DIY heated windscreen loom

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Skolmate

Skolmate

Active Member
Posts
168
Location
Manchester
Just had a heated windscreen fitted into my 200tdi 110. Is it possible to use a spotlight loom or piggy back off the rear heated windscreen so that I do not have to spend £120ish on an official windscreen loom?
Cheers
 
appropriate sized cable fused direct from battery through an approproate rated switch - to the screen.

job done.

what the red bison kit gives ( and i have it fitted) is a programable timer and auto cut off so you dont leave it on accidentally and flatten your battery.
 
Skolmate said:
Just had a heated windscreen fitted into my 200tdi 110. Is it possible to use a spotlight loom or piggy back off the rear heated windscreen so that I do not have to spend £120ish on an official windscreen loom?
Cheers
Click to expand...

Check the rating of the windscreen, get a relay (timed?) big enough plus 5 or 10 amps (always over engineer electrics) and some wire to suit, make up a small tail from an adequate source, personally I would use a known 80A supply I ran to the engine bay for accessories, if you have no such thing you could take a wire from the starter where the battery connects or the alternator or best bet run one from the battery box, fuse it almost immediately - a wire of that size un-fused is called a firelighter.

Run this up to your relay and then the switched side onto your windscreen. Ideally putting it in the battery box will let you have a short run, a fuse then the relay down in the battery box neatly mounted on the side, then just run a small wire for switching and a big wire to the screen up to the dash area, deck the screen locally to a good earth using an appropriate sized wire, deck the relay in the battery box and take an ignition switched live from up where you mount your switch. Take that ign live via your switch onto your relay switch wire so when you press it the relay activates and powers your screen.

Personally I would invest in a 10 minute relay and use use a push to make switch, hit it once and the relay will stay on for 10 minutes.

The above is perfectly adequate and safe way of doing it, if you prefer you can loom it all up to have both switch wires and L and N feed to the screen all loomed together back to the battery box.
 

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discomania said:
check the rating of the windscreen, get a relay (timed?) big enough plus 5 or 10 amps (always over engineer electrics) and some wire to suit, make up a small tail from an adequate source, personally i would use a known 80a supply i ran to the engine bay for accessories, if you have no such thing you could take a wire from the starter where the battery connects or the alternator or best bet run one from the battery box, fuse it almost immediately -
a wire of that size un-fused is called a firelighter.
Click to expand...

run this up to your relay and then the switched side onto your windscreen. Ideally putting it in the battery box will let you have a short run, a fuse then the relay down in the battery box neatly mounted on the side, then just run a small wire for switching and a big wire to the screen up to the dash area, deck the screen locally to a good earth using an appropriate sized wire, deck the relay in the battery box and take an ignition switched live from up where you mount your switch. Take that ign live via your switch onto your relay switch wire so when you press it the relay activates and powers your screen.

Personally i would invest in a 10 minute relay and use use a push to make switch, hit it once and the relay will stay on for 10 minutes.

The above is perfectly adequate and safe way of doing it, if you prefer you can loom it all up to have both switch wires and l and n feed to the screen all loomed together back to the battery box.
Click to expand...
:d
 
i made my own loom with and used heated screen timer relay and a standard relay and some appropriate wiring. there are loads of wiring diagrams if you google. i did make one mistake, i put the positive connection on the passenger side of the screen and that side clears first.
 
I had windscreen cover so paid the excess of £90. I think the screen retailed for about £130 I think from Pilkinton.
Paddocks want £125 ish for the loom.
I'll have a go at doing my own I think. And positive on drivers:)
 
Skolmate said:
I had windscreen cover so paid the excess of £90. I think the screen retailed for about £130 I think from Pilkinton.
Paddocks want £125 ish for the loom.
I'll have a go at doing my own I think. And positive on drivers:)
Click to expand...
Thanks! Yes, I have windscreen cover, so I've been thinking about using that. However, don't feel totally comfortable with doing it. :)
 
Good stuff!
I may be missing something Joker but why wouldn't you?
The insurance company were a little slow on the uptake and couldn't understand why I wanted a screen with nothing to plug into it, but we got there in the end. I had to explain I didn't care that before a loom was connected the heating function didn't work.
 
Skolmate said:
Good stuff!
I may be missing something Joker but why wouldn't you?
The insurance company were a little slow on the uptake and couldn't understand why I wanted a screen with nothing to plug into it, but we got there in the end. I had to explain I didn't care that before a loom was connected the heating function didn't work.
Click to expand...
Two reasons; 1) My screen isn't broken. Maybe I could argue that the milky edges and the few tiny tiny chips and general wear might warrant a new screen. 2) My current screen is not heated, so getting an "upgrade" seems a bit dodgy. Maybe I'm missing something? :)
 
I'm in the same boat, my screen is on its way out (milky edges, chips) and would replace it with a heated one if I'm swapping it anyway. I guess it's something that wouldn't be too common, and since the company replacing the screen will not likely not be too worried what they're fitting, as long as the insurance company will pay them, it should be fine.

However, what happens if they pick up on what you're doing.....I don't know how likely that is or whatever.

I've seen a few on ebay now and again from birmingham area for £115 (heated), I'm considering going for one of those once I've got my landy back together (galv chassis arriving in about half an hour!)
 
gse1986 said:
I'm in the same boat, my screen is on its way out (milky edges, chips) and would replace it with a heated one if I'm swapping it anyway. I guess it's something that wouldn't be too common, and since the company replacing the screen will not likely not be too worried what they're fitting, as long as the insurance company will pay them, it should be fine.

However, what happens if they pick up on what you're doing.....I don't know how likely that is or whatever.

I've seen a few on ebay now and again from birmingham area for £115 (heated), I'm considering going for one of those once I've got my landy back together (galv chassis arriving in about half an hour!)
Click to expand...
Please keep us posted on what you'll end up doing. :)
 
Cheers for all the tips guys.
Mine was hit by a big stone so needed replacing, so why not help out the c**p heater with a heated screen.
The fitter turned up with what must have been a britpart seal. I did try & tell him & after an hour of trying came back with one from he's normal supplier.
Fitted it with a 10 min relay & an LED to show it's on.
Now just looking forward to the winter :)
 
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