Prusa i3 heatbed wiring

My heatbed is not reaching the required temperature. It reaches around 52 C max. I have it wired to 24 V should I use the 12 V connection instead? I have measured the voltage across it when heating at 11.7 V and when printer switched off resistance about 5 ohm?

I have now got the heatbed reaching 100 C by connecting it via the 12 V connecter instead of 24 V but it will not go higher than this

If you are running a 12v power supply, wire the heater for 12v. Most PCB heaters can only get to 100c due to manufacturing discrepancies.

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Prusa i3 Rework - Ramps 1.4 - E3d Lite6 - Full Graphic LCD Controller

Get a 24V psu if your board supports it. It will heat much faster and reach higher than 130 degrees (I haven't tried higher, as it'll trip the safety threshold around 140 degrees I think). It's mandatory for ABS, nylon and HIPS if you use PVA glue. It doesn't adhere very well at lower temperatures than 105 degrees or so in my experience.