Under Dash Electrical Question

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Aug 21, 2010 | 12:40 PM

Ray Y

Thread Starter

Burning Brakes

Joined: Sep 2006

Posts: 1,242

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From: Kalispell MT

Under Dash Electrical Question

I'm chasing an electrical gremilin that has recently popped up related to my stereo. Stereo works fine as long as the engine is off, but after engine is started the CD player and USB port music sounds like it is skipping....it worked fine until about 2 weeks ago. Anyway I was under the dash this AM and noticed this component just hanging loose by it's connector, when I touched it the resistor fell off the wire. It goes to a fairly large gauge brown wire and it appears to terminate right at this component. The end of the component is stamped with a big "DR" in the center with 801249 over that and .5 MF below it. I assume this means it's a 0.5 micro-fared resistor. Is this correct? What does it go to/what circuit is it in? (The only thing I see on the wiring diagram that might be it is a 12 BRN wire going to a RDO CAPAC) If I replace it what are the odds it will eleiminate the noise in the stereo circuit?

This is the component:

This is were it was plugged in:

Aug 21, 2010 | 12:57 PM

Ray Y

Thread Starter

Burning Brakes

Joined: Sep 2006

Posts: 1,242

Likes: 12

From: Kalispell MT

Forgot to say, this is a 1970.

I looked in one of the parts catalogs and the only capacitors is see for the 1970 are the:
Ignition Coil Capacitor
Distributor Capacitor

Brake Light Switch Capacitor (shown no longer available)
Heater Blower Motor Capacitor (I know it's not this one)

Thanks in advance guys!!

Aug 21, 2010 | 01:33 PM

Duke94

Le Mans Master

Joined: Mar 2001

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From: Ann Arbor Michigan

Looks like the noise suppression capacitor for the radio. Won't effect radio function if unplugged but you'll get some noise.

Gary

Last edited by Duke94; Aug 21, 2010 at 01:36 PM.

Aug 21, 2010 | 02:05 PM

Mr.Gearhead

Burning Brakes

Joined: Jun 2000

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From: GA

Quote:

Originally Posted by Duke94

Looks like the noise suppression capacitor for the radio. Won't effect radio function if unplugged but you'll get some noise.

Gary

My wire fell out of mine... can't notice the radio noise due to the 280H cam rumbling around... no worries on this one!

Aug 21, 2010 | 03:03 PM

dembo

Burning Brakes

Joined: May 2007

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From: Lokeren, Belgium

Hard to read the picture It's connected to the 12 brown from the starter switch and is noise suppressor for the radio
Nick

Aug 21, 2010 | 11:01 PM

Ray Y

Thread Starter

Burning Brakes

Joined: Sep 2006

Posts: 1,242

Likes: 12

From: Kalispell MT

Thanks for the pointers guys. This makes sense with the diagram I was looking at then, RDO is short for RADIO and CAPAC short for CAPACITOR.

Also since this thing was just dangling in the air, does it have to be mounted for a case ground to function properly?

The catalogs I have don't list a radio capacitor for 1970, any source that you are aware of where I can get one?

Aug 21, 2010 | 11:19 PM

speedreed8

Melting Slicks

Joined: Oct 2006

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From: Texas

might try lectriclimited.com, they show a radio capac. for 70 vette. , not sure if its the right one.

http://www.lectriclimited.com/mainpage.htm

Aug 21, 2010 | 11:39 PM

Ray Y

Thread Starter

Burning Brakes

Joined: Sep 2006

Posts: 1,242

Likes: 12

From: Kalispell MT

Quote:

Originally Posted by speedreed8

might try lectriclimited.com, they show a radio capac. for 70 vette. , not sure if its the right one.

http://www.lectriclimited.com/mainpage.htm

Thanks for the link to LectricLimited, I had forgot about these guys. Their description for the '70 radio capacitor says it mount to the coil however so I need to call them I guess.

I see you are in Tyler, I lived in Longview for several years growing up.
Thanks again for the lead.