Humbug
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 posted on 3/10/09 at 05:38 PM |
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Heated screen wiring
OK, just bought a heated screen and put it on the car. I am wondering whether to connect the heater bit, but not sure what actually is needed. I have
a spare switch on the dash which is currently connected to the engine fan *just in case* but I've never needed to use it. Do I need a relay for
a heated screen and, if so, how would I wire the thing into the loom?
Any help gratefully received.
Simon
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BenB
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| posted on 3/10/09 at 05:45 PM |
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First thing it to probably connect it up across 12v and see what current it pulls with a multimeter. That'll fundamentally specify whether you
can use a loom connection or a seperate relayed supply. If you haven't got a multimeter try connecting it via various ampage fuses (ie 1A, 3A,
5A). That'll tell you approx what ampage is being pulled by which ampages blow!!)...
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Ben_Copeland
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| posted on 3/10/09 at 06:05 PM |
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Another point to consider is a timer circuit.... so it doesnt stay on for too long.
My mondeo has timer circuits on both screens.
I'd recon you'll need 25amp circuit which means a relay !
Ben
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britishtrident
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| posted on 3/10/09 at 06:21 PM |
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Tintop HRW are always wired through a relay
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Humbug
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| posted on 3/10/09 at 06:31 PM |
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OK... so it looks like a relay is needed. How to I actually wire it in (in simple terms): wire from a fuse to the relay to the screen? wire from the
other side of the relay to the switch? + earths?
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madrallysport
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| posted on 3/10/09 at 06:42 PM |
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Basic relay wiring diagram
UNDERSTEER is when you hit the wall with the front of the car.
OVERSTEER is when you hit the wall with the rear of the car.
HORSEPOWER is how fast you hit the wall.
TORQUE is how far you take the wall with you.
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Mark Allanson
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| posted on 3/10/09 at 06:48 PM |
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When I stripped my sierra ghia donor, the wires to the heated front screen were the thickest I have ever seen on an automotive circuit that did not
involve a starter motor!
BIG relay required
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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Humbug
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| posted on 3/10/09 at 07:50 PM |
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Thanks peeps
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Humbug
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| posted on 9/10/09 at 09:43 AM |
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Just called Caterham to say I had got a heated screen s/h from "another owner"  and what rating relay and fuse do I need to fit?
Parts Dept said "dunno" and put me through to Engineering, and the answer is... No relay (!) and just a 10A fuse.
I have to say that the wires coming from the sides of the screen don't look particularly thick, so maybe (hopefully) that is correct.
Has anyone else got a Caterham heated screen and can confirm/rebut this?
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Ben_Copeland
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| posted on 9/10/09 at 10:06 AM |
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Guess they just use a beefyish switch instead.
Ben
Locost Map on Google Maps
Z20LET Astra Turbo, into a Haynes
Roadster
Enter Your Details Here
http://www.facebook.com/EquinoxProducts for all your bodywork needs!
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Marcus
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| posted on 9/10/09 at 07:22 PM |
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Yup, I'm running a Caterham heated screen, and no I don't use a relay. It hasn't blown a 6 amp fuse yet, so I wouldn't worry
Marcus
Because kits are for girls!!
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Humbug
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| posted on 10/10/09 at 09:33 PM |
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quote:
Originally posted by Marcus
Yup, I'm running a Caterham heated screen, and no I don't use a relay. It hasn't blown a 6 amp fuse yet, so I wouldn't worry
Good news!
Simon
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