1970FuryConv
Old Man with a Hat
Innovative! Where did you put the ignition coil bracket? On the firewall?
Radio interference, I'm out....
- Thread starter luigi164
- Start date
'66 Fury I
Active Member
This was a long time ago, but I think I secured it to something under the dash with a hose clamp- nothing fancy! Lindsay
1970FuryConv
Old Man with a Hat
Sometimes a rig is required.
Was this video in your garage, or outside, away from metal buildings?
luigi164
Active Member
Outside...
luigi164
Active Member
Update: Today I started with the tips & tricks given here.
- Disconnected the fieldwires at the alternator: NO result
- Pulled alle the fuses one by one: NO result
- Connected an extra groundwire from the VR to the engine (on the coilbracket) NO interference !!!
I was so surprised I started the car several times with the radio on ( low volume) and I couldn't hear any interference...!!
Reved the engine, hit the brakes several times, nothing...
So, I thought I solved the issue and put everything back together, feeling good.
Untill I took the car for a ride an hour later.
Started the car , turned on the radio and.........interference
During the ride it was as if nothing had changed, interference all the time and louder with higher revs and during braking.
So the story goes on. Next step will be checking grounds in the taillights......sigh
- Disconnected the fieldwires at the alternator: NO result
- Pulled alle the fuses one by one: NO result
- Connected an extra groundwire from the VR to the engine (on the coilbracket) NO interference !!!
I was so surprised I started the car several times with the radio on ( low volume) and I couldn't hear any interference...!!
Reved the engine, hit the brakes several times, nothing...
So, I thought I solved the issue and put everything back together, feeling good.
Untill I took the car for a ride an hour later.
Started the car , turned on the radio and.........interference
During the ride it was as if nothing had changed, interference all the time and louder with higher revs and during braking.
So the story goes on. Next step will be checking grounds in the taillights......sigh
1970FuryConv
Old Man with a Hat
If the taillights are bright and operational, I don't see why they would be the problem.
I'm still thinking instrument panel voltage regulator and condenser. However, I can't explain why the problem stopped for a brief time period.
Maybe @Zymurgy can help
I'm still thinking instrument panel voltage regulator and condenser. However, I can't explain why the problem stopped for a brief time period.
Maybe @Zymurgy can help
Only thing I can add is adding an in-line noise suppressor for your new radio. I worked at a big car radio store many many years ago. Sometime and usually from an older cars, there would be bad interference when the engine was running, a noise suppressor seemed to always fix the problem
1970FuryConv
Old Man with a Hat
Thanks!!!
luigi164
Active Member
I also tried to connect the radio directly to the battery (+ and -) I assume I bypass the instrument panel VR that way or not ?
I agree there will be a constant power lead connect it straight to the battery and then hook the noise suppressor to the power lead which is switched.
1970FuryConv
Old Man with a Hat
yes, you bypassed the instrument panel voltage regulator.
Assuming you still have the noise/static, I agree with an inline noise suppressor on the battery power input wire to the radio.
The instrument voltage limiter supplies 5 volts to the instruments. It isn't something that you would have been able to wire into easily.
When it's working, it can create some RF interference and there's usually a suppressor attached to it.
Since you really can't find the cause, try installing something like this in the power to the radio.
Amazon product ASIN B07HZ4RSS7
luigi164
Active Member
The problem is solved !!!
It's been a while since I had this "interference" problem. I left it for what it was and paid no attention to it anymore.
Untill I changed the sparkplug wires as they were on the engine for as long I own the car (17 years..)
And thát did the trick, no interference anymore. ..
Thought I would let you all know..
3175375
Senior Member
Glad to hear that you solved the issue. Can you please repeat the changes that you made for completeness?
luigi164
Active Member
Sorry, don't know what you mean ...
3175375
Senior Member
To fix the issue, you replaced the spark plug wires and ???
luigi164
Active Member
Before that I rewired the power supply for the radio from different sources on the fusebox ( switched/unswitched). Source directly from the battery. I checked the grounds everywere. Placed different suppressors. Installed a new alternator.
All the above didn't help and the interference continued.
Untill I replaced the sparkplug wires and thát cured the issue. Probably these wires were bad although the car ran fine.
Luigi
1970FuryConv
Old Man with a Hat
Hi Luigi
If you had non-RF spark plug wires, the wires weren't bad, but they were designed without concern for radio interference.
"Spark plug wires: Like spark plugs, non-RF (radio frequency) wires can also produce significant levels of interference. Solid core wires, including racing plug wires, are particularly prone to causing EMI problems."
See spark plug wires section of article below.
Combining Old and New - EMI Interference.
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