You might be able to re attach it with araldite, and then use the HRW amplifier repair paint to make a ne 'track' to the damaged terminal, but TBH you're probably stuffed mate.

DD

 

Are both ends of the wire still visible? Should be solderable if the wire is copper. If not then conductive paint may work.

 

To me it looks like it was soldered on!

There's gotta be a way to fix it - I can't just be "stuffed" else that's a pretty crappy design flaw that you can't repair it.

 

Both ends of what wire?

I have a flat metal terminal covered in solder, and then on the glass there is the large square patch right at the edge, which has very little solder on it.

 

1st of all it's a flaw that is on every car with a HRW.

anyway the only way is the araldite and HRW paint. do not try to solder, the hot spot on the glass could cause it to shatter.....

 

So how did they attach it in the first place? Because I'm 90% sure that's solder on there at the moment.

 

Both ends of what wire?

I have a flat metal terminal covered in solder, and then on the glass there is the large square patch right at the edge, which has very little solder on it.

That's what I meant. If you can still see both ends of the connector then it should be solderable.
I've done a fair bit of electrical work in my time, so I'll give some advice how to do it.
First of all put a little soldering flux on whats left of the broken terminal on the glass then coat it in solder with a soldering iron. Then get a few strands of copper wire twisted together and coat that in solder too. Put a tiny bit of flux on the copper wire then mate it with what's left of the terminal on the glass and solder it.
Position the connector close to the broken terminal on the glass and attach it somehow with double sided tape or whatever.
Coat the connector in solder as before then bridge the gap with the copper wire and solder the two together.

 

So how did they attach it in the first place? Because I'm 90% sure that's solder on there at the moment.

yes it was soldered, but was done whilst glass was warm, result no hot spot.

Ashy's method works, but be very careful... I've had glass go on me when trying to solder it, and the bang is fcuking loud!

 

i'm sure you can buy conductive paint designed for rear heater elements, in halfords...

 

yea you can

 

So how did they attach it in the first place? Because I'm 90% sure that's solder on there at the moment.

It's all pre assembled and then 'printed' on in one hit.

DD