Paul H Posted October 7, 2010 Share Posted October 7, 2010 I have just purchased a heated windscreen for the fender and am about to fit and wire it up. I will be ordering two of the PRC 7303 relays from LR series but the wiring diagrams i have from previous posts on this site talk about a timer unit. I cannot seem to find one listed on LR series. Does anyone know what unit i should be looking for and where best to get it? Quote Link to comment Share on other sites More sharing options...
Simon119 Posted October 7, 2010 Share Posted October 7, 2010 My link One scarily expensive Land Rover Timer Relay. I haven't bothered with this relay on mine, have just used a push to make switch so i have to hold the switch for it to work. Means i can't switch it on and leave it on by mistake, also saved me £60 HTH Simon Quote Link to comment Share on other sites More sharing options...
AndyO Posted October 7, 2010 Share Posted October 7, 2010 My link VWP do a heated rear window timed relay that may be of help - and is a touch cheaper than the Land Rover one!! Quote Link to comment Share on other sites More sharing options...
Paul H Posted October 7, 2010 Author Share Posted October 7, 2010 Wow that is scarily expensive. I think i might be investing in the VWP one. Many thanks for the replies Quote Link to comment Share on other sites More sharing options...
tuko Posted October 7, 2010 Share Posted October 7, 2010 Bought my timer relay on eBay, dirt cheap. Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted October 7, 2010 Share Posted October 7, 2010 I hope Paul won't mind me posting on here as it seems a bit silly to start another heated windscreen thread when there's already one running I've just bought the latest 2 connector type screen. Looking at the TD5 wiring diagrams in rave I've noticed that the main power supply for the relay is fed through a 30 amp fuse. Is it safe to assume then that I would only need a single 30 amp relay for it ? I got the impression from earlier threads with people using 2x 30 amp relays on the 3 tab screens that these draw heaps of power or are the new screens more efficient ? TIA Mo Quote Link to comment Share on other sites More sharing options...
Paul H Posted November 28, 2010 Author Share Posted November 28, 2010 So i am now finally ready to wire up the screen. The timer relay from VWP is to be wired as the diagram. Terminal 3 from the battery i will fuse with at least 20 amp. Would i be right in assuming terminal 4 +AC would come from something like the oil pressure switch so that it only operates with the engine running. 2 and 5 to earth and i assume 1 will feed the two 30 amp relays which i will use to power each side of the screen. I am getting a bit confused because the screen wiring diagram i have found which shows using a timer relay has different terminal numbers to mine. Any help would be grtatefully appreciated as i would like to get this wired soon now that winter appears to have arrived. I will also be using 30amp rated cable for live feeds. Timer relay.pdf Quote Link to comment Share on other sites More sharing options...
David Sparkes Posted November 28, 2010 Share Posted November 28, 2010 "The timer relay from VWP is to be wired as the diagram." Which bleeding diagram? You have attached a pdf and a jpg showing different layouts. As a point of principle, use one or the other, don't try to mix and match. You assume and assume and assume, because the diagram isn't clear. Go back to the supplier of the diagram and suggest they do the job properly. Force them to answer clearly the points which aren't clear to you. This stops us having to guess or assume for you, and tells the supplier that they supply carp information, thus giving them the chance to put it right, and make it suitable for purpose. We aren't paid to act as consultants to VWP. They charge enough for their products, make them supply the service you have paid for. Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted November 28, 2010 Share Posted November 28, 2010 Those are Land Rover wiring diagrams aren't they? Quote Link to comment Share on other sites More sharing options...
Challo Posted November 28, 2010 Share Posted November 28, 2010 Ayup, i'm after a heated windscreen for my defender. Could you please tell me where you got yours from? Cheers in advance. Quote Link to comment Share on other sites More sharing options...
V8 Freak Posted November 28, 2010 Share Posted November 28, 2010 I hope Paul won't mind me posting on here as it seems a bit silly to start another heated windscreen thread when there's already one running I've just bought the latest 2 connector type screen. Looking at the TD5 wiring diagrams in rave I've noticed that the main power supply for the relay is fed through a 30 amp fuse. Is it safe to assume then that I would only need a single 30 amp relay for it ? I got the impression from earlier threads with people using 2x 30 amp relays on the 3 tab screens that these draw heaps of power or are the new screens more efficient ? TIA Mo Mo, Mine runs through 40 amp fuse and I use a 70 amp relay just in case.... Neil Quote Link to comment Share on other sites More sharing options...
nickwilliams Posted November 28, 2010 Share Posted November 28, 2010 In reply to Paul H, the VWP relay is not a direct replacement for the Landrover part and works in a different way. The reason for this is that the rear windscreen heater which the VWP relay is designed for only takes about 75W (~7A) and so it is less critical to turn it off when it is not needed, whereas the front windscreen heater on the Defender is about 300W (25A) so you really only want it on for a short time and only when the engine is running or you will end up with a flat battery, particularly if you are using the vehicle at night. The Landrover windscreen timer uses the signal from the oil pressure light switch to confirm that the engine is running, as well as only allowing the heated windscreen to run for about 10 minutes after the switch is pressed. This ensures that the great unwashed who don't understand the first thing about vehicle battery loadings can't leave the heater on forever and then complain when there isn't enough juice in the battery to start the engine from cold the following morning. However, for anyone who does have an inkling about battery loadings, it really isn't too much to expect them to only run the heater for a short time and remember to switch it off manually. The VWP relay has no means to detect whether or not the engine is running - it's just a relay with a timed latch. You can achieve the engine run detection by powering the WVP relay off the voltage sensitive switch which is already fitted on the 2.5TD - 300TDI models as part of the heated rear window circuit. In fact, I'm also about to fit a heated windscreen in my 90 and I intend to run it off a relay which I will activate from the heated rear windscreen circuit. The power side of the relay will come from the battery via a 30A fuse. This means that the front and rear windscreen heaters must be on together or not at all. Since I hardly ever use the rear one (in fact I don't think it's been working for quite a while) I can't see a problem with this, and I like the idea of not having to add any more switches or controls to my dashboard. If you want to ry to make the front and rear heaters independent of one another then you will need a separate switch for each one (obviously) and you will also need to do a bit of jiggery-pokery with the wiring for the voltage sensitive switch. ICBA to advise on that at this time of night having been out in the cold all day re-building my rear tub, but drop a reply to this post if you need more advice and I'll see what I can do for you tomorrow. Nick. Quote Link to comment Share on other sites More sharing options...
Paul H Posted November 29, 2010 Author Share Posted November 29, 2010 Hi Nick, Thanks for the info. That certainly explains things a bit better. I have a mud console and have already got a switch for the screen fitted to it so will be looking to go down that route. I am happy not to use an engine running supply as i have wired the switch with a warning light and am pretty anal about switching things off (been caught to many times when younger). Just need to get my head round powering the two feed relays from the timer one. Quote Link to comment Share on other sites More sharing options...
RustyNissanPrairie Posted November 29, 2010 Share Posted November 29, 2010 My Winterised military 110 has a heated screen as standard that is operated by an illuminated switch next to the 6way military lighting switch, no timer, only works with ignition on. Not flattened a battery yet. Quote Link to comment Share on other sites More sharing options...
Challo Posted November 29, 2010 Share Posted November 29, 2010 Could anyone tell me where to get a heated defender screen from? Cheers Quote Link to comment Share on other sites More sharing options...
WarPig Posted November 29, 2010 Share Posted November 29, 2010 Challo, Ive not used them myself, but this company sells them... http://www.heatedwindscreen.com/acatalog/land-rover-heated-windscreens.html This company used to sell them, but their site is under development currently.. http://www.beamends-lrspares.co.uk/ and this is worth reading.. http://www.lrm.co.uk/Archive%20Index/Technical/Fitting%20a%20Heated%20Screen/fittingaheatedscreen.html Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted November 30, 2010 Share Posted November 30, 2010 Mo, Mine runs through 40 amp fuse and I use a 70 amp relay just in case.... Neil Cheers Neil Mo Quote Link to comment Share on other sites More sharing options...
Challo Posted November 30, 2010 Share Posted November 30, 2010 Thanks for that Warpig. Much appreciated. Cheers Chris. Quote Link to comment Share on other sites More sharing options...
Paul H Posted December 1, 2010 Author Share Posted December 1, 2010 Can one of the wiring gurus have a look at this and see if they think it might work Microsoft Word - My wiring attempt.pdf Quote Link to comment Share on other sites More sharing options...
Off Road Toad Posted December 1, 2010 Share Posted December 1, 2010 Ayup, i'm after a heated windscreen for my defender. Could you please tell me where you got yours from? Cheers in advance. I got mine on my insurance when they asked over the phone if it was heated the word 'yes' just slipped out cost me £25 excess and a little bit of wiring which i did myself. no one ever questioned it. Steve Quote Link to comment Share on other sites More sharing options...
nickwilliams Posted December 1, 2010 Share Posted December 1, 2010 Can one of the wiring gurus have a look at this and see if they think it might work No, you've got the battery shorted through the VWP relay if you do that. If you're lucky you'll blow the fuse. If you're unlucky you will set fire to the relay. Not got time to provide an updated diagram right now, but will get back to you later. What did you do your diagram in? It might be easier to modify what you have done than produce a new one. Nick. Quote Link to comment Share on other sites More sharing options...
Challo Posted December 1, 2010 Share Posted December 1, 2010 I got mine on my insurance when they asked over the phone if it was heated the word 'yes' just slipped out cost me £25 excess and a little bit of wiring which i did myself. no one ever questioned it. Steve Much appreciated for that Steve, i like your way of thinking. Think i'll give that a whirl and when they ask if its tinted, who knows another yes might slip out too. Cheers Chris. Quote Link to comment Share on other sites More sharing options...
nickwilliams Posted December 1, 2010 Share Posted December 1, 2010 This is the simplest way of wiring up the windscreen with a rear window timer from VWP: Note that there is a minor error in this drawing, in that the connection from the windscreen to the chassis needs to be in 30A wire as well as the +ve feeds. Nick. Heated_Rear_Screen.pdf Quote Link to comment Share on other sites More sharing options...
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