no matter what combination of connection l try of yellow lead, red lead it will not power up, but it works fine in a Fiat Idea and a Vauxhall VX220

try posting this question on fiatforum.co.uk sure one of the lads there can help you

on the Sony lead connection block change the yellow lead with the red. so you will need a pin to take the pins out of the block.
so you should now have the red in the yellow spot and the yellow spot now all you need to do is. on the yellow lead there will now be a connection on the end put the red and the yellow bullet connections in to the one yellow. that will then be a permanent live. but it will save radio stations and time.