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From: BigNose on 2 Jan 2010 08:30
I have a Peugeot 306 with a built in heated rear windscreen.
I find that there is 4volts between the two spade connectors that
deliver the current when the are not connected to the rear window
tabs.
I connect one side and it still shows 4v present, then at the moment I
connect the other side the voltage drops to zero.

Is it cos there is not enough voltage in the first place and it just
gets swamped when the full windscreen circuit is connected?
Does it indicate that there is a short in the rear window and so the
power goes straight to ground?

Any guidance or suggested tests would be appreciated.
From: Thomas on 2 Jan 2010 08:39
BigNose wrote:
> I have a Peugeot 306 with a built in heated rear windscreen.
> I find that there is 4volts between the two spade connectors that
> deliver the current when the are not connected to the rear window
> tabs.
> I connect one side and it still shows 4v present, then at the moment I
> connect the other side the voltage drops to zero.
>
> Is it cos there is not enough voltage in the first place and it just
> gets swamped when the full windscreen circuit is connected?
> Does it indicate that there is a short in the rear window and so the
> power goes straight to ground?
>
> Any guidance or suggested tests would be appreciated.

If everything else is working ok I'd strongly suspect a dodgy connection
somewhere. It won't be a problem with the window heater itself.
From: steve robinson on 2 Jan 2010 08:39
BigNose wrote:

> I have a Peugeot 306 with a built in heated rear windscreen.
> I find that there is 4volts between the two spade connectors that
> deliver the current when the are not connected to the rear window
> tabs.
> I connect one side and it still shows 4v present, then at the
> moment I connect the other side the voltage drops to zero.
>
> Is it cos there is not enough voltage in the first place and it just
> gets swamped when the full windscreen circuit is connected?
> Does it indicate that there is a short in the rear window and so the
> power goes straight to ground?
>
> Any guidance or suggested tests would be appreciated.

No it should till show a voltage , the heated screen element is a
resisting material so its possible the voltage will drop (ohms law )

Can you test the current flowing through the circuit or test the
resistance of the window element or wether its got continuity

If you test in the millivolt range you may find a small voltage




From: Duncan Wood on 2 Jan 2010 08:42
On Sat, 02 Jan 2010 13:30:58 -0000, BigNose <bignose(a)stories.com> wrote:

> I have a Peugeot 306 with a built in heated rear windscreen.
> I find that there is 4volts between the two spade connectors that
> deliver the current when the are not connected to the rear window
> tabs.
> I connect one side and it still shows 4v present, then at the moment I
> connect the other side the voltage drops to zero.
>
> Is it cos there is not enough voltage in the first place and it just
> gets swamped when the full windscreen circuit is connected?
> Does it indicate that there is a short in the rear window and so the
> power goes straight to ground?
>
> Any guidance or suggested tests would be appreciated.

It's not the heater, it'll be either a corroded connector or the cable
that feeds it will have broken where it flexes.
From: BigNose on 2 Jan 2010 09:18
The only car I have to compare to is my daughters Matiz. It has 12V
running through it's HRW and a resistance of 2.1 Ohms.

Mine has about 6v (after flexing the wires to see if better contact
can be made) note further flexing does not incresase or decrease the
voltage - it appears fixed at 6v now. Again, it only appears at 6v
when one of the spades is not connected, once connected and in circuit
with the HRW it drops to zero - even when set on my lowest setting.

My resistance for the HRW is only 0.8 Ohms

Thanks to all for offering help.

Kev.
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