signal is digital, then it is fine. It sounds like a ground issue. Should it be grounded to a different spot?

Also, what is this ground in the back middle under the hood? Should it be touching the body, or should I unbolt it and move it away?

That's a great idea......disconnect the ground from the engine block to the chassis. It should be against the law for someone with a double digit IQ to work on a vehicle.
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Old 10-24-2017, 05:08 AM
computersoc computersoc is offline
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Default Re: Radio ground

Your reading comprehension skills are lacking. The ground is touching the chassis and I asked if I should unbolt it and move it away (therefore rebolting it).
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Old 10-24-2017, 12:07 PM
Undrstm8ed Undrstm8ed is offline
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Default Re: Radio ground

Quote:
Originally Posted by computersoc View Post
It does it on all stations, not just one.
before I suggest a filter of sorts, cause usually that throws one issue out the window but creates additional ones. I would take a normal automotive wire, say 18ga.. attach it to the ground wire. turn the radio function on and touch it to different parts of the [RADIO] chassis and see if the noise continues, lessens, or goes away. There very well could be a bad solder joint on a board or depending on brand, just poorly designed in the name of COGS thats not fully grounded other than through circuitry and its causing a possible back-feed or EMF noise..

Quote:
Originally Posted by computersoc View Post
Your reading comprehension skills are lacking. The ground is touching the chassis and I asked if I should unbolt it and move it away (therefore rebolting it).
Not to point out the obvious here, I know Dvrich loves a great argument but. the "ground" braided cable you are describing as touching the chassis? The Chassis is ground itself, both points are connected through the braided cable itself on both the engine ground side which is connected through the block at one of the starter bolts to the frame through a stripped back portion of the insulator with a grounding tab crimped on to the Battery negative terminal itself which also grounds from that same point to the header panel above the left headlight just left of the radiator/Ac line and to under the fuse box area if I recall.

In essence, its a moot thought.
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