Home > Puma (Tdci) > Rear screen heater switches brake lights on, hmmmmmm |
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Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6601 |
Removing the ground from the rear screen element causes current to flow to ground through the brake lights circuit, as the centre brake light and the element share a ground track on the window, which you've disconnected. This is expected.
What resistance are you measuring for the element. You say there is continuity, but it shouldn't be zero Ohms. Check the resistance of the ground wire itself (not the terminal on the element) back to the battery negative, in case this is broken or high resistance. You're getting voltage supplied, but haven't checked the path to ground. 1988 90 Td5 NAS soft top 2015 D90 XS SW |
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22nd Dec 2020 10:49am |
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blurry Member Since: 20 Oct 2020 Location: Wales Posts: 5 |
Hi Martin, thank you, after reading your reply about rear screen to ground brake lights that makes total sense now, as it goies through the high level brake light bulb.
How to check the ground cable all the way back to the battery? multimeter ground to the battery terminal and multimeter positive to the end of the ground cable at the rear window end? Set to what ohms? Thanks again. |
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22nd Dec 2020 2:07pm |
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llessur Member Since: 15 Nov 2011 Location: Hereford Posts: 151 |
I had exactly the same happen, and thanks to Martin, I found a broken earth wire in the convoluted rubber grommet that goes to the door.
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22nd Dec 2020 4:04pm |
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