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#1
08-30-2020, 09:51 PM
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Antenna Fun '83 300TD Wagon..
Hey folks,
I've got a working Hirsch bench tested antenna from a reputable dealer. Why do I get +12V to pin 5 & 6 with the ignition off? They're only supposed to be activated with the switch. I pulled the switch from the dash and I get the same reading. I get +12V at pin 1 with the ignition off which is normal. Now I can't get the radio to turn on...fuse is good. Help appreciated! Last edited by dendiggity; 08-30-2020 at 11:27 PM. 
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#3
08-31-2020, 09:14 AM
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Many years ago, I was presented with a 1983 300D that had experienced the original Hirschmann antenna being replaced with something else and the associated wiring and connectors having been destroyed. The approach I chose and the one I would choose in this case if I owned the situation is as follows:
For a definitive diagnosis and corrective action (if necessary), consider referring to, studying, understanding, and following the electrical schematic for the circuit.
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#4
08-31-2020, 09:30 AM
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Lol I I thought the guy above me was gonna get to some amazing point... Haha
__________________
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#5
08-31-2020, 02:16 PM
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Wow! Some real wizards on this forum...
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#6
08-31-2020, 02:31 PM
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See diagram 115 in the ETM:
https://www.startekinfo.com/StarTek/outside/12265/disc_2/program/ETM/83_300.pdf From the diagram, it would appear that power is supplied to the switch from the radio. Possibly the radio has an internal fault.
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Current stable: 1995 E320 157K (Nancy) 1983 500SL 125K (SLoL) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) Gone and wanting to forget: 1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]
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#7
08-31-2020, 02:34 PM
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Hirschmann Antennas
They're often only needing some cleaning and a new mast to work perfectly again .
The damned Foster boys keep bending the antennas in my graymarket '84 300TD, I need to replace it yet again . I'm told the Uro brand replacement masts are worthless . Originial ones are still available from Pelican Parts at a fraction of the deal co$t .
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-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better
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#8
08-31-2020, 02:36 PM
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FWIW,
Any red wire anywhere in the entire car should, nee must be live at all times , the circuit # is 30 .
__________________
-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better
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#9
09-03-2020, 10:06 PM
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SOLVED!
In-line glass fuse behind stereo was blown. Replaced and everything works. Antenna wires: Pin 1 (blue) +12v Pin 2 (green/yellow) Trigger (+12-lifts antenna, no voltage-drops antenna) Pin 3 (brown) Ground Pin 4 NC - No Connection Pin 5 (black) NC-Medium Extention, Jumper to Pin 6-Full Extension Pin 6 (black) NC-Medium Extention, Jumper to Pin 5-Full Extension Over and out. Thanks for the help folks!
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