I have a very old Peugeot 205. I've had a couple of stereos in it and
ocasionally they loose all the preset radio stations.

This is, I think, is becuase the stereo is loosing power. This happens,
sometimes, when I start the car. The engine turns over once. Stops.
Then, when I retry, it starts without a problem. I very rarely have any
problems starting the car. Just this slight hiccup now and again.

I was wondering if anyone had any suggestions as to how to track the
cause of this problem. It's a royal pain having to retune the radio once
a week.

Any thoughts?

Cheers, Dan