Mk2 have only 1 earth (ground) to bulb but you need to split it in to two earths for mk2.5 bulbs.Then say, dip live and 1 earth to dip bulb and head live and earth to other bulb.

 

That is how it's set up at the moment. I have split the earth and both the full beam and low beam work individually. The issue I have is that the low beams on a mk2.5 are always on when the headlights are on whereas on a mk2 they switch off when the full beams are on. I want too keep the low beams on so I can run HIDs in them.

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the mk2.5 loom uses earths through the switches and the live are permanently to the bulbs (opposite of mk1 or mk2)I had similar issues when I fiited mk2.5 loom to my mk1. You will need relays on the earths ,as I did , to split/seperate the earths.Its not just case of dividing the earth wire itself.I had to fit 2relays , 1 for each side, as current was backfeeding to opposite lamp.You need auto electricain to do it properly

Also dont forget HID,s will fail NCT if not fitted from new to car.

 

I actually remember you telling me about that when I was getting an engine and box from ya. Ok I may stick on the thinking cap and come up with a wiring diagram. Cheers

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same issue here ..... but would the relays allow hid's to be used ? without the dimming issue ?

 

Anybody here use this baby?

http://www.miataroadster.com/mazda/mazda-dash-switches/mznc8366480/i-529320.aspx

 

It appears to have been done here: http://www.mx5nutz.com/forum/index.php?showtopic=357113

 

Rasc, you absolute legend. I still hadn't sorted this haha

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