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Jul 8^th, 2024, 1:27am

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   heated front screen 24v

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Topic: heated front screen 24v (Read 2540 times)

Cosray
Full Member

8th Scorpio, 2nd Cosworth: currently '95

Posts: 569

Re: heated front screen 24v
« Reply #20 on: Mar 6^th, 2009, 11:30pm »

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You could make sure by using an Ohmmeter between the contacts or even a simple battery and an lightbulb to check proper closing of the contacts, AND check the LED as well!

ALSO you could just exchange it for the other rear windscreen switch which is identical and test if your observation holds water.

If true, buy 2 new switches, they're equally old!

Good luuck,

Ray

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gozz
Senior Member

Been around awhile

Posts: 3475

Re: heated front screen 24v
« Reply #21 on: Mar 6^th, 2009, 11:31pm »

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python9.
The switches wont light up if the tiny bulb is bust,you need to test it on the bench with a meter or battery bulb and wire.
GOZZ.

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Highlander
Moderator
Expert

13 Scorpios, XR4x4, Suzuki SJ413 for off road :)

Posts: 8244

Re: heated front screen 24v
« Reply #22 on: Mar 6^th, 2009, 11:39pm »

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Will test the switch theory tomorrow, John's coming for a visit, theres a couple of spare switches kicking about here Wink

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on Oct 17^th, 2011, 12:35pm, Simmo wrote:

I give up ! Roll Eyes

Too much for an old boy! Huh

python9
Full Member

1997 24v ghia saloon

Posts: 241

Re: heated front screen 24v
« Reply #23 on: Mar 7^th, 2009, 12:15am »

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on Mar 6^th, 2009, 10:46pm, Cosray wrote:

That's good however the switch only takes that 12V (as a signal, no current/power whatsoever)) to the CCM which in turn activates the windscreen heater relay which supplies 12V power to the windscreen halves.

When the switch is properly wired and pushed does the orange LED inside the button come on?

That's proof that the CCM is correctly sending 12V to the LED and the relay. You can see the LED and hear the relay clicking.

The relay supplies the 12V to the two halves of the heated screen via its each two 30A fuses.

So if the switch is pressed AND the LED lights up AND the relay comes on you should be measuring 12V on both halves of the screen.

Make sure the Ground wires are well grounded.

Ray

no the orange led does not light up when i press the switch but it did before

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mindofitsown
Full Member

I'm a YaBB newbie!

Posts: 117

Re: heated front screen 24v
« Reply #24 on: Mar 11^th, 2009, 4:22pm »

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Has this problem been resolved since the last post (before this one)? I was following the thread with interest since only one half of my front screen heater works. Its been this way for a year or so (thus has nothing to do with a more recent thread I started regarding interior lights and BOTH screen heaters, now resolved). I've checked fuses 38 and 41 and these are fine. I presume that since only one relay is listed, it serves to provide power to two fuses which in turn serves each half of the windscreen. If I'm right, then the relay must be working otherwise both sides would be inoperative.
I'm confused about how the winscreen is connected. I can only see two connections and these are at the bottom corners (spade terminals). For the screen to operate in two halves, there must be a further connection for a common ground/common +ve supply (at least i.e. 3 wires in tota) so where is this other wire?

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