I have 2003 Volvo 660 truck. Turned the key on start position but no dashboard lights came on. Tried few times ,nothing happened. Checked the computer fuse by the batteries and tapped on the relays. Somehow the dash came to live and I started the truck. For the next 100 miles about every time I turn the turn signal on all the lights on the dash will come on for few seconds as if it's rebooting. Got home ,turned off the engine and haven't been able to start it again. No power to the dash and the key. Thinking of cleaning the batteries terminals and replacing the relays. Anybody has any suggestions?