I bought 2009 i10 with 69000km, 1200 high spec, got it on monday in pta, drove to springs, while driving at speed 120, and also 80, the ABS, airbag and eps lights came on one by one, and the radio went in a mute state, could hardly hear it, but it came right in a few minutes, but does it again a bit later, also, the temp gauge needle jumps up and down with times, go up into the red, but a bit later it shows normal again, ???

Check the earth wire from the battery there maybe a fault with the electrics. check the earthing points and connection to the battery.clean earthing points and connections. electric faults could be anything but these are the most common things to check. also if you have a meter check the battery check its volts before starting engine and check after the battery that is fully charged should read 12.04 or a bit higher. and with engine running it should be 14.00 volts can be higher by a bit. if the battery is fully charged and lower than 12 volts it has a problem if the charging from the engine is lower the 14v then they could be a problem with the alternator. if you have a drop out while driving parts of the system will drop as the voltage has dropped below it working rate. abs is 11 volts or lower will cut this out and say its not working and so on with other devices.