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EFV-8 Club Forum / General Ford Discussion / 21A-18817-S - Roof Mount Antenna Wire

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Discussion Topic: 21A-18817-S - Roof Mount Antenna Wire

len47merc

07-06-2016 @ 11:35 AM

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Anyone know where one might find the short antenna wire (new or NOS) for a '41-'48 roof mount antenna part #21A-18817-S? Seems to be discontinued everywhere.

Steve

TomO

07-07-2016 @ 8:00 AM

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I don't remember any wire from the antenna to the radio and the install instructions don't show one.

http://www.ebay.com/itm/1946-Ford-Mercury-Radio-Antenna-Installation-Instructions-Brochure-wt9407-/291068553751?hash=item43c509aa17:g:9OwAAMXQlgtS6XR8

Tom

len47merc

07-07-2016 @ 8:26 AM

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Tom - it's the coaxial lead wire from the base of the antenna that leads to and plugs in to the top of the radio. It is not reflected on the installation instructions for the antenna. It is displayed by the part number I provided on most all of the Ford supplier's websites including Carpenter's, et al.

http://dennis-carpenter.com/radio-antenna-lead-wire/p/21A-18817-S/

Steve

This message was edited by len47merc on 7-7-16 @ 8:32 AM

TomO

07-07-2016 @ 9:09 AM

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It looks like standard connectors on both ends, a guy that repairs antique radios should be able to make you one.

Tom

len47merc

07-07-2016 @ 9:27 AM

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The original wire in the car was broken by a then over anxious, over zealous and impatient owner (as Alan would say ask me how I know that) when the radio was first removed for capacitor replacements. It has since been repaired but the radio is picking up excessive vibrational static &/or engine noise. My effort here is to rule out (and correct if necessary) the antenna ground, a possible loose antenna mount and/or the antenna wire itself as root causes. All noise suppression condensers are in place (coil, voltage regulator and ignition resistor mount) and have been validated for value.

I visited a local shop today to have a new lead fabricated with the terminals from the original wire.

Steve

trjford8

07-08-2016 @ 6:57 AM

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Not sure about the later cars, but the early cars had a suppressor on the gas tank sending unit also.

len47merc

07-08-2016 @ 8:50 AM

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Thanks trjford8. I recently helped a colleague with his '53 Ford Crestline Victoria's sending unit and noted one was present there as well. The installation instructions for the Adjust-o-Matic Zenith radio which came with the '47 only shows the three noted earlier and when pulling the original cork-float sending unit from this car's tank no signs of one ever having been there were evident. Doubt this was the case for this year but it is a good thought for me to keep in mind.

The previous owner, who had the car garaged/idled for ~40 years, indicated from his recall the radio did not exhibit the current static issues when he drove it in the 60's-70's, so I'm trying to rule out those things I know (personally and from prior input from the Forum/TomO) that may cause these issues before perhaps going down another condenser route, or pulling the radio again and sending it back for a warranty review/perhaps 'breaking-down tube' replacement.

Upon receipt the radio powered-up and all functions worked as designed (presets, floor-button channel changer, light, controls, etc.), but the radio only produced a hum. After pulling it and having it diagnosed, 9 of the paper/film capacitors were found to have failed over the years and were replaced as well as the vibrator. It now receives well and plays great as it should - it's just that under moderate acceleration and/or vibration I get intermittent and bothersome static that shouldn't be there.

As always - greatly appreciate your reply trjford8 -

Steve

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