Steph

The indicator relay went on my car so i had it replaced and since the new one has been fitted my abs light comes on when I brake, the headlight light on the dash comes on when I brake if I have my lights on the brake lights are on all the time and my glow plug light is flashing. Could it be the relay that's causing the problem or is it a wiring problem? I didn't have any problems before the relay was changed. The car has just been serviced and passed it's mot