As I'm sure a lot of you know the Alfa heated seat switches are a) rubbish and b) stupidly expensive to replace every other year.
Anyway after a 3rd one went in 18months I decided to look at a permanent fix/modification. Ive always owned Jap cars prior to the Alfa GT and know there generally very good at making quality switches/electronics. So I started looking for various switches of a similar size to the GT's. Eventually I found some Mazda RX8 switches that were cheap (around £15 pair off Ebay) and relatively small. The illumination and symbols are also the same as Alfa and the switches are rated at 20amp
I managed to get the looms as well to help with wiring.
Next task was to bell out the wiring for the Alfa and the RX8 switch. The RX8 switch has 5 wires as opposed to the Alfas 4. This is due to an extra earth which needs to be joined together. This is as follows:
RX8 ------ Alfa
Grey/Red ------ Red 1
Blue/White ------ Red 2
black & Red/Yellow (joined) ----- Grey
Red ------ Brown
So I unplugged the seat switch connector and pulled it out behind the seat.
Next cut off the connector and solder the RX8 loom to the Alfa wiring as described above. I used shrink sleeve and loom wrap to make a professional job
So with the straight forward job done, it was time to enlarge the holes in the seat plastic as the RX8 switches are larger
I achieved this with a coarse file, taking very small amounts off at a time. obviously there are other ways but this worked for me. Just remember if you do this, little at a time. You cant put it back on!!
Eventually it will drop in very snuggly and look like this:
Everything works perfectly as Alfa intended.
Only slight issue I have is that Mazda used bulbs in the switch and Alfa used Leds in theirs. This means that when the switch is feeding the heater elements in the seat (ie on) the yellow indicator light is a bit dull then brightens up when not. You could get round this by wiring in a diode or soldering leds to the bulb holders in the switch but it really doesn't bother me that much. They look standard, heat the seats and illuminate. All for a tenner and an hours time!