12 Volt power supply
 

were selling are samlex power supply,
probably one of the best ones you'll find 13.8 volts 23amp had this for over 2 years never ever missed a beet £50 ono plus posted to uk

Model: SEC-1223
23 Amp Switching Power Supply


This high efficiency UL-60950-1 approved AC-DC power converter provides a highly regulated output DC voltage of 13.8 Volts at 23 Amps with an AC input of 120 Volts, 60 Hz (230 Volts, 50 Hz model also available). These advanced switch-mode DC power supplies were designed specifically for land mobile radio applications. The power supplies produce clean reliable power and are highly filtered to suppress RFI. The unit comes with a detachable power supply cord with NEMA 5-15P plug. Features include over-current, short-circuit and over-voltage protection. The AC-DC power supply conforms to FCC Part 15(B), class B digital device
Input100-130 VACOutput13.8 VDCAmps23 AmpsFuse6.3 AmpsWeight3.5 (lbs)Weight1.58 (kg)Dimensions8.19 x 7.28 x 2.4 (in)Dimensions20.8 x 18.5 x 6.1 (cm)SafetyUL, FCCWarranty3 Years
http://www.samlexamerica.com/documen...e/SEC-1223.jpg