One fir the electrical bods

[silverfoxcc]

Have a 12v Halfords charger. what volttage would i expect to see on a tester when i connect the two outlet wires....

TIA

[200Plus Club]

If you mean across the battery terminals it will start at about 12.9v and then creep up probably to about 13.8v - 14.4v depending upon the charger and battery type
When you remove the charger the battery terminals will show above 13v initially then drop back to perhaps 12.6v-12.8v ideally if its nearly fully charged.

[spikeyhead]

What are you connecting the wires to?

[OldGermanHeaps]

Most new ones? Nothing until it senses a battery connected

[GreenV8S]

What sort of tester, connected how?

If you connect the two outlet wires to each other, that isn't going to show anything useful.

[Zad]

If it is an electronic "smart" charger, then they often refuse to start charging unless they detect a certain minimum voltage on the battery. This means that on a REALLY flat battery they will refuse to charge. The way around this is to briefly put a battery booster pack on and fool the charger into thinking it has 12V in the battery.