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        General >> How to do things! >> Windscreen connections
        
(Message started by: Tompion on Feb 4^th, 2012, 10:47pm)

Title: Windscreen connections
Post by Tompion on Feb 4^th, 2012, 10:47pm

Details for windscreen replacement are here:
http://www.fordscorpio.co.uk/manual/windows/windscreen.pdf

There are 2 heated windscreen elements, one each side. They share relay 18 but the right-hand side uses fuse 38, the left-hand side fuse 41.
On each side there is a feed wire with a connector going to the bottom corners of the screen (the connection may be covered with shrink sleeving). There is also a black earth wire each side with no visible connection. If you want to clean the earth connections you will need to remove the A-pillar glass trims.

Clearly you need to check everything else first & there’s a fair chance the screen is faulty anyway.
In my case I found a slight resistance on the earth terminal but the real problem only reared its head after I’d gone to all the trouble – the bottom connection had come adrift & was only held in place by the screen adhesive.
It’s probably best not to disturb the wires attached to the screen too much.

The bottom of the rubber seal clips into these keyhole slots in the glass trim:

http://i.imgur.com/LDGdx17.jpg

Don’t remove this rivet – if the rubber does pull off the rivet it can be stretched back over the rivet & if necessary pushed back under with a blunt screwdriver:

http://i.imgur.com/wKos1uR.jpg

The seal pulled from the trim & the rivets drilled:

http://i.imgur.com/9H1uden.jpg

With the trim removed one of the earth terminals can be seen at the top of the screen:

http://i.imgur.com/M34ET94.jpg

I don’t know what the official readings should be but these are from my recently fitted screen.

With the engine & windscreen on, 14 amps per side. If you don’t want to disturb the shrink sleeve yet remove the fuses and test at the fusebox. Ensure your meter is capable of coping, mine has a time limit for readings between 10 & 20 amps.
Don’t forget the screen heater may have gone off between testing sides - off after 4 minutes.

http://i.imgur.com/rS8n8xO.jpg

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The resistance measured engine off between a disconnected positive windscreen terminal and battery earth was 1.4 ohms per side.