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PCM



Member Since: 25 Jan 2019
Location: North East
Posts: 874
United Kingdom 
Low voltage at reverse light
A bit of a puzzle this one.
I seem to be getting only 7v at the rear reversing light. 110 2014.
Never noticed this before but after fitting a reverse camera that turns on when in reverse it sometimes works and sometimes doesn't.
I'm assuming it's an earth but no idea where to check.
Could it also be the reverse switch.
Anyone any ideas on the best way to do a bit of fault finding as it's quite annoying..

Cheers
PCM
Post #932572 5th Dec 2021 11:23pm
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3414
Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
I am assuming you measured 7V across the bulb...

To be able to confirm if it is an earth issue or not, find a good earth point (or if you are unsure, run a wire directly to the battery negative trrminal) and with ignition on and in reverse, measure the voltage on both sides of the bulb.

If one side is 7v and other side is 0V, then you have a supply issue.
If one side is 12v and other side is 5V, then you have a ground issue. Note that actual voltages you measure depends on battery state, but you get the idea.

Hope this helps. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #932576 6th Dec 2021 1:56am
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5697
2006 Defender 110 Td5 USW Zermatt Silver
It’s known for the tdci reverse light switches to play up, and that would be worth considering.

Get underneath unplug reverse switch, bridge the terminals, does light work? Then test switch for continuity
Post #932587 6th Dec 2021 7:28am
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PCM



Member Since: 25 Jan 2019
Location: North East
Posts: 874
United Kingdom 
Bought a genuine reverse switch and while doing some soundproofing took off the cover under the cubby box.
Turns out that there was a plug above the gear box that had worked itself loose. Not really sure what it does but wonderfully when I plugged it back in the camera started working. 🙈
Turns out it wasn’t the reverse switch. But something far simpler. For once…
Post #938012 17th Jan 2022 12:06am
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