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jon_a5

Member Since: 22 May 2016
Location: England
Posts: 44

2016 Defender 90 Puma 2.2 XS CSW Montalcino Red

CB Radio Activates Wipers on Transmit

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

20th May 2019 10:00pm

NoDo$h

Member Since: 18 Aug 2007
Location: Buried in deer guts in Dorset
Posts: 972

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

20th May 2019 10:16pm

jon_a5

Member Since: 22 May 2016
Location: England
Posts: 44

It is indeed! Use to my Range Rover doing all sorts of funny electrical tricks but the defender is usually fully functional!

Not sure about grounding, the mount came with the cable attached? Maybe I am missing something though? As I say new to CB radios... Any suggestions how to check for a short?

Antenna cable runs through the back door above the hinge, then down the rear window behind the plastic and behind the plastic underneath the side windows so think its far away from the relays.

20th May 2019 10:20pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19535

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. Diesel$ Live$ Matter. ⛽️🛢️👨‍🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧

20th May 2019 10:22pm

jon_a5

Member Since: 22 May 2016
Location: England
Posts: 44

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?

20th May 2019 10:24pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19535

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. Diesel$ Live$ Matter. ⛽️🛢️👨‍🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧

20th May 2019 10:41pm

jon_a5

Member Since: 22 May 2016
Location: England
Posts: 44

Thanks for the help I took the "easy" route out and wired directly to the battery! All working as it should now.

24th May 2019 9:08am

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