Hoping someone can help if they have had same issue, if my ignition is on but the engine is not my stereo works fine, as soon as i start the engine radio cuts off and resets. The wires are in the correct places before someone calls schoolboy error.

Ive had my multimeter on the supply lines and although battery holds a constant 12.4v when the engine is started it drops to 9.5v. Anyone got any ideas?

Nobody? Have i invented a whole new fault?

You mean it turns off and comes back on when you start up? I assume this is normal.

If ignition is on the stereo is on, soon as i start engine it loses power and resets. I measured voltage at battery doing same thing and its fine. So some where between battery and stereo power feed its dropping voltage.

This is normal, or at least my motor has always done it

If ignition is on the stereo is on, soon as i start engine it loses power and resets. I measured voltage at battery doing same thing and its fine. So some where between battery and stereo power feed its dropping voltage.

No, the car cuts power to the HU. You're seeing a feature as a fault.

Ok. There is a yellow and red wire from the skoda loom, yellow supplies 12v from ignition that turns stereo on and red supplies a constant 12v from battery for stereo memory. Correct?

Your talking about power been cut from the yellow one when the engine starts, im guessing so car always has power to start.

But the voltage also drops on the red wire which means not only does it restart but it wipes the memory.

I had multimeter on battery and that only drops to 10.5v when engine started then goes up past 14v.

So the constant voltage wire for the stereo should also only drop to 10.5v?

So somewhere between battery and the stereo feed i am losing 1v.

oh youre losing memory? Non-Standard head unit? Swap the yellow and red around.

Yellow and red is swapped its the red thats losing power.

From another forum.

"Normally the yellow wire is your constant (never goes off) 12v source (usually a straight run from the battery with a fuse somewhere in between).

The red wire is normally your "Key On" which means then the key is in the off position (or just plain out) the red wire doesn't recieve any power. When the key is on (or in the start position) the red wire gets a 12v signal.

Yellow wire= memory

Red wire = turn on"

So your yellow is plugged into red on the stereo, and red from car into yellow? Sorry just from this it sounds like you have it the other way. "Ok. There is a yellow and red wire from the skoda loom, yellow supplies 12v from ignition that turns stereo on and red supplies a constant 12v from battery for stereo memory. Correct?"

Two days before you actually tell us it's loosing the pre-set's?! You really are making this harder than it needs to be.

What HU are you using and what pins are the red and yellow cables on respectively?

I seem to have complicated it all. Basically all the wires are going to where they need to be on the stereo. I have double checked by measuring the voltages from the skoda loom and matching them to wiring diagram for stereo.

If i start the car straight up the stereo is fine, if i turn ignition on the stereo is fine. Its when i go from having ignition to starting the engine that the constant supply drops to 9.5v and the stereo loses all its pre-sets.