66 radio capacitors how do I check them? - Page 2 - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #16 of 20 (permalink) Old Jul 8th, 18, 9:28 PM
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Randy
 
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Re: 66 radio capacitors how do I check them?

Jim, does your AM reception crackle with the engine running or just with the XM transmitter? You can try adding a 3MF capacitor from the feed for the cig lighter to ground to see if you get some improvement. Some of these transmitters are really sensitive to ignition noise. Is the connection from your transmitter to the radio wired with shielded wire? Post the model number of your transmitter, maybe we can glean some info about proper grounding techniques for it.

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post #17 of 20 (permalink) Old Jul 8th, 18, 9:55 PM
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Re: 66 radio capacitors how do I check them?

Those 2 caps are for noise suppression. If they were bad you would get a buzzing noise that will change with RPM.

Your just jealous because you can't hear the voices!

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post #18 of 20 (permalink) Old Jul 9th, 18, 8:31 AM Thread Starter
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Re: 66 radio capacitors how do I check them?

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Originally Posted by oldcutlass View Post
Those 2 caps are for noise suppression. If they were bad you would get a buzzing noise that will change with RPM.
So you are saying that as I increase the rpms, if I get no bussing noise the capacitors should be good to go?
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post #19 of 20 (permalink) Old Jul 9th, 18, 8:38 AM Thread Starter
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Re: 66 radio capacitors how do I check them?

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Originally Posted by pnugene View Post
Jim, does your AM reception crackle with the engine running or just with the XM transmitter? You can try adding a 3MF capacitor from the feed for the cig lighter to ground to see if you get some improvement. Some of these transmitters are really sensitive to ignition noise. Is the connection from your transmitter to the radio wired with shielded wire? Post the model number of your transmitter, maybe we can glean some info about proper grounding techniques for it.
Never tried the AM connection, only the FM, I will try that. I don't think there is a connection from the transmitter to the radio, it just plugs into the cigarette lighter no wires any where. I will post the number of the transmitter along with a photo later today. The feed from ignition to the cigarette light is kind of short and truck way up there under the dash and a difficult access.
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post #20 of 20 (permalink) Old Jul 9th, 18, 9:07 AM
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Re: 66 radio capacitors how do I check them?

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Originally Posted by Jim_66SS View Post


So you are saying that as I increase the rpms, if I get no bussing noise the capacitors should be good to go?
Yes.

There is a trim pot that you can adjust/tune. Scroll down to trimmer adjustment.
https://www.chevelles.com/radiotech/reception.html

Your just jealous because you can't hear the voices!

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