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DISCO3.CO.UK > Technical (D3)

Heated windshield/windscreen - perlexed
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jekyllman
 


Member Since: 27 Dec 2020
Location: Pocatello
Posts: 42

United States 2005 LR3 4.4 V8 HSE Auto Bonatti GreyLR3

Alright so I’ve tested the ground wire for continuity to a bolt on the frame and also directly to the negative terminal on the battery. Leads together give 0.0 ohms. To the battery neg terminal it measures 0.2 ohms.

I also tested voltage drop while running and windshield powered on. Battery around 14.07V and windshield about 13.78V. I’m not 100% happy with that but I’d imagine it’s sufficient.

I’m feeling pretty good about the power supply side and the ground connection, to be honest. Now my issue is with the windshield itself. I measure resistance and this is what I get…but don’t understand why

https://imgur.com/a/OgobSpS  
Post #227503226th Jan 2022 6:37 am
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10492

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

resistance should be measured with at least one of the car wires disconnected, so it's not reading the other side of the windscreen or anything else.

as I said above, I would expect a good one to measure nearer 1R

Measure the good side to prove it to yourself and prove your meter works etc.

What you are seeing there is some sort of capacitance effect  
Post #227508026th Jan 2022 1:16 pm
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jekyllman
 


Member Since: 27 Dec 2020
Location: Pocatello
Posts: 42

United States 2005 LR3 4.4 V8 HSE Auto Bonatti GreyLR3

This was done with both side disconnected from the vehicle. Also, I measured the good side and it immediately went down to near 0 ohms. So there was a difference; I just don't understand the physics of the capacitance behavior you're referring to. Because it seems there is a closed circuit, although not a good one...  
Post #227512526th Jan 2022 5:53 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10492

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

it is weird

maybe you broke the DMM Laughing

but if one side is doing it differently and going down to zero, that explains it  
Post #227513826th Jan 2022 7:23 pm
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zig
 


Member Since: 09 Sep 2005
Location: Scotland
Posts: 631

United Kingdom 2006 Discovery 3 TDV6 SE Auto Bonatti GreyDiscovery 3

With the heated windscreen on, at the connectors on the screen, have you measured the voltage across the left and right heating elements?

If so what voltages did you measure?  
Post #227581230th Jan 2022 1:13 am
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jekyllman
 


Member Since: 27 Dec 2020
Location: Pocatello
Posts: 42

United States 2005 LR3 4.4 V8 HSE Auto Bonatti GreyLR3

Both were identical: 14.1v  
Post #227582330th Jan 2022 3:09 am
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aja4x4
 


Member Since: 14 Apr 2019
Location: Westbury
Posts: 2462

United Kingdom 2005 Discovery 3 TDV6 SE Auto Zambezi SilverDiscovery 3

I think you have a faulty windscreen Andrew

D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE  
Post #227583230th Jan 2022 9:14 am
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