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Discussion Starter #1
I want to change the radio noise condenser in my 69 Tbird, because when idling or accelerating, the old AM/FM Radio has annoying background noises in FM mode depending on the current RPM.
I already have a new capacitor laying here, but can't figure out where to install it. Hope you can help me?!
Thank you!
 

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Discussion Starter #4
I can't figure it out.
The alternator regulator is mounted directly to the alternator itself, right?
But there are only two wires coming from it. I will post a picture later.
 

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Should be on the passenger side fender well just aft of the starter solenoid if memory serves me right.
 

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Discussion Starter #6
That's mounted passenger side to the fender well, close to the hood support.

Here a picture of it with the screw off:

Wires come from a red plug which leads to the inside. Wires from the starting motor relay lead to the inside too
 

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That is alternator noise. A few things will cause that. Bad ground in the fender antenna.
Bad ground in the radio case. Bad alt. radio suppressor. week F.M. signal. I think your
biggest problem is your 47 year old radio. What you are hearing is the A.C. hum from
your alternator before it gets to the rectifier. Your alternator is 3 PH. and it will sound like a high pitched whine. Well you know what it sounds like. Your radio has built in filter caps
that filter out that type of noise and i'll bet they are dried out and don't do their job. You
can take the power feed wire off the ignition switch and connect it directly to the battery.
That usually helps but you have to remember to turn off the radio when you shut off the
car or you will have a dead battery the next morning. good luck.
 

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Discussion Starter #10
Thank you very much! I will try that.
You mean the power cable from the radio should be mounted directly to the battery and not to the ignition switch, right?
 

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Yes, right. Worse gets to worse. Install a new radio. When we were kids some of us had
that problem and replacing the alternator fixed it. They have their own built in suppressers. Generators in the " old " cars were D.C. and didn't cause that problem. They also made a filter for that specific problem. It was the size of a C cell battery and about 4 inches long. Connected directly between the main alternator wire that came out the back of it and the battery. Kind of worked. I still say your main problem is your radio. You could replace all the filter caps. in it. They are usually 100mf - 220mf at 16 - 50 volts. Almost all after market radios and C.B.s are supposed to be connected directly to the battery and not the ignition switch. They forget to tell you that. Hope you get it sorted. Need any more help please feel free to contact me. Take care.
 

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Discussion Starter #12
I´ve already ordered that radio noise suppressor condenser:

Part # C6AZ-18827-A

Should I mount that between alternator and battery? Moreover I´ll mount the radio directly to the battery.
 

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If I remember correctly that condenser goes inside the alternator across the negative and
positive rectifier bridge. That could also be the diode trio. I'm kind of thinking that is what
it is. Memory fails me. I've seen hundreds of those when I was on the bench and never
replaced one. Anyway that is installed inside the alternator.
 

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Discussion Starter #14
So you think the condenser could solve the problem?
Do you know the part # of that thing between battery and alternator?
 

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Ford never made one. Your condenser is , was , found at part stores, electronic stores,
car stereo shops. Try finding a store that still sells C.B. radios. They might have what
your looking for. Myself, I haven't seen one of those in 50 years. They don't always work
but do cut down on some noise. If you have a scope you could connect it to the
alternator, find the frequency and get the proper cap. to filter out your noise but I
think your better off with a new radio. The new ones come with a built in suppressor
built into the power cable. Good luck.
 

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check out after market replacement stores. Something like Summit Racing, but not them
themselves. Other shops specialize in replacement radios with the old school face plates
that have brand new guts. They are brand new up to date radios with the old school look.
You see these guys on Hot Rod T.V. all the time. Problem is I've never seen one for
a Ford radio but you never know. Or send your old radio out for repair.
 

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If you decide to replace this condenser DO NOT loose or forget to install any of
the insulators on the + rectifier bridge. The large stud. If you do your alt will go
up like a roman candle and probably most of your wiring. When you put the brush
rigging back you have to load the brush holder or you will snap the brushes in half.
Don't loose the brush springs. They will go flying when you pull out the rotor.
Ford alts are not easy to work on. I don't like them. The rectifier bridge
and stator come out in one piece. Your stator stud will also have insulators so don't
loose them. That is the black one. Some are white. Do not over tighten when assembling.
You will break the plastic insulators. If that is the original alt your plastic insulators
are very brittle and could crumble to powder. Been there done that. Good luck.
 
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