Heated windscreen wiring

[Tris-m3]

This m3 rally car i bought has a heated windscreen fitted (with no wiring diagram) and a plastic rear windscreen so my plan is to simply move the bmw heated windscreen wiring from the back and plug it into the front...

Can anyone see anything wrong with doing this?

The only reason i ask is that the bmw has two little black boxes that wire into the rear winscreen so i am not sure if they are maybe transformers or something, i just don't want to risk blowing the elements in the windscreen......

[Tris-m3]

Anyone got any ideas on this??

[bruvs1]

i'd find out where the screen was bought from and consult them, heated screens arn't cheap so why blow it up! not worth guessing!!

[Tris-m3]

I just spoke to the manufactures and they said that a heated windscreen would fry rear heated windscreen wiring because it draws many more amps, good to know! thanks mate.

I think i will use the rear heated windscreen wiring to switch a 25 amp relay that will run the front windscreen, that way i get to keep the heated windscreen switch on the dashboard......

Do you think that will work ok?

[bruvs1]

it's either that or run a fresh feed in a better grade and have shorter wiring?