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Ah not to be an alarmist, but get it seen too quick. Recalls an incidence where the from engine to main earth lead to body earth was not connected and the Disco2 earthed itself via the handbrake cable, which then got red hot and fried the main engine ECU.
If its a D2 and it sounds like it cause I had the same problems. Dim lights, radio turning off, temp gauge going to cold ( like it was a blown hose and no water), hot hand brake. I found that most of my problems went away with the following two points. Disconnect the battery first.
1. Take off all of the connections on the earth bar just behind the ECU ( drivers side) and give them a good clean as well as the bar itself. From memory there is a link from the battery to this earth bar. I did this 2nd up and found my lights were brighter after, didn't realize I had a problem with the lights before this.
2. There are a couple of earth points behind the air filter box, clean these as well, you will have to take out the filter box. I did these first and they changed my initial radio problem.
From memory there were also a couple on the passenger side firewall inside the engine bay, but these didn't change any of my problems. Apologies for the vagueness as my god-fairy changed my disco into a 12 Defender.
Cheers Glen