I'm trying to fit a new head unit to my friend's mark 1 punto. It's a CD player
made by "Shark" which I bought from Maplin. (it was on offer!)
When I first fitted the CD player, nothing happened, and I assumed it was dead.
But then I noticed that some other stuff had gone off too - interior light,
clock, etc., and traced the problem to a blown fuse.
Thinking it was just because I hadn't disconnected the battery when I fitted the
stereo, I replaced the fuse - and got my fingers burned when it popped again!
So I took it back out and got my multimeter out. It turns out that the power
connector in the car and the power connector on the head unit are differently
wired - notably the constant 12v supply, and the 12v supply from the key barrel
were the opposite way around. Also, there's a white "auto. ant." wire - which I
presume is for automatic antennae. I disconnected this, and swapped the other
When I fitted it again, same problem - blown fuse.
I've noticed that, on the new head unit, the speaker's ground is also the power
ground. I haven't investigated further to work out if this is the source of the
Before I go any further, is this a common problem which I can buy an adaptor for
or something? Anyone else had similar problems?
Cheers in advance!