 | Home > In Car Electronics > CB Radio Activates Wipers on Transmit |
 
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| jon_a5 Member Since: 22 May 2016 Location: England Posts: 44   
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Hi,
Afraid this is all a bit new to me so it might be something really simple (hoping that is the case...) Trying to fit a CB radio into our defender, for now just planning to take the radio out when not in use as not sure where I want to mount it so opted for power from cigarette lighter rather than hardening. Got the antenna fitted and went to check the SWR, plugged in and all was fine, until pressed the transmit button, each time its pressed the windscreen wipers start going (link to video below) Does anyone have any ideas? I would rather not wire direct to battery and I havn't been able to find a spare switched live... https://www.youtube.com/watch?v=-An2XrRDhfk Thanks, Jon |
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20th May 2019 9:00pm |
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| NoDo$h Member Since: 18 Aug 2007 Location: Buried in deer guts in Dorset Posts: 972 
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Different
Have you checked the antenna is properly grounded, and the antenna cable doesn't have an internal short? Does the antenna cable pass close to the wiper relay? 
54 Freelander modded for mud 2008 D3 SE 2010 90 XS SW 1978 88 Series 3 undergoing surgery with a new owner 2007 90 County Truck Cab - gone 2006 D3 SE - gone 2004 Freelander Sport - gay 1999 Disco V8 ES rotted to bits |
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20th May 2019 9:16pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20347
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Foil works well as a temporary shielding, possibly there is a shared ground path too with reverse voltage through the wiper circuit.
Could be EMF triggering the relay as suggested above but it'd have to be pretty strong I'd have thought. Might be time to get the Multimeter out and test for any voltage leakage elsewhere on the wiper circuits when that stransmit button is pressed, you may then be able to track it down. You could try a different earth too, try temporarily earthing the CB at the battery. $W33T $0U7H3RN $UG4R 🇬🇧🏴🏴🏴🇮🇪🇺🇸⛽️🛢️⚙️🧰💪 |
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20th May 2019 9:22pm |
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| jon_a5 Member Since: 22 May 2016 Location: England Posts: 44
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Just realised I left some key information out sorry
It's fine when connected directly to the battery, so guess that rules out antenna cable / grounding etc? |
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20th May 2019 9:24pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20347
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Depends on where you made the connections for both polarities when the wipers come on.
Try a battery earth and power via the lighter feed I think you said. If it is fine it's the earth connection at fault, if not you know then it's the positive side of the lighter feed. It's a traceability issue in the existing circuits it seems, I assume the CB works perfectly directly connected to the battery so if that's the case you know that is not at fault. $W33T $0U7H3RN $UG4R 🇬🇧🏴🏴🏴🇮🇪🇺🇸⛽️🛢️⚙️🧰💪 |
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20th May 2019 9:41pm |
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| jon_a5 Member Since: 22 May 2016 Location: England Posts: 44
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Thanks for the help I took the "easy" route out and wired directly to the battery! All working as it should now.
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24th May 2019 8:08am |
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