Radio noise resistor/suppressor

[Linda]

Does anyone know to which terminal on the coil the radio noise supressor hooks up to? Also if I have the EI distrbutor and the 12 V coil can the suppressor still be used? I have the OEM radio and am going to be trying to eliminate the static in it with the suggestions posted earlier, then I realized there is that little suppressor (not sure if that is the correct name) mounted right above the coil.
I'm not even sure it is still good actually LOL

Linda

[Nissanman]

I would expect that the EI coil is very efficient and that system doesn't require a suppressor fitted.
However, I've been wrong before
Usually, there is a radio noise suppressor fitted to the "A" or "+12V" terminal of the alternator ["-12V" for positive earth cars] and Ground.
This helps to remove alternator "whine" from the radio which is associated with rpm change.
Next time you are out and about, call in to your favourite Car Audio shop and ask them for a new one, they are only a couple of $$.
Perhaps ask them where they recommend they be fitted.
Static may or may not be generated by the engine.
Simple test is to switch the engine off if you are receiving static to prove where it is originating from.

[Linda]

Thanks Nissanman. Since the supressor is mounted by the coil, I will try connecting it to the + terminal and see what happens Sounds like they are a universal type part if the car audio guys have them, otherwise I think there is a part no. but not sure if Nissan still has them.

Linda

[fixitman04]

remember proper body grounding goes a long way in suppressing rfi noise. add some good grounds to the body directly to the neg on the battery. and from the frame to the engine. use a good 4 ga wire with soldered ends, clean the paint off of the mounting points and use some di-electric grease to prevent corrosion.

[Daryl Smith]

Resistor spark plugs are also recommended, if you haven't got them. NGK BPR6ES-11 (for the EI dizzy) iirc.

[datsunrides]

Solid core plug wires will also contribute to radio noise.

Mark

[dbrick]

Silly question...Has the radio always had static, or is this something new. If it's a new problem, see what changed, ground connection, new part added etc. You can also try unplugging the antenna and see if there is a difference.

[Linda]

I have the MSD wires, not sure if those are solid core. All the grounds are good, though there isn't one on the radio that I can see. The radio used to be clear a while back, and there has been a lot done since then. I did get some clearer sound recently but then lost it, so something isn't right.
Hopefully if it stops raining around here I can try some of the suggestions already given, especially the antenna.
Haven't really needed a radio as I am usually listening to be sure the engine sounds OK. LOL

Linda

[notoptoy]

Since it is somewhat intermittant I'd reallly suspect a bad ground somewhere, most likely at the antenna, Dave's suggestion is a good one.

[Nissanman]

Found this chart in one of my Service Manuals: -

Radio noise prevention chart.jpg

Might help you determine the source of the interference